3COM Dual 56K User Manual

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Dual 56K LAN Modem

User Guide

MODEL NO. 3C888

Part No. 1.018.1752 Published May 2000

http://www.3com.com/

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3Com Corporation 5400 Bayfront Plaza Santa Clara, California 95052-8145

Copyright © 3Com Corporation, 2000. All rights reserved. No part of this documentation may be reproduced in any form or by any means or used to make any derivative work (such as translation, transformation, or adaptation) without permission from 3Com Corporation.

3Com Corporation reserves the right to revise this documentation and to make changes in content from time to time without obligation on the part of 3Com Corporation to provide notiﬁcation of such revision or change.

3Com Corporation provides this documentation without warranty of any kind, either implied or expressed, including, but not limited to, the implied warranties of merchantability and ﬁtness for a particular purpose. 3Com may make improvements or changes in the product(s) and/or the program(s) described in this documentation at any time.

UNITED STATES GOVERNMENT LEGENDS:

If you are a United States government agency, then this documentation and the software described herein are provided to you subject to the following restricted rights:

For units of the Department of Defense:

Restricted Rights Legend: Use, duplication, or disclosure by the Government is subject to restrictions as set

forth in subparagraph (c) (1) (ii) for Restricted Rights in Technical Data and Computer Software Clause at 48 C.F.R. 52.227-7013. 3Com Corporation, 5400 Bayfront Plaza, Santa Clara, California 95052-8145.

For civilian agencies:

Restricted Rights Legend: Use, reproduction, or disclosure is subject to restrictions set forth in subparagraph

(a) through (d) of the Commercial Computer Software - Restricted Rights Clause at 48 C.F.R. 52.227-19 and the limitations set forth in 3Com Corporation’s standard commercial agreement for the software. Unpublished rights reserved under the copyright laws of the United States.

Unless otherwise indicated, 3Com registered trademarks are registered in the United States and may or may not be registered in other countries.

3Com, OfﬁceConnect, and U.S. Robotics are registered trademarks of 3Com Corporation. 3ComFacts is a service mark of 3Com.

Acrobat and Adobe are registered trademarks of Adobe Systems, Incorporated. America Online is a registered trademark of America Online, Inc. Macintosh is a registered trademark of Apple Computer. Compuserve is a registered trademark of Compuserve Interactive Services, Inc. LZS is a registered trademarks of hi/fn, Inc. Pentium is a registered trademark of Intel Corporation. IBM is a trademark of International Business Machines Corporation. Windows and Windows NT are registered trademarks of Microsoft Corporation. Netscape Navigator is a registered trademark of Netscape Communications. IPX is a registered trademark of Novell, Inc. UL is a trademark of Underwriters Laboratory, Inc.

Other brand and product names may be registered trademarks or trademarks of their respective holders.

Guide written by Eric Heller.

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Important Safety Information

MPORTANT

WARNING: Warnings contain directions that you must follow for your personal safety. Follow all

instructions carefully.

Please read the following information carefully and thoroughly before installing the unit:

Take exceptional care during the installation and removal of the unit.

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Locate the unit close to the mains socket outlet, and ensure that the mains socket is accessible.

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Use the power adapter supplied with the unit to ensure compliance with national and

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international safety standards. If there is no power adapter supplied, the mains cordset used must be compliant with the local and national regulations of the target country and must not violate the safety approval of the product (refer to the Approvals section at the back of this manual).

Disconnect the power adapter before moving the unit. Power can only be disconnected from the

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unit by removing the power adapter from the unit or from the socket outlet. Only connect apparatus complying with the relevant interface requirements to the ports on this

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unit. The safety status of the ports on this equipment are as follows.

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Ports identiﬁed by the labels LAN and Phone = SELV. SELV (Safety Extra Low Voltage) is a secondary circuit which is designed and protected so that under normal and single-fault conditions, the voltage between any two accessible parts does not exceed a safe value (42.2 V peak or 60 V DC).

There are no user-replaceable fuses or user-serviceable parts inside the unit. If there is a physical

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problem with the unit that cannot be solved with problem solving actions in this guide, contact the 3Com reseller from whom the equipment was purchased.

If the units are stackable, only stack similar units.

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AFETY

NFORMATION

Wichtige Sicherheits-Informatio nen

WARNING: Twisted Pair RJ45 data ports. These are shielded RJ45 data sockets. They cannot be

used as telephone sockets. Only connect RJ45 data connectors to these ports.

WARNUNG: Warnungen enthalten Anweisungen, die Sie zu Ihrer persönlichen Sicherheit befolgen

müssen. Bitte halten Sie sich daran.

Bitte lesen Sie die folgenden Informationen aufmerksam, ehe Sie die Einheit installieren:

Lassen Sie bei Installation und Abbau besondere Vorsicht walten.

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Stellen Sie die Einheit in der Nähe einer Stromquelle auf und achten Sie darauf, daß diese

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zugänglich ist. Verwenden Sie immer den mitgelieferten Netzadapter, damit die Einhaltung nationaler und

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internationaler Sicherheitsnormen gewährleistet ist. Wurde kein Adapter mitgeliefert, muß das verwendete Netzkabel den lokalen und nationalen Bestimmungen des Landes entsprechen und darf die Sicherheitsbestimmungen des Produkts (siehe den entsprechenden Abschnitt am Ende dieses Handbuchs) nicht verletzen.

Trennen Sie den Netzadapter von der Stromversorgung, bevor Sie die Einheit bewegen. Die

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Einheit kann nur von der Stromversorgung getrennt werden, indem Sie die Verbindung des Netzadapters entweder von Einheit oder der Stromquelle trennen.

Schließen Sie nur Geräte an den Schnittstellen dieser Einheit an, die den

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Interface-Voraussetzungen entsprechen. Die Sicherheitsmerkmale der Schnittstellen dieses Geräts sind:

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Schnittstellen mit der Bezeichnung LAN und Phone = SELV. SELV (Safety Extra Low Voltage) ist ein sekundärer Schaltkreis, der unter normalen und Single-Fault-Bedingungen so eingerichtet

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ist, daß die Spannung zwischen zwei zugänglichen Bauteilen einen Sicherheitswert nicht übersteigt (42,2 V Spitzenspannung bzw. 60 V Gleichspannung).

Die Einheit enthält keine Sicherungen oder sonstige Bauteile, die vom Benutzer ausgewechselt

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oder gewartet werden können. Sollte ein physikalischer Fehler auftreten, der mit den in diesem Handbuch beschriebenen Maßnahmen nicht zu beheben ist, setzen Sie sich mit dem 3Com-Vertreter in Verbindung, bei dem Sie das Gerät erworben haben.

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Bei stapelfähiger Konstruktion nur gleichartige Einheiten verwenden.

WARNUNG: Twisted Pair RJ45-Datenschnittstellen. Dies sind abgeschirmte RJ45-Schnittstellen,

die nicht für Telefonsignale verwendet werden können. Schließen Sie an diesen Schnittstellen nur RJ45-Datenstecker an.

Important Notice de Securite

AVERTISSEMENT: les avertissements présentent des instructions que vous devez suivre très

attentivement pour votre sécurité personnelle.

Veuillez lire les informations suivantes attentivement avant l'installation de l'appareil.

Soyez très prudents pendant toute la durée de l'installation et du déplacement de l'appareil.

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Placez l'appareil près d'une prise murale qui doit rester accessible à tout instant.

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Utilisez l'adaptateur électrique fourni avec l'appareil pour garantir la conformité totale aux normes de sécurité nationales et internationales. Si aucun adaptateur n'est fourni, le câble électrique utilisé doit être conforme aux normes locales et nationales du pays et ne doit en aucun cas contrevenir aux normes de sécurité d'utilisation de l'appareil (veuillez consulter la section Approvals (Agréments) au dos du présent manuel).

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Déconnectez l'adaptateur électrique avant de déplacer l'appareil. L'alimentation ne peut être déconnectée de l'appareil qu'en retirant l'adaptateur de l'appareil ou de la prise de courant.

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Ne connectez l'appareil qu'en conformité avec les exigences techniques des ports de connexion de l'appareil. Les normes de sécurité de chaque port sont les suivantes :

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Les ports identiﬁés par les étiquettes LAN et Phone = SELV. Les circuits SELV (Safety Extra Low Voltage, très basse tension de sécurité) sont des circuits secondaires qui sont conçus et protégés pour qu'en conditions normales et à défaillance unique, la tension n'excède jamais la valeur de sécurité de 42,2 V en crête, ou 60 V DC.

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L'appareil ne contient aucun fusible remplaçable par l'utilisateur ni aucune pièce dont la maintenance peut être effectuée par l'utilisateur. Si un problème physique survient dans l'appareil, qui ne peut être résolu au moyen des techniques de dépannage du présent manuel, contactez le revendeur 3Com qui vous a fourni l'appareil.

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Si vous disposez de plusieurs appareils empilables sur racks, n'empilez que les appareils similaires.

AVERTISSEMENT: ports de données RJ45 à paires torsadées. Il s'agit de prises de données RJ45

blindées. Elles ne peuvent être utilisées comme prises de téléphone. Elles ne doivent recevoir que les connecteurs de données RJ45.

Medidas de Seguridad Importantes

ADVERTENCIA: las advertencias contienen instrucciones que es preciso seguir al pie de la letra para

evitar daños personales.

Antes de instalar la unidad, lea atentamente la siguiente información.

Tome todas las precauciones necesarias a la hora de instalar o desinstalar la unidad.

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Coloque la unidad cerca de una toma de corriente de fácil acceso.

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Utilice el adaptador de corriente suministrado con la unidad, de este modo se asegura el pleno cumplimiento de las normas de seguridad nacionales e internacionales. En caso de no recibir un adaptador con la unidad, deberá utilizar un cable que responda a los requisitos estipulados por la normativa local o nacional pertinente y que no contravenga la garantía de seguridad del producto (consulte la sección relativa a este punto al final de esta guía).

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Desenchufe el adaptador antes de mover la unidad. La única forma de interrumpir el paso de corriente consiste en desenchufar el adaptador de la unidad o de la toma de corriente.

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No deben conectarse a los puertos de la unidad aparatos que no cumplan los requisitos de la interfaz en uso. Los puertos de la unidad son de los siguientes tipos:

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Puertos con etiqueta LAN o Phone= SELV. SELV (Safety Extra Low Voltage) es un circuito secundario diseñado para que el voltaje entre dos puntos accesibles no exceda límites seguros (42,2 V punta ó 60 V CC) en circunstancias normales o de fallo simple.

La unidad no contiene fusibles ni otros componentes que el usuario pueda cambiar o reparar. De

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producirse problemas cuya resolución no se explique en esta guía, póngase en contacto con el proveedor de 3Com.

Si las unidades que posee son apilables, acople las que sean similares entre sí.

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ADVERTENCIA: puertos de datos de par trenzado RJ45. Son enchufes blindados RJ45 a los que

sólo deben acoplarse conectores de datos RJ45. No pueden utilizarse como enchufes telefónicos.

Informazioni Importanti per la Sicurezza

AVVERTENZA: il testo delle avvertenze riporta importanti istruzioni alle quali occorre attenersi per

motivi di sicurezza. Seguire attentamente tutte le istruzioni.

Prima di installare l'unità, leggere attentamente le informazioni riportate di seguito.

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Procedere con estrema cautela durante l'installazione e la rimozione dell'unità.

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Collocare l'unità vicino a una presa di corrente e verificare che la presa sia accessibile. Per garantire la conformità alle norme di sicurezza nazionali e internazionali, usare l'adattatore di

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corrente fornito con l'unità. Se l'adattatore non è compreso, il cavo alimentatore deve essere conforme alle norme locali e nazionali del paese di destinazione nonché all'omologazione di sicurezza del prodotto (per ulteriori informazioni consultare la sezione relativa alle omologazioni riportata alla ﬁne del manuale).

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Scollegare l'adattatore prima di spostare l'unità. Per scollegare l'unità occorre rimuovere l'adattatore dall'unità stessa o dalla presa di corrente.

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Collegare alle porte dell'unità solamente apparecchi conformi ai requisiti della relativa interfaccia. Le speciﬁche riguardanti la sicurezza delle porte sono le seguenti:

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Porte contrassegnate dalle targhette LAN e Phone = SELV. SELV (Safety Extra Low Voltage) è un circuito secondario ideato e protetto in modo tale che, in condizioni normali e in caso di un unico guasto, la tensione tra due parti accessibili qualsiasi non superi il valore di sicurezza (42,2 V picco o 60 V CC).

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All'interno dell'unità non vi sono fusibili sostituibili dall'utente o parti la cui manutenzione può essere effettuata dall'utente. Se si verifica un problema che non si è in grado di risolvere seguendo le istruzioni per la risoluzione dei problemi riportate nel presente manuale, contattare il rivenditore 3Com presso il quale si è acquistata l'unità.

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Se le unità sono impilabili, impilare solamente unità simili.

AVVERTENZA: porte dati RJ45 per doppino intrecciato. Si tratta di prese dati RJ45 schermate e

non possono essere utilizzate come prese telefoniche. Collegare solamente connettori dati RJ45 a queste porte.

Additional Safety Information

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Only connect apparatus complying with the relevant interface requirements to the ports on this unit.

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Disconnect the power adapter before moving the unit. Retain this user’s guide for later use and pass it on in the event of change of ownership of

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the unit.

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Protect the unit from sudden, transient increases and decreases in electrical power by ﬁtting an in-line surge suppressor or uninterruptible power supply. Products manufactured by us are safe and without risk provided they are installed, used and maintained in good working order in accordance with our instructions and recommendations.

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If any of the following conditions occur, isolate the electricity supply and refer to your 3Com reseller.

If the case or cover is not correctly ﬁtted or if it is damaged.

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If the unit begins to make an odd noise, smell or smoke.

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If the unit shows signs of a distinct change in performance.

Never install telephone wires during a lightning storm, or install telephone connection

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sockets in wet locations, unless the socket is speciﬁcally designed for wet locations. Do not touch uninstalled telephone wires or terminals unless the telephone line has been

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disconnected at the network interface. Always exercise caution when installing or modifying telephone lines.

Do not use a telephone, which is connected to the unit, to report a gas leak in the vicinity of

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the leak. Do not spill food or liquids on the unit. If the unit gets wet, isolate the electrical supply and

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contact your 3Com reseller.

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Do not push any objects into the openings of the unit. Doing so can cause ﬁre or electric shock by shorting out internal components.

Only equipment approved for use by your telecom company can be connected to the

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telephone port.

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Avoid using a telephone, which is connected to the unit (other than a cordless type), during an electrical storm.

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Equipment connected to the telephone port must be located in the same building as the unit.

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Be sure nothing rests on the units system cables and that the cables are not located where they can be stepped on and cause damage to the unit.

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Keep the unit away from radiators and heat sources. Allow 25mm (1inch) around the unit to provide adequate air circulation.

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Install the unit in a clean area that is free from dust or extreme temperatures.

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Allow a clearance gap of at least a 150 mm (6 inches) from the rear panel of the unit, to allow for cable access.

Interconnecting directly, or by way of other apparatus, to ports complying with SELV

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requirements may produce hazardous conditions on the network. Advice should be sought from a competent engineer before such a connection is made.

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ABLE

MPORTANT

Wichtige Sicherheits-Informationen 3 Important Notice de Securite 4 Medidas de Seguridad Importantes 4 Informazioni Importanti per la Sicurezza 5 Additional Safety Information 5

BOUT

Introduction 11 How to Use This Guide 11 Conventions 12 Year 2000 Compliance 12

HIS

AFETY

UIDE

ONTENTS

NFORMATION

NTRODUCTION

Introduction 13 Applications 14 Hardware Description 16 Features 18

UAL

56K LAN M

UNCTIONALITY

LAN Side Connectivity: Installing an Ethernet Hub 21 Wan Side: The Two 56K Modems 22 Using the Modem Channels 22 Dial-in Functionality 25 Understanding Multilink PPP and Other Line Usage Options 27 The Virtual FAX Modem (Windows 95, 98, NT, and 2000) 28 Support for Virtual Private Networks (VPNs) 29

EFORE

Package Contents 31 Before You Begin 31 Why Check TCP/IP and IP Address Settings? 32 Checking TCP/IP and IP Address Settings 32 Adding TCP/IP to Your Protocols List 34

ODEM

ESCRIPTION

EGIN

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Setting Up Your Computer If You Have a Static IP Address 39

INSTALLING THE DUAL 56K LAN MODEM

Before You Start the Installation 43

CONFIGURING THE DUAL 56K LAN MODEM FOR INTERNET ACCESS

Typical Conﬁguration 47 Changing the LAN Modem IP Address for Static IP Users 52 The LAN Modem Main Conﬁguration Page 53 Connecting an External Hub to the Dual 56K LAN Modem 56

CONFIGURING THE DUAL 56K LAN MODEM FOR PRIVATE NETWORK A

CCESS

Before You Start the Conﬁguration 59 Conﬁguration Steps 60 Changing the LAN Modem IP Address for Static IP Users 67 The LAN Modem Main Conﬁguration Page 68 The LAN Modem Support Web Site 70

ADVANCED CONFIGURATION

Advanced Conﬁguration 71 Conﬁguring Additional Service Providers 71 Editing Service Provider Proﬁles 76 Associating Service Providers with Workstations on the LAN 76 Using a Connection Script 77 Conﬁguring LAN Parameters 81 Conﬁguring V.90 Modem Control Parameters 83 Changing Data Call Parameters 85 Specifying a WINS Server Address 87 Conﬁguring the Local DNS Table 88 Reserving DHCP Addresses 89 Changing Your Password 89 Locking and Unlocking the Conﬁguration 90 Using Selective Password Protection 91 Conﬁguring the LAN Modem from a Remote Location 91 Checking for Dual 56K LAN Modem upgrades 94

CONFIGURING THE DUAL 56K LAN MODEM FOR DIAL-IN SUPPORT

Understanding Dial-in Basics 95 Understanding the Three Dial-in Proﬁle Types 96 Part I. Conﬁguring the Server-side Dual 56K LAN Modem for Dial-in Support 99 Part II. Conﬁguring a Client Device for Dial-out Access 109 Conﬁguring Dial-in User Parameters 114

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Placing a Call from a Client-side LAN Modem 118

PLACING, RECEIVING AND DISCONNECTING CALLS

Using the LAN Modem Desktop Manager (Windows only) 119 Placing Calls 119 Receiving Calls 121 Disconnecting Calls 122

TROUBLESHOOTING AND MAINTENANCE

Checking the Basics 125 Monitoring LEDs 125 Evaluating Symptoms and Solutions 126 Finding More Information 131 Contacting Technical Support 131 Downloading Firmware to Your Dual 56K LAN Modem 131 Resetting the Dual 56K LAN Modem 131 Reviewing Statistics 132 Synchronizing the LAN Modem Clock 134

NETWORKING PRIMER

What is a network? 137

INSTALLING AND USING THE VIRTUAL FAX MODEM

Installing the Virtual FAX Modem 147

CREATING A VIRTUAL PRIVATE NETWORK (VPN) TUNNEL

Creating a Virtual Private Network (VPN) Tunnel 151

FACTORY DEFAULTS

Dual 56K LAN Modem Factory Defaults 153

SPECIFICATIONS

Speciﬁcations 155 Year 2000 Compliance 155

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GLOSSARY

3COM CORPORATION LIMITED LIFETIME WARRANTY

REGULATORY AND APROVAL INFORMATION

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ABOUT THIS GUIDE

About This Guide provides an overview of this User Guide, describes guide conventions, and shows you where to look for speciﬁc information.

Introduction This guide tells you how to install and conﬁgure the Dual 56K LAN Modem and

provides descriptions of key applications and networking concepts.

Audience Description This guide is intended for end users with no presumed level of expertise.

How to Use This Guide

Table 1 shows you where to ﬁnd speciﬁc information in this guide.

Table 1 Speciﬁc Information

If you are looking for... Turn to...

An overview of the Dual 56K LAN Modem Chapter 1 A description of the Dual 56K LAN Modem hardware components Chapter 1 An explanation of the Dual 56K LAN Modem’s key functionality Chapter 2 Instructions on checking TCP/IP and IP address settings Chapter 3 Instructions on installing the Dual 56K LAN Modem Chapter 4 Instructions on configuring the Dual 56K LAN Modem for Internet access Chapter 5 Instructions on configuring the Dual 56K LAN Modem for private network access Chapter 6 Instructions on advanced configuration of the Dual 56K LAN Modem Chapter 7 Instructions on configuring the Dual 56K LAN Modem for dial-in support Chapter 8 Information on placing and disconnecting calls and using the Desktop Manager Chapter 9 Information on troubleshooting and maintenance Chapter 10 Background information on networking Appendix A Information on installing and using the Virtual FAX Modem application Appendix B Information on creating a virtual private network (VPN) tunnel Appendix C Dual 56K LAN Modem factory default settings Appendix D Technical specifications for the Dual 56K LAN Modem Appendix E Glossary definitions for terms used in this guide Glossary

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12 ABOUT THIS GUIDE

Conventions Table 2 and Table 3 list conventions that are used throughout this guide.

Table 2 Notice Icons

Icon Notice Type Alerts you to...

Information note Important features or instructions

Caution Risk of personal safety, system damage, or loss of data

Warning Risk of severe personal injury

Table 3 Text Conventions

Convention Description

Commands The word “command” means you must enter the command exactly as

The words “enter” and “type”

[Key] names Key names appear in text in one of two ways:

Menu commands and buttons

Words in italicized type

Words in bold-face type

shown in text and press the Return or Enter key. Example:

To remove the IP address, enter the following command:

SETDefault!0 -IP NETaddr = 0.0.0.0

NOTE: This guide always gives the full form of a command in

uppercase and lowercase letters. However, you can abbreviate commands by entering only the uppercase letters and the appropriate value. Commands are not case-sensitive.

When you see the word “enter” in this guide, you must type something and then press the Return or Enter key. Do not press the Return or Enter key when an instruction simply says “type.”

■ Referred to by their labels, such as “the Return key” or “the Escape

key”

■ Written with brackets, such as [Return] or [Esc].

If you must press two or more keys simultaneously, the key names are linked with a plus sign (+). Example:

Press [Ctrl]+[Alt]+[Del].

Menu commands or button names appear in italics. Example:

From the Help menu, select Contents.

Italics emphasize a point or denote new terms at the place where they are defined in the text.

Bold text denotes key features.

Year 2000 Compliance The OfﬁceConnect LAN Modem is Year 2000 compliant. Speciﬁcally, its system

clock is capable of accepting and storing dates including and beyond the year

2000. For information on Year 2000 compliance and 3Com products, visit the 3Com Year 2000 web page:

http://www.3com.com/products/yr2000.html.

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INTRODUCTION

This chapter provides an overview of the OfﬁceConnect® Dual 56K LAN Modem, referred to throughout this document as the Dual 56K LAN Modem, or simply as the LAN Modem.

Introduction The Dual 56K LAN Modem is an easy-to-install, Local Area Network (LAN) to Wide

Area Network (WAN), analog IP router. The LAN Modem provides four 10BASE-T Ethernet ports for LAN-side connections and two internal, V.90 ITU 56K-standard modems for WAN-side connections, plus two additional analog ports for standard analog equipment such as a phone and/or fax machine.

To conﬁgure the Dual 56K LAN Modem, you use a standard web browser on a computer attached to the LAN Modem to access the LAN Modem’s web-based conﬁguration screens. Afterwards, you can attach up to three additional computers directly to the LAN Modem, or a combination of external hubs and computers, to create WAN access for up to 25 users.

Dial-in and Dial-out

Access

Dual 56K Analog

Modems

The Dual 56K LAN Modem supports both dial-in and dial-out remote access. This means that you can use the LAN Modem on either end of a LAN-to-WAN connection: to call out from your local LAN to an already existing network (such as the Internet or a private, corporate network), or to receive calls into your LAN from up to ten previously-deﬁned remote sites. For calls to a private network via the Internet, where security is a consideration, the LAN Modem also supports pass-though VPN (Virtual Private Network) tunneling.

The V.90 56K ITU standard used on each of the Dual 56K’s internal modems provides download speeds of up to 56K can be accessed independently on a ﬁrst-come, ﬁrst-served basis by any combination of users dialing out from the LAN and users dialing in to the LAN for separate, 56K connections. Or, the LAN Modem can be conﬁgured to provide one high-speed connection at a time.

The Dual 56K LAN Modem is software upgradeable, allowing for easy upgrades to new features and enhancements as they become available. Visit the LAN Modem Web site for the latest ﬁrmware releases: http://www.3com.com/support/docs/lanmodem.

1.Capable of receiving downloads at up to 56 Kbps and sending at up to 31.2 Kbps. Due to FCC regulations, receiving speeds are limited to 53 Kbps. Actual speeds may vary. Requires compatible analog phone line and server equipment. The Dual 56K LAN Modem complies with the V.90 ITU standard and is backwards-compatible with all US Robotics 56K standards. Standard ofﬁcially determined in February, 1998; ratiﬁed in September, 1998.

for each analog line. The two modems

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14 CHAPTER 1: INTRODUCTION

Applications The primary applications for the Dual 56K LAN Modem are:

■ Local networking with shared, dial-out access to the Internet

■ Local networking with shared, dial-out access to a private network, such as a

remote corporate ofﬁce LAN (this can include indirect Internet access through the private network’s Internet connection)

■ Local networking with shared, simultaneous dial-out access to the Internet and

a private network

■ Combined dial-in and dial-out access for several possible networking scenarios

(refer to Chapter 8 for speciﬁc dial-in applications).

The following diagrams illustrate the primary Dual 56K LAN Modem applications:

Local Networking with Shared Internet Access

Local Networking with

Shared Private Network

Access

Users can share access to the Internet while they continue to network locally, as shown in Figure 1.

OfficeConnect Dual 56K LAN Modem

r A

LAN StatusMODEM 2MODEM 1

OfficeConnect Dual 56k LAN Modem

Public telephone

network

Internet

Two analog POTs lines

Figure 1 Local Networking with Shared Internet Access

Users can share access to a remote private network, such as a corporate ofﬁce LAN, while they continue to network locally. This can include indirect access to the Internet through the private network’s Internet connection, as shown in Figure 2.

OfficeConnect Dual 56K LAN Modem

LAN StatusMODEM 2MODEM 1

OfficeConnect Dual 56k LAN Modem

Two analog POTS lines

Public telephone

network

Private network

Figure 2 Local Networking with Remote Private Network Access

ted

Internet

 onnec c More

m o C

3 E L

O S N O C

N K C A T S 0 0 5 1 m

e t s y

s e c c A e t

m e R R

E X

P T N U A S K

W L

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r e

T w o

X P

s U

N D

t D

S S I I R B 4 3 4 / 3 D 2 / 1 2 T O

2 L 1 S

4 G O L A N A

1 1 T O L S 2

Dedicated or leased line connection

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Applications 15

OfficeConnect Dual 56K LAN Modem

Public telephone

network

Two analog POTs lines

Dial-in modem user

Server

Workstation

Internet

private network

OfficeConnect Dual 56k LAN Modem

LAN StatusMODEM 2MODEM 1

Local Networking with

Shared Access to the

Internet and a Private

Network

Users can share simultaneous access to both the Internet and a remote private network while they continue to network locally, as shown in Figure 3.

Internet

OfficeConnect Dual 56K LAN Modem

LAN StatusMODEM 2MODEM 1

OfficeConnect Dual 56k LAN Modem

Two analog POTS lines

Figure 3 Local Networking with Shared Access to the Internet and a Remote Private Network

Public telephone

network

ted



ec n n

co e r o M

o C

3 E L O S N O

T E N K C A T

S 0 0 5 1

m e t s y

N S

A s

L s e c c A e t

R m e R R

T N

W L

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A T w S

o X P t

R e s e R

u t a

S S I I R B 4 3 4 / 3 D 2 / 1 2 T O

2 L 1 S

4 G O L A N A 3

1 T O L S

Private network

Combined Dial-in and

Dial-out Access

Users can share access to the Internet or a remote private network and continue to network locally, while a user dials in for access to a server or servers on the LAN, as shown in Figure 4. (Other dial-in scenarios are possible. Refer to Chapter 8 for speciﬁc applications.)

Figure 4 Local Networking and Dial-out Access with Dial-in Support

Page 16

16 CHAPTER 1: INTRODUCTION

Hardware Description The following is an overview of the Dual 56K LAN Modem hardware, including the

function of the front panel LEDs and back panel connectors.

Front Panel LED

Description

The front panel contains the LEDs illustrated in Figure 5.

essage

Alert

Pow

Figure 5 Dual 56K LAN Modem Front Panel

LAN StatusMODEM 2MODEM 1

COLL

OfficeConnect Dual 56k LAN Modem

The functions of the front panel LEDs are described in Table 4. These front panel LEDs indicate proper operation and display analog modem and Ethernet port activity status.

Table 4 Front Panel LED Indicator Deﬁnitions

LED Color Description

Alert Amber Operational Status. Lit during power-on self-diagnostic test

Power Green Power Indicator. Remains lit as long as power is supplied to

Message Not implemented. AA (MODEM 1 or 2) Green Auto Answer. Shows the answer status for Modem 1 or 2,

CD (MODEM 1 or 2) Green Carrier Detect. Remains lit for the indicated modem if the

RD (MODEM 1 or 2) Green Received Data. Flashes when the indicated modem receives

SD (MODEM 1 or 2) Green Send Data. Flashes when the indicated modem sends data to

OH (MODEM 1 or 2) Green Off Hook. Remains lit when the indicated modem has gone

TX Green Ethernet Transmit Status. Flashes green when data is being

or after pressing the reset button. Off indicates that the unit has passed the diagnostic test and

is working properly. Flashes if one or more of the diagnostics have failed or after

the unit is placed in firmware download mode and is awaiting firmware upgrade.

the unit.

as follows:

■ Flashes during an incoming call.

■ Remains lit for the duration of the call.

■ Off when the LAN Modem originates a call.

Dual 56K LAN Modem receives a valid data signal (carrier) from a remote modem (such as an ISP), indicating that data transmission is possible.

data from a remote site.

a remote site.

off hook.

transmitted to the Ethernet LAN from the Dual 56K LAN Modem.

Off indicates that no data is being transmitted to the Ethernet LAN from the Dual 56K LAN Modem.

Page 17

Hardware Description 17

10-30V DC

2A MAX

RESET

LAN

LINE 1 PHONE 1 LINE 2 PHONE 2

Table 4 Front Panel LED Indicator Deﬁnitions (continued)

LED Color Description

COLL Amber Ethernet Collision Status. Flashes amber when some

collisions are taking place on the Ethernet LAN. Off indicates that no collisions are taking place on the

Ethernet LAN.

Ports 1-4 Green Ethernet LAN Port Status. On indicates that the unit

detects the Ethernet link integrity signal from an attached computer and operation is normal.

Flashes when the LAN Modem receives data on the associated port.

Off indicates that the unit does not detect the Ethernet link integrity signal. The Ethernet cable may not be properly connected or the cable may be the wrong polarity.

Back Panel Connector

Description

The back panel contains the connectors illustrated in Figure 6.

Figure 6 Dual 56K LAN Modem Back Panel

From left to right, the back panel consists of the following:

■ Power: Connect the power module cable to this port.

■ RESET: Press this button to re-initialize or factory re-set the unit (refer to

Chapter 10 for instructions).

■ LAN 1, 2, 3, and 4: Connect up to four computers (or a combination of

computers and an external hub), to these four 10BASE-T Ethernet ports.

■ LINE 1: Connect one of the provided RJ-11 analog cables from the wall outlet

to this port.

■ PHONE 1: Connect an external analog device, such as a telephone or fax

machine, to this port.

■ LINE 2: Connect the second RJ-11 analog cable from the wall outlet to this

port.

■ PHONE 2: Connect an additional external analog device, such as a telephone

or fax machine, to this port.

Page 18

18 CHAPTER 1: INTRODUCTION

Features Ease of Installation and Use

■ Web-based, point-and-click user interface for easy conﬁguration

■ Automatic Internet conﬁguration veriﬁcation via your Internet Service Provider

(ISP)

■ Web-based, context-sensitive online help

■ Dial-in Wizard for easy conﬁguration of dial-in setup

■ LAN Modem Desktop Manager tool for easy management and stats

monitoring (Windows 95

■ EZ- LAN Wizard, which optimizes workstation settings for use with the Dual

, 98®, NT® and 2000®)

56K LAN Modem (Windows 95, 98, NT and 2000)

High Performance

■ Two internal 56K modems, capable of downloading at speeds of up to 112

■ V.42/MNP 2-4 error control and V.42 bis/MNP 5 data compression

■ Hi/fn™ LZS

Kbps

(without compression)

compression, which conforms to the following IETF RFCs: The PPP

Compression Control Protocol (RFC 1962) and PPP Stacker LZS Compression Protocol (RFC 1974)

Connectivity

■ Two 56K integrated analog modems

■ Built-in four-port 10BASE-T, 10 Mbps Ethernet hub. Up to 25 users can be

supported by adding an external Ethernet hub

■ Two pass-through, analog voice ports for connecting up to two external analog

devices

■ Virtual Private Network (VPN) pass-through capability using client software

Virtual FAX Modem

■ Allows Windows users on the LAN to access one or both modems as if directly

connected through an RS-232 serial (COM) port.

■ Creates support for applications requiring a dedicated modem, such as Class

2.0 fax applications, and online services.

Routing

■ IP Routing

■ Dynamic or static IP addresses supplied by your service provider (WAN side)

■ Dynamic Host Conﬁguration Protocol (DHCP) server functionality on the LAN,

which automatically assigns an IP address to a newly-attached PC on the IP network

■ Domain Name Service (DNS) server functionality for the LAN, which translates

the common, alphanumeric name of a device (for example, “www.3com.com”) to its numeric IP address

1.Current FCC rules limit download speeds to 53Kbps per modem.

Page 19

Features 19

■ Network Address Translation (NAT) between LAN and WAN, which allows

multiple users on the LAN to share a single remote connection and user account.

■ Intelligent NAT, an enhancement to NAT which enables UDP applications to

work with the Dual 56K LAN Modem.

■ Multiplexing trafﬁc from several computers to remote destinations

Bandwidth Management

■ Automatic call initiation (also known as dial-on-demand routing)

■ Automatic disconnection of idle calls after a speciﬁed length of time

■ Multilink PPP, which combines two PPP calls on two analog lines into a single,

high-speed network connection.

■ Bandwidth on Demand using Bandwidth Allocation Control Protocol

(BACP)/Bandwidth Allocation Protocol (BAP), based on a speciﬁed threshold.

■ Dynamic Bandwidth Allocation (DBA), which allows you to place a voice or

data call while a Multilink PPP call is active.

■ Manual call connection and disconnection

Remote Management

■ Remote management via Web browser-based interface

■ Remote ﬁrmware upgrades

Protocols

■ IETF PPP (RFC 1661, 1662, 1663)

■ IETF Multilink PPP (RFC 1990)

■ IETF Password Authentication Protocol (PAP) and Challenge Handshake

Authentication Protocol (CHAP) security (RFC 1994)

■ MS-CHAP support (as deﬁned in Network Working Group Information Memo:

Microsoft PPP CHAP Extensions. S. Cob, Rev. 1.3 March 1997 including only

the functionality that keeps with IETF 1994).

■ IP address negotiation using IPCP (RFC 1332)

■ Network Address Translation (NAT) between LAN and WAN (RFC 1631)

■ Point-to-Point Tunneling Protocol (PPTP—PPTP draft-ietf-pppext-pptp-02.txt).

■ Microsoft Callback Control Protocol (CBCP)

■ BACP/BAP (RFC 2125)

■ LCP Extension Protocol (for Callback functionality) (RFC 1570)

■ Telnet Com Port Control Option (RFC 2217)

Error Control and Data Compression

■ ITU-T V.42

■ ITU-T V.42bis

■ MNP 2-5

Page 20

20 CHAPTER 1: INTRODUCTION

Modulation Schemes

■ V.90 (backwards-compatible with all US Robotics 56K Standards)

■ ITU-T V.34+

■ ITU-T V.34

■ ITU-T V.32bis

■ ITU-T V.32

■ ITU-T V.22bis

■ ITU-T V.22

■ ITU-T V.23

■ Bell 212A

■ ITU-T V.21

■ Bell 103

Security

■ PAP, CHAP and MS-CHAP support

■ Callback support for dial-in and dial-out calls

Upgradeability

■ Flash memory for ﬁeld ﬁrmware updates

■ Firmware posted on 3Com’s Web site

■ Fully upgradeable to future 56K standards

Diagnostics

■ LED status display

■ Statistics display

Warranty

■ 3Com Corporation Limited Lifetime Warranty (refer to the end of this User

Guide for details).

Support for Internet Applications

Support for applications that use the User Datagram Protocol (UDP) and the Transmission Control Protocol (TCP). The UDP protocol is used primarily by Internet games.

Look for the latest list of Internet applications and games that are interoperable with the LAN Modem at

http://www.3com.com/support/docs/lanmodem/.

Page 21

DUAL 56K LAN MODEM

UNCTIONALITY DESCRIPTION

This chapter explains the Dual 56K LAN Modem’s key functionality for users who wish to gain a fuller understanding of the LAN Modem before attempting to install and conﬁgure the unit. The following topics are covered:

■ LAN Side Connectivity: Installing an Ethernet Hub

■ Wan Side: The Two 56K Modems

■ Using the Modem Channels

■ Dial-in Functionality

■ Understanding Multilink PPP and Other Line Usage Options

■ The Virtual FAX Modem (Windows 95, 98, NT, and 2000)

■ Support for Virtual Private Networks (VPNs)

For a basic understanding of modems and networking, refer to the Networking Primer in Appendix A.

LAN Side Connectivity: Installing an Ethernet Hub

On the Local Area Network (LAN) side of the Dual 56K LAN Modem, you can connect up to four computers and/or printers directly to the unit’s built-in Ethernet hub. This allows you to create a LAN and enable ﬁle-, application-, and printer-sharing among the attached devices. By connecting an external hub (not included) to one of the four LAN ports, you can increase the number of users to a total of 25. An example of a ten-workstation connection is shown in Figure 7.

LAN StatusMODEM 2MODEM 1

OfficeConnect Dual 56k LAN Modem

r A

OfficeConnect Dual 56K LAN Modem

Port Status

Network Utilization

5678

PWR COLLPKT COAX1234

1%2% 3% 6%12%25%50%80%

Alert

green = link OK, off = link fail, yellow = partition

OfficeConnect Ethernet Hub 8

Figure 7 Dual 56K LAN Modem Ten Workstation Connection Example.

Page 22

22 CHAPTER 2: DUAL 56K LAN MODEM FUNCTIONALITY DESCRIPTION

Wan Side: The Two 56K Modems

Using the Modem Channels

On the Wide Area Network (WAN) side of the Dual 56K LAN Modem, up to 25 users can share access to the WAN through use of the LAN Modem’s two internal 56K modems. When you conﬁgure the Dual 56K LAN Modem, you can choose one of two ways to use two analog lines:

■ Two separate connections to different locations (one per analog line, or

“channel”)

■ One high-speed connection at a time, using Multilink Point-to-Point Protocol

(Multilink PPP) to combine the two analog channels into one.

For an explanation of Multilink PPP, refer to “Understanding Multilink PPP and Other Line Usage Options” later in this chapter.

Once a WAN connection is established, up to 25 users can share the open connection and access the same location simultaneously.

When you use the Dual 56K LAN Modem for its most common WAN application, dial-out remote access, you can conﬁgure up to four remote destination proﬁles, referred to as Service Providers. For each Service Provider that you conﬁgure, you can choose whether to set up the connection as a single analog “channel” connection, or as a Multilink-enabled connection.

If two or more Service Providers are set up in the LAN Modem, each as a single channel connection, the following typical dial-out scenario becomes possible, as shown in Figure 8.

Greg’s PC

Internet

Greg

Marsha’s PC

r A

OfficeConnect Dual 56K LAN Modem

LAN StatusMODEM 2MODEM 1

OfficeConnect Dual 56k LAN Modem

Greg Peter

Two analog lines

Public telephone

network

Pet

 rt Hea e h



o t t rk. ge wo

t d E

Ne e h

the f o om t r F

Peter’s PC

Remote Private

Jan’s PC

Network

Figure 8 Two Simultaneous Dial-out Connections to Two Different Remote Locations

Page 23

Using the Modem Channels 23

OfficeConnect

Dual 56K LAN Modem

Combining both analog lines with Multilink provides a single high-speed connection

Eric’s PC

Private network

Anne’s PC

Suhlle’s PC

Floyd’s PC



s R

X L

OfficeConnect Dual 56k LAN Modem

LAN StatusMODEM 2MODEM 1

Public telephone

network

If one or more Service Providers are conﬁgured as a Multilink-enabled connection, one high-speed call at a time is possible whenever one of these calls is in session, as shown in Figure 9.

Figure 9 One High-Speed Connection to a Single Location

Sharing an Already

Established Connection

In either of the above scenarios, once the dial-out connection is established, up to 25 users can share the already-open connection. The LAN Modem is designed to make use of already-established call connections in order to provide optimal line availability for all users sharing WAN access.

Whenever the LAN Modem receives an information packet requesting WAN access, it looks for an already-established connection to the speciﬁed destination (such as an ISP for an Internet connection). If an open connection is available, the LAN Modem uses this for any authorized user. The LAN Modem uses the IP address translation system, Network Address Translation (NAT), to allow multiple users to transmit their individual information packets along this same open channel. If you choose, you can restrict line sharing so that only authorized users have access to an open connection to a speciﬁed destination.

Note that speed may be affected when multiple users share a connection and attempt to download data simultaneously.

For a further explanation of NAT and IP address translation in the LAN Modem, see “IP Address Translation Using NAT,” at the end of this section, or refer to the Networking Primer in Appendix A.

Callback Capability When you conﬁgure a Service Provider proﬁle to a remote destination, you can

choose to enable Callback in the LAN Modem. With Callback enabled, your outgoing call is immediately dropped by the receiving device and then returned, provided the call-receiving device is also set up with this feature. Callback can provide potential cost savings for the dial-out party, as well as security for the call-receiving device and its attached network.

Page 24

24 CHAPTER 2: DUAL 56K LAN MODEM FUNCTIONALITY DESCRIPTION

Dial-out Call Routing When the LAN Modem makes an outgoing call, it follows a speciﬁc order for

routing data packets, based on the destination Network ID (that is, the IP address and subnet mask) associated with the packet. If you plan to conﬁgure more than one Service Provider in the LAN Modem, and in particular if you are conﬁguring both an Internet Service Provider and a Private Network Service Provider that includes Internet access, you may want to understand how routing order is determined in the LAN Modem.

When the LAN Modem receives a packet requesting WAN access, it looks ﬁrst to see whether the Network ID of the packet matches the Network ID of a conﬁgured Private Network. If the Network ID of the packet matches the Network ID of the Private Network, then the call is placed to the Private Network; if it does not match the Network ID of the Private Network, then the call is routed to the ﬁrst conﬁgured ISP connection.

IP Address Translation

Using NAT

When the Dual 56K LAN Modem is conﬁgured for any type of dial-out access, by default the IP address translation system, Network Address Translation (NAT), is used to enable IP address sharing among the attached workstations.

NAT works by taking the local, private (i.e., not “publicly-routable”) IP addresses of individual workstations attached to the LAN and translating them into a single, publicly-routable IP address assigned by the remote location and used speciﬁcally for communication across the WAN. Unlike a publicly-routable IP address, a local IP address cannot be used for communication across the WAN and is functional only within the boundaries of the LAN.

By translating the local IP addresses of each workstation in this way, the LAN Modem can send out all packets destined for the same remote location over an already-established connection. The LAN Modem in effect “masquerades” as a single user in its communication with the remote, call-receiving device.

The following example shows IP address translation as it occurs in the LAN Modem when three users share a single connection to the Internet.

Jack’s PC

192.168.1.2

Chrissy’s PC

192.168.1.3

Larry’s PC

192.168.1.4

192.168.1.2

.168.1.4

192.168.1.5

LAN Modem translates local IP addresses to ISP-assigned IP address

r A

OfficeConnect Dual 56K LAN Modem

192.168.1.1

Internet

.75

ISP-assigned IP address

204.71.201.75

LAN StatusMODEM 2MODEM 1

OfficeConnect Dual 56k LAN Modem

Analog POTS line

Public telephone

network

204.71.201

204.71.201.7 20

4.71.201.7

Analog POTS line

Janet’s PC

192.168.1.5

Figure 10 Network Address Translation in a Dial-out Connection to the Internet

Page 25

Dial-in Functionality 25

Small Office LAN

Server

OfficeConnect

Dual 56K LAN Modem

Two analog lines

Telecommuter

Internet

Public telephone

network

N O

m 3

OfficeConnect Dual 56k LAN Modem

LAN StatusMODEM 2MODEM 1

Dial-in Functionality When you set up the LAN Modem for dial-in support, you can conﬁgure up to ten

designated Dial-in Users to dial in to the local LAN. In addition, you must conﬁgure Dial-in Global Parameters which apply to all dial-in calls.

When you conﬁgure Dial-in Global Parameters, you choose whether to allow one or both channels to be used for dial-in calls. In addition, you choose whether to set up all dial-in connections as single channel calls or Multilinkenabled calls, and you also set the number of rings before the LAN Modem answers the incoming data call. Depending upon your choice, the following typical calling scenarios become possible:

Simultaneous Dial-in

and Dial-out Calls

If you conﬁgure the LAN Modem to make only one channel available for dial-in calls, you can have one dial-in and one dial out call occurring simultaneously, as shown in Figure 11.

Figure 11 Simultaneous Dial-in and Dial-out Connections

Page 26

26 CHAPTER 2: DUAL 56K LAN MODEM FUNCTIONALITY DESCRIPTION

Simultaneous Dial-in

Calls from Two Different

Locations

High-speed Dial-in Call

from One Location

If you conﬁgure the LAN Modem to make both channels available for dial-in calls, each as a single channel connection, you can have simultaneous dial-in calls from two different locations, as shown in Figure 12.

Small Office LAN

Server

m e d o 2 9

M 8 N C

L N D S I

S U T A T S

A L

1 L L O C X T 2 B 1 B N D S

I E

O P T

R E L A

Telecommuter

Public telephone

network

OfficeConnect Dual 56k LAN Modem

r A

OfficeConnect Dual 56K LAN Modem

Telecommuter

LAN StatusMODEM 2MODEM 1

Busine

ss traveler

Two analog lines

Business traveler

Figure 12 Simultaneous Dial-in Connections from Two Different Remote Locations

If you conﬁgure the LAN Modem to make both channels available as a single, Multilink connection for dial-in calls, then one high-speed dial-in call at a time is possible, as shown in Figure 13.

Line Sharing with Dial-in

Calls

Small Office LAN

Server

LAN StatusMODEM 2MODEM 1

OfficeConnect Dual 56k LAN Modem

Second small

office site

Public telephone

network

OfficeConnect

Combining both analog lines with Multilink provides a single high-speed connection

Dual 56K LAN Modem

Figure 13 One High-Speed Dial-in Connection from a Single Location

With dial-in calls to the LAN Modem, whenever an open channel is created by an incoming call via the LAN Site-to-Site dial-in scenario, the LAN Modem is designed to make use of the already-open connection by returning any data packets to the dial-in user on the open connection. This leaves the second analog channel free for use, provided you have not set the LAN Modem to combine its two lines using Multilink PPP. Without this line sharing feature, a separate, outgoing call would be launched on the second channel during data transfers.

Page 27

Understanding Multilink PPP and Other Line Usage Options 27

Callback Capability with

Dial-in Calls

Understanding Multilink PPP and Other Line Usage Options

Multilink Point-to-Point

Protocol (MLPPP)

BACP/BAP In conjunction with Multilink PPP, the protocol pair BACP/BAP (Bandwidth

When you conﬁgure the LAN Modem for dial-in support, you can choose to enable Callback in each Dial-User proﬁle that you create. When Callback is enabled, the LAN Modem is designed to identify the authorized Dial-in User, drop the incoming call, and immediately place a return call to that user. This provides security for the network attached to the LAN Modem, as well as potential cost savings for the Dial-in User.

In order for dial-in Callback to work, the calling device at the other end must also be set up with a Callback feature.

When the Dual 56K LAN Modem’s two analog lines are used independently, each uses the PPP (Point-to-Point Protocol), which is commonly used for the establishment of dial-up connections, such as to the Internet. In some conﬁgurations of the Dual 56K LAN Modem, you will encounter the following protocols, used in connection with PPP.

Multilink PPP is a protocol which allows two or more PPP connections to be combined to form a single, high-bandwidth connection or channel. In the case of the Dual 56K LAN Modem’s two 56K lines, Multilink PPP is used to combine these two 56K connections into a virtual, single 112K connection.

Allocation Control Protocol and Bandwidth Allocation Protocol) are used to negotiate the addition and removal of the second modem connection with the receiving device, based on a user-deﬁned threshold. The advantage of BACP/BAP is that it provides a higher probability of establishing a Multilink PPP call by providing a speciﬁc telephone number for the second modem to call during high trafﬁc conditions.

Dynamic Bandwidth

Allocation (DBA)

Multilink PPP

Conﬁguration Options

Dynamic Bandwidth Allocation (DBA) is another protocol used in conjunction with Multilink PPP to maximize efﬁciency of line usage. With Dynamic Bandwidth Allocation enabled, if a Multilink call is in progress, the LAN Modem can automatically and temporarily remove one of the channels from the call and use it to place a data call to another service provider without disturbing the original call. The only effect on the original call is that speed is temporarily reduced from Multilink PPP to one analog channel. Once the second outgoing data call ends, that channel is then returned to the Multilink PPP call, assuming that “Add Second Channel As Required” has been conﬁgured for that service provider. Although throughput is reduced while the second call is active, the reliability of the Multilink PPP call is maintained.

If you enable Multilink PPP when you conﬁgure the Dual 56K LAN Modem, you will be able to choose from among the following Multilink PPP options:

■ Use One Channel

When this option is conﬁgured, only one modem channel is used when connecting to a remote destination. In this case, Multilink PPP is disabled, and neither DBA nor BACP/BAP is used.

■ Use Two Channels

Page 28

28 CHAPTER 2: DUAL 56K LAN MODEM FUNCTIONALITY DESCRIPTION

When this option is conﬁgured, both modem channels are used every time a connection is made to a remote destination, regardless of the amount of trafﬁc being generated. The DBA feature is not utilized, because both channels are used for every call. Make sure that your remote destination supports this functionality.

■ Add Second Channel As Required (recommended)

When this option is conﬁgured (referred to as bandwidth on demand), initially one modem channel is used to connect to a remote destination, and the second channel is automatically added when the amount of trafﬁc on the ﬁrst channel reaches a threshold that you deﬁne. When you choose Add Second Channel as Required, you enable both Multilink PPP and DBA. This is the recommended setting for Multilink PPP.

In order for you to use Multilink PPP, the destination you are calling must also support Multilink PPP. For example, if you are trying to dial out to the Internet, your ISP must support Multilink PPP in order to successfully place a Multilink PPP call. If you attempt to place a Multilink PPP call adding a “Second Channel as Required” and the location you are calling does not support Multilink PPP, then a single channel PPP connection is established. If you attempt to place a “Use Two Channels” call and the location you are calling does not support this functionality, a connection may not be established at all.

The Virtual FAX Modem (Windows 95, 98, NT, and 2000)

The Dual 56K LAN Modem can be used with the Virtual FAX Modem application (included on the OfﬁceConnect Dual 56K LAN Modem Companion Programs CD-ROM), which enables Windows users on the LAN to access one or both of the internal 56K modems as if they were directly connected to the user’s workstation through an RS-232 serial (COM) port.

By installing the Virtual FAX Modem application onto individual workstations connected to the LAN, users can run applications that call for a dedicated modem, such as a fax application for sending Class 2.0 faxes (Class 1 or Class 2 faxes are not supported) or connecting to Online services. Use of the two modems for Virtual FAX calls can be monitored by a network administrator through the Dual 56K LAN Modem’s Manual Call Control page.

Although both modems can be used at the same time to create two Virtual FAX Modem connections, each connection can support only one user at a time. In other words, a Virtual FAX Modem connection cannot be shared.

For instructions on installing and using the Virtual FAX Modem, and for information on monitoring Virtual FAX Modem calls through the Manual Call Control page, refer to Appendix B, “Installing and Using the Virtual FAX Modem.”

Page 29

Support for Virtual Private Networks (VPNs) 29

Public telephone

network

Dual 56K LAN Modem

Workstation

with PPTP

client software

PPTP Tunnel

server

VPN tunnel

Corporate office

LAN



X L

OfficeConnect Dual 56k LAN Modem

LAN StatusMODEM 2MODEM 1

Internet

Support for Virtual Private Networks (VPNs)

Through its support of the Point-to-Point Tunnel Protocol (PPTP), the Dual 56K LAN Modem allows users on any workstation attached to the LAN Modem to communicate with a remote private network over the Internet using a Virtual Private Network (VPN) tunnel, provided the necessary client software is installed on the user’s workstation.

Although the LAN Modem allows for the transparent passage of VPN tunnel data from a computer on its LAN side to its WAN side, the LAN Modem cannot itself initiate or terminate a tunnel. In other words, the LAN Modem does not encrypt or encapsulate data on the outgoing side of the VPN connection, nor does it act as a tunnel terminator to unpack tunnel packets on the incoming side.

VPN tunnels are a private, secure means by which content-sensitive data that uses any routing protocol can be transported over the public, IP-routable-only Internet. Because a VPN tunnel is established through a local call to an Internet Service Provider, a user connecting to a remote Private Network through a VPN tunnel can eliminate long distance charges that might otherwise be incurred from dialing directly to the remote private network.

Figure 14 shows a VPN tunnel connection to a remote private network using a single, locally-dialed ISP call.

Figure 14 VPN Tunnel Connection to a Remote Private Network via an ISP

To create a VPN tunnel from a workstation attached to the Dual 56K LAN Modem, no special conﬁguration of the LAN Modem is required. The client workstation must, however, have the appropriate software, and a tunnel server must be set up at the remote private network.

Basic instructions for setting up and initiating a VPN tunnel from a client workstation are provided in Appendix C, “Creating a Virtual Private Network (VPN) Tunnel.”

Page 30

30 CHAPTER 2: DUAL 56K LAN MODEM FUNCTIONALITY DESCRIPTION

Page 31

BEFORE YOU BEGIN

OfficeConnect Dual 56K LAN Modem

OfficeConnect Dual 56K LAN Modem Getting Started Guide

One 10BASE-T Ethernet cable (RJ-45 to RJ-45)

Two analog telephone cables (RJ-11 to RJ-11)

Rubber feet and stacking clip

OfficeConnect Dual 56K LAN Modem Companion Programs

CD-ROM

Contains:

• User Guide (PDF and HTML)

• Getting Started Guide (PDF)

•

Adobe Acrobat Reader

•

Web Browsers

•

EZ-LAN Wizard

•

LAN Modem Desktop Manager

•

Virtual FAX Modem/PhoneTools Fax Software

•

Dial-Up Networking 1.3

Alert

Pow

essage

MODEM 1

MODEM 2

LAN Status

OLL

l 5

Network Assistant CD

Contains helpful networking tutorials, troubleshooting tips and product information

Phone port adapter (not provided for all locations)

Power supply transformer and country-specific power cord

etw

sistan

t •

sis

tent

e d

e R

sis

tan

t R

és

• N

etz

erk-A

sisten

ssis

ten

te d

i R

ete

3Com

Off iceConnect

Dual 56K LAN Modem

Getting Started Guide

This chapter explains how to set up your Dual 56K LAN Modem, and guides you through the basic pre-installation checks that you should perform on all workstations that you will attach to the LAN Modem. This includes checking each workstations’ TCP/IP and IP address settings to determine whether it is set up for dynamic or static IP networking. Instructions for setting up TCP/IP on your workstation are provided for users who must perform this step.

Package Contents Your Dual 56K LAN Modem package should contain all of the items shown:

Before You Begin In order to install and conﬁgure your Dual 56K LAN Modem, you should already

have the following:

■ One or two available Analog Telephone Connections, with available RJ-11

outlets

■ An Internet Service Provider (ISP) Account (unless you are only connecting

to a private network)

■ A Workstation that meets country-speciﬁc regulatory standards, with the

following requirements:

■ A 10BASE-T Ethernet card or Ethernet connectivity (Ethernet connectivity is

built in for Power Macintosh users)

■ TCP/IP software (built in with Windows 95, 98, NT, and 2000 and

Macintosh OS 7.6 or later)

■ CD-ROM drive

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32 CHAPTER 3: BEFORE YOU BEGIN

■ A Web Browser, such as Netscape Navigator (4.0 or later) or Microsoft

Internet Explorer (4.0 or later).

Your computer is used to conﬁgure the LAN Modem, in addition to being one of its networked devices. You use the web browser installed on your computer to access the LAN Modem’s internal conﬁguration screens.

Why Check TCP/IP and IP Address Settings?

TCP/IP Settings Because the Dual 56K LAN Modem is an IP-only router, any computer attached to

The Dual 56K LAN Modem is an IP router designed for optimal use with networks that use dynamic IP addressing. For most people using the LAN Modem for shared Internet access, dynamic IP addressing is the type of addressing scheme most often used by Internet Service Providers (ISPs). It is also the type of addressing prevalent in many existing corporate networks.

Although the Dual 56K LAN Modem is not limited to use with dynamic IP networks (some users may ﬁnd that their ISP or the corporate network to which they want to connect employ static IP addressing), the steps for installing and conﬁguring the Dual 56K LAN Modem will differ, depending on the type of addressing your computer is set up to use.

If you already know that you will be dialing out to a network that uses static IP addressing, or if you are setting up an advanced LAN Modem site-to-site network and plan to use a static IP addressing scheme, refer to the instructions under “Setting Up Your Computer If You Have a Static IP Address” in this chapter.

the Dual 56K LAN Modem must also have TCP/IP installed for the LAN Modem to communicate with the computer. For Windows 95, 98, NT, and 2000, and for Macintosh OS 7.6 or later, TCP/IP is provided as part of your operating system. However, if you are using Windows and have never made remote connections from your computer, you may have to add TCP/IP to your computer’s protocol list to “bind” it to your Ethernet adapter, even though the protocol is included with the operating system. Instructions for doing this are provided under “Adding TCP/IP to Your Protocols List” below.

Checking TCP/IP and IP Address Settings

Windows 95, 98, NT, and

2000:

To check your TCP/IP settings and your dynamic vs. static IP address setup, follow the instructions for your operating system. You should perform this check for each

computer that you plan to connect to the LAN Modem.

Simply run the EZ-LAN Wizard, located on the OfﬁceConnect Dual 56K Companion Programs CD-ROM included with your LAN Modem package, on your

computer. EZ-LAN checks your PC’s settings and, if you choose, optimizes them for use with the LAN Modem by making the following changes:

■ Sets your PC to obtain its IP address and subnet mask from the LAN Modem's

DHCP server.

■ Changes your PC’s default gateway settings, so that the LAN Modem is

conﬁgured as its default gateway.

■ Changes your PC’s DNS server settings, so that the LAN Modem is conﬁgured

as its DNS server.

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Checking TCP/IP and IP Address Settings 33

■ Sets applications which previously used a Dial-Up Networking connection to

use a LAN connection.

■ (Optional) Conﬁgures a statically-conﬁgured PC to access the LAN Modem’s

conﬁguration screens, and, if you choose, changes the LAN Modem’s IP address to communicate with a statically-conﬁgured PC.

If you prefer to follow the manual procedure for setting up TCP/IP, refer to “Setting Up Your Computer If You Have a Static IP Address” later in this chapter.

Before using the EZ-LAN Wizard to optimize your settings, make sure you have installed the LAN Modem hardware as described in Chapter 4 “Installing the Dual 56K LAN Modem”.

If the EZ-LAN Wizard discovers that TCP/IP is not bound to your Ethernet adapter, refer to “Adding TCP/IP to Your Protocols List” below for instructions on how to set up TCP/IP.

Mac OS 7.6 or Later Simply perform the following check to see whether your computer is set up for

dynamic IP addressing (TCP/IP is automatically installed and set up in all Power Macintoshes):

1 From the Apple menu, select Control Panels, and then TCP/IP.

The TCP/IP dialog box appears, as shown in Figure 15.

Figure 15 TCP/IP Dialog Box for Macintosh Computers

2 In the Connect Via pop-up menu, select Ethernet (if iMac, select Ethernet built-in). 3 In the Conﬁgure pop-up menu, select Using DHCP Server. All other ﬁelds should

be blank or set to <will be supplied by server>.

4 Select File, and then Close to exit the TCP/IP Control Panel, saving any changes.

You may want to rename this conﬁguration so that your previous conﬁguration is not overwritten.

You are now ready to go on to Chapter 4 to begin the LAN Modem installation.

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34 CHAPTER 3: BEFORE YOU BEGIN

Adding TCP/IP to Your Protocols List

If you ran the EZ-LAN Wizard on your computer and found that TCP/IP was not bound to your Ethernet adapter, follow the steps to add TCP/IP to your protocols list, according to your operating system:

Windows 95 and 98 To add TCP/IP to your protocols list for Windows 95 or 98:

You may be prompted for your Windows 95 or 98 installation disks or CD-ROM.

1 From the Control Panel, double-click Network.

The Network dialog box appears.

Figure 16 Network Dialog Box

2 Click Add.

The Select Network Component Type dialog box appears.

Figure 17 Select Network Component Type Dialog Box

3 Select Protocol and then click Add.

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Adding TCP/IP to Your Protocols List 35

The Select Network Protocol dialog box appears.

Figure 18 Select Network Protocol Dialog Box

4 From the Manufacturers list box, select Microsoft, and then from the Network

Protocols list box, select TCP/IP.

5 Click OK to exit the Select Network Protocol Dialog box. 6 Click OK again to exit the Network Dialog box.

You may be prompted to re-boot your workstation.

7 Run the EZ-LAN Wizard again to optimize the settings on your workstation.

Windows NT 4.0 To add TCP/IP to your protocols list for Windows NT 4.0:

You may need your Windows NT 4.0 installation CD-ROM.

1 From the Control Panel, double-click Network.

The Network dialog box appears.

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36 CHAPTER 3: BEFORE YOU BEGIN

2 Select the Protocols tab, as shown in Figure 19.

Figure 19 Windows NT Protocols Conﬁguration Window

3 Click Add.

The Select Network Protocol window appears as shown in Figure 20.

Figure 20 Select Network Protocol Window

4 Select TCP/IP Protocol, and then click OK.

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Adding TCP/IP to Your Protocols List 37

The following message appears.

Figure 21 DHCP Message Box

5 Select Yes, unless you know that you will be setting up the LAN Modem for use on

a static network. By selecting Yes, you are setting up the LAN Modem to act as your DHCP server.

If you will be connecting to a static network, select No. You are prompted to copy ﬁles. You may be prompted to insert your CD ROM.

6 If the necessary ﬁles already exist on your hard drive, click Continue. Otherwise

insert the Windows NT 4.0 CD ROM and click Continue.

If you have Remote Access Service (RAS) installed on your PC, after the appropriate ﬁles are copied to your PC, a message box asks whether or not you would like TCP/IP installed for RAS. If you select Yes, you must select the device you want to access remotely and then click Close.

7 After the appropriate ﬁles are copied to your PC, you will see TCP/IP Protocol listed

in the Network Protocols group box, as shown in Figure 22.

Figure 22 Network Protocols Window

8 Click Close.

The Microsoft TCP/IP Properties window appears, as shown in Figure 23.

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38 CHAPTER 3: BEFORE YOU BEGIN

9 From the Adapter drop-down list box, select the Ethernet card that is connected to

Figure 23 Microsoft TCP/IP Properties Window

the Dual 56K LAN Modem.

10 Select Obtain an IP Address from a DHCP Server, unless you are setting up for

static IP addressing. If this LAN uses static IP addresses, enter the IP address and subnet mask.

11 Click OK. 12 Click Yes to restart your PC and allow the changes to take effect. 13 Run the EZ-LAN Wizard again to optimize the settings on your workstation.

Windows 2000 To add TCP/IP to your protocols list for Windows 2000:

You may be prompted for your Windows 2000 installation disks or CD-ROM.

1 From the Control Panel, double-click Network and Dial-up Connections. 2 Double click Local Area Connection.

The Local Area Connection Status window opens.

3 Click Properties.

The Local Area Connection Properties window opens.

4 Click Install. 5 Select Protocol and click Add.

The Select Network Component Type dialog box opens.

6 Select Internet Protocol (TCP/IP) and then click Add. 7 Click Close to exit the Local Area Connection Properties window. 8 Click Close again to exit the Local Area Connection Status window.

You may be prompted to re-boot your workstation.

9 Run the EZ-LAN Wizard again to optimize the settings on your workstation.

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Setting Up Your Computer If You Have a Static IP Address 39

Setting Up Your Computer If You Have a Static IP Address

If your computer has a static IP address and you want to keep this for use with a network that uses or will use static IP addressing, you must make certain changes to the LAN Modem’s default parameters. These changes will allow your statically-conﬁgured PC to “talk” to the LAN Modem for its initial conﬁguration. The procedure is described in this section.

For Windows 95, 98, 2000 and NT 4.0, you can choose to use the EZ-LAN Wizard, located on the Companion Programs CD-ROM to automatically set up your statically-conﬁgured PC to access the LAN Modem. For other operating systems, or to perform this procedure manually, follow the steps outlined in this section.

The LAN Modem is designed by default to work with a dynamically-assigned network. The instructions in this section are for advanced users only.

By default, the LAN Modem is set up to establish itself automatically as the “gateway” for computers on the LAN to access the WAN. However, if a computer is set up for static instead of dynamic IP addressing, it will have a ﬁxed IP address assigned as its Gateway or Router entry that is not recognizable by the LAN Modem. In this case, when you connect your computer to the LAN Modem and turn on both for the ﬁrst time, the LAN Modem will not be able to “talk” to your workstation, and you will not be able to access the LAN Modem’s conﬁguration pages.

To communicate with the LAN Modem for its initial conﬁguration, you need to follow the procedure outlined below only for the workstation that you ﬁrst connect to LAN Modem.

The basic steps for setting up a statically conﬁgured workstation are outlined in Figure 24.

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40 CHAPTER 3: BEFORE YOU BEGIN

Record Workstation’s

Current Settings

Change Workstation

to Match LAN Modem

Launch Browser

Change LAN Modem

IP Address for Static LAN

Setup Steps for a Static

Workstation

Reset Workstation

to Original Static Settings

Figure 24 Set Up Steps for Statically Conﬁgured Workstation

The ﬁrst step is to record your current, statically-conﬁgured workstation’s network settings and set them aside for later use. Then you must temporarily change your statically-conﬁgured workstation’s network settings so that your workstation can communicate with the LAN Modem. The parameters which must be changed are your workstation’s IP address, Subnet Mask and Gateway Address.

Follow the instructions for your operating system:

These instructions assume that the LAN Modem conﬁguration is set to the factory default. If you are moving the LAN Modem from a different LAN, reset the LAN Modem before you begin. To do so, refer to “Resetting the Dual 56K LAN Modem,” Chapter 10.

For Windows 95 and 98 Users

1 From the Start menu, select Settings and then Control Panel. 2 Double-click Network, and then select TCP/IP from the scroll-down list.

If you have multiple TCP/IP entries, select TCP/IP for the Ethernet card associated with the Dual 56K LAN Modem.

3 Click Properties, and then click the Gateway tab. Write down the ﬁrst IP address

listed under Installed gateways. You will reenter this information later.

4 Click the IP Address tab. 5 Write down the values listed in the IP Address and Subnet Mask ﬁelds. You will

need to reenter this information later.

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Setting Up Your Computer If You Have a Static IP Address 41

6 Change the IP address and subnet mask ﬁelds as follows (this allows your

workstation to be recognized by the LAN Modem):

■ In the IP Address ﬁeld, enter 192.168.1.2

■ In the Subnet Mask ﬁeld, enter 255.255.255.224

7 Click the Gateway tab. 8 Change the Gateway IP address to 192.168.1.1 9 Click OK to close the Network control panel.

You are asked to restart your computer.

10 Click OK.

Your workstation has now been set up to temporarily access the LAN Modem’s initial conﬁguration screens. You are ready to go on to Chapter 4, “Installing the Dual 56K LAN Modem.” Once installed, follow the steps in Chapter 5, “Typical Conﬁguration”, and note the extra step for Static IP setup.

For Windows 2000 Users

1 From the Start menu, select Settings and then Control Panel. 2 Double-click Network and Dial-up Connections. 3 Double click Local Area Connection.

The Local Area Connection Status window opens.

4 Click Properties.

The Local Area Connection Properties window opens.

5 Select Internet Protocol (TCP/IP) and click Properties.

The Internet Protocol (TCP/IP) Properties window opens.

6 Write down the values listed in the IP Address, Subnet Mask and Default Gateway

ﬁelds. You will need to reenter this information later.

7 Change the IP address, subnet mask and Default Gateway ﬁelds as follows (this

allows your workstation to be recognized by the LAN Modem):

■ In the IP Address ﬁeld, enter 192.168.1.2

■ In the Subnet Mask ﬁeld, enter 255.255.255.224

■ In the Default Gateway ﬁeld, enter 192.168.1.1

8 Click OK to close the Internet Protocol (TCP/IP) Properties window. 9 Click OK to exit the Local Area Connection Properties window.

10 Click Close to exit the Local Area Connection Status window.

You may be prompted to re-boot your workstation.

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42 CHAPTER 3: BEFORE YOU BEGIN

1 From the Start menu, select Settings and then Control Panel. 2 Double-click Network, and then click the Protocols tab. 3 Highlight TCP/IP, and then click Properties. 4 Click the IP Address tab, and then select the Ethernet card associated with the

5 Write down the values listed in the IP Address, Subnet Mask and Default Gateway

6 Change the IP address, subnet mask and Default Gateway ﬁelds as follows (this

7 Click OK to close the Microsoft TCP/IP Properties dialog box. 8 Click OK to close the Network Control Panel box.

For Windows NT 4.0 Users

Dual 56K LAN Modem from the Adapter drop-down list box.

ﬁelds. You will need to reenter this information later.

allows your workstation to be recognized by the LAN Modem):

■ In the IP Address ﬁeld, enter 192.168.1.2

■ In the Subnet Mask ﬁeld, enter 255.255.255.224

■ In the Default Gateway ﬁeld, enter 192.168.1.1

You are asked to restart your computer.

9 Click OK.

For Macintosh Users

1 From the Apple menu, select Control Panels, and then TCP/IP.

You may want to duplicate your current conﬁguration so that your previous conﬁguration is not overwritten.

2 In the Connect Via ﬁeld, make sure Ethernet (if iMac, Ethernet built-in) is selected. 3 Look at the entry in the Conﬁgure ﬁeld. It should be set to Manually if you are on

a static network.

4 Write down the values listed in the IP Address, Subnet Mask and Router Address

ﬁelds. You will need to reenter this information later.

5 Change the IP address, subnet mask and Default Gateway ﬁelds as follows (this

allows your workstation to be recognized by the LAN Modem):

■ In the IP Address ﬁeld, enter 192.168.1.2

■ In the Subnet Mask ﬁeld, enter 255.255.255.224

■ In the Router Address ﬁeld, enter 192.168.1.1

6 Choose File, and then Close, saving any changes.

Page 43

INSTALLING THE DUAL 56K LAN

Before You Start the Installation

ODEM

This chapter explains how to connect your computer to the Dual 56K LAN Modem and install the cables in preparation for conﬁguring the unit.

When you ﬁrst set up the LAN Modem, you initially connect only one computer to the unit. After you have ﬁnished conﬁguring the LAN Modem from that computer using a standard web browser, you can then begin to network additional computers, hubs, and/or printers to the LAN Modem.

Before you install the Dual 56K LAN Modem, have the following items ready.

■ Two analog (RJ-11 to RJ-11) telephone cables (provided).

■ One 10BASE-T Ethernet cable (RJ-45 to RJ-45). It is recommended that you use

the cable provided. If, however, you choose to use another cable, it must be a straight-through, 10BASE-T Ethernet cable. A crossover cable cannot be used to connect the LAN Modem to your computer.

■ Power adapter (you must use the power adapter provided in the package).

Installation Steps To install the Dual 56K LAN Modem:

1 Turn off your computer. 2 Connect your computer to any LAN port (if you are unsure, use Port 1), using the

Ethernet cable provided, as shown in Figure 25.

LAN

RJ-45

Ethernet

cable

Figure 25 Ethernet Cable Connection

3 Connect the two analog cables to the ports labeled LINE 1 and LINE 2 on the Dual

56K LAN Modem’s back panel, and insert the opposite ends into two available analog wall jacks, as shown in Figure 26.

If you are only using one line, use the LINE 1port.

RJ-45

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44 CHAPTER 4: INSTALLING THE DUAL 56K LAN MODEM

LAN

RJ-11

RESET

Figure 26 Analog Cable Connections

You may need to use a country-speciﬁc phone adapter (optional).

RJ-11

Analog

telephone cables

Installing Analog

Equipment

You can connect up to two analog devices, such as a touch-tone telephone, answering machine, or fax machine, to the Dual 56K LAN Modem’s two pass-through PHONE ports.

You will need RJ-11 to RJ-11 cables that came with the analog devices for your analog phone port connections. In some cases, you may also need a country-speciﬁc adapter.

To install the analog devices:

4 Connect the analog device or devices to the ports labeled PHONE 1 and PHONE 2

on the back of the Dual 56K LAN Modem and to your analog equipment, as shown in Figure 27.

LINE 2 PHONE 2

LINE 1 PHONE 1

LAN

Figure 27 Analog Equipment Connection

Page 45

Before You Start the Installation 45

Alert

Power

essage

COLL

OfficeConnect Dual 56k LAN Modem

LAN StatusMODEM 2MODEM 1

ffic

ct D

l 5

5 Connect the power supply to the back of the unit, as shown in Figure 28.

LIN

LINE 1 PHONE 1

LAN

RESET

10-18 VDC 0¥ 8A MAX

Figure 28 Power Cable Connection

6 Plug the other end of the power module into a surge-protected, standard wall

outlet, and watch for the following front panel LED signals:

■ The PWR and AA indicator LEDs light up.

■ The ALERT LED ﬂashes momentarily as the unit undergoes a power-up, self-test

diagnostic.

■ After the diagnostic test has been completed, only the PWR LED remains lit.

7 Turn on your workstation.

Watch for the LAN Status LED to ﬂash and then remain lit.

This completes the Dual 56K LAN Modem installation. You are ready to go on to Chapter 5 to conﬁgure the LAN Modem for shared access to the Internet. Or, if you wish to conﬁgure the LAN Modem for shared dial-out access to a Private Network, such as a remote corporate ofﬁce LAN, refer to Chapter 6. To conﬁgure the LAN Modem for dial-in support, refer to Chapter 8.

If the installation was not successful, refer to Chapter 10, “Troubleshooting and Maintenance.”

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46 CHAPTER 4: INSTALLING THE DUAL 56K LAN MODEM

Page 47

CONFIGURING THE DUAL 56K LAN

Typical Conﬁguration The typical conﬁguration covers the following main steps.

ODEM FOR INTERNET ACCESS

This chapter explains how to conﬁgure the Dual 56K LAN Modem for the most common application — shared Internet access. If you followed the instructions provided in the Getting Started Guide, you have already conﬁgured the LAN Modem for shared Internet access. For more advanced applications, including connecting to a remote Private Network, conﬁguring advanced parameters, or conﬁguring the LAN Modem for dial-in support, refer to Chapters 6, 7, and 8, respectively.

The conﬁguration windows shown in this chapter may differ slightly from what is displayed on your computer.

Launch

Web Browser

Before You Start the

Conﬁguration

Select Country &

Telephone Numbers

Run

ISP Wizard

Verify

Configuration

Figure 29 Main Steps for Typical Conﬁguration

Before you conﬁgure the Dual 56K LAN Modem, you should already have done the following:

■ Run the EZ-LAN Wizard or performed the TCP/IP and IP Address check, as

described in Chapter 3.

■ Installed the hardware, as described in Chapter 4.

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48 CHAPTER 5: CONFIGURING THE DUAL 56K LAN MODEM FOR INTERNET ACCESS

In addition, you should have the following information ready as you go through the conﬁguration:

■ Your Analog Telephone Number or Numbers

■ ISP Telephone Number

■ ISP User ID and Password

■ ISP DNS Address (required only if your ISP does not use dynamic IP

addressing)

■ (Optional) Call Waiting Disable Command (your telephone company can

provide you with this value)

Conﬁguration Steps The following steps guide you through conﬁguration of the Dual 56K LAN Modem

for shared Internet access.

If you ran the computer pre-checks in Chapter 3 and found that your computer was set up for static IP addressing, and you chose to follow the manual setup procedure for Static IP addressing, (as opposed to using the EZ-LAN Wizard, as described in the Getting Started Guide) refer to the section “Changing the LAN Modem IP Address for Static IP Users” on page 52 once you have completed these initial conﬁguration steps.

1 Launch the Web browser on the computer that you attached to the LAN Modem

during the installation. Regardless of the start page to which your Web browser is set, your Web browser

will go to the Dual 56K LAN Modem’s initial conﬁguration welcome window. A welcome message appears, as shown in Figure 30.

Figure 30 Initial Conﬁguration Welcome Window

2 Click the Continue link.

A message box appears indicating that the LAN Modem clock is being synchronized to the date and time on your computer.

Page 49

Typical Configuration 49

The Set Password window appears. This password is used to guard access to the Dual 56K LAN Modem’s conﬁguration program. If you would like to restrict access to the conﬁguration settings, select a password and record it in a safe place.

Figure 31 Set Password Window

3 Enter a password in the Password ﬁeld and then enter the same password in the

Password (repeat) ﬁeld to conﬁrm it. If you do not wish to enter a password, leave the ﬁelds empty.

By entering a password, you restrict access to the LAN Modem’s conﬁguration screens. This password locks automatically after ﬁve minutes of inactivity.

4 Click Submit.

A message box indicates that your password has been set.

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50 CHAPTER 5: CONFIGURING THE DUAL 56K LAN MODEM FOR INTERNET ACCESS

The Set Country and Telephone Numbers screen opens, as shown in Figure 32.

Figure 32 Set Country and Telephone Numbers Screen

5 Choose your country from the drop-down list. 6 Enter your analog telephone number(s) including area code. This allows you to

take advantage of BAP/BACP to add and remove channels as bandwidth demands.

7 Click Continue.

If you chose any country other than the United States, the LAN Modem resets and then returns you to the initial Welcome screen. Continue from Step 2, above.

The ISP Wizard appears.

If you do not want to use the ISP Wizard, preferring instead to set up a connection to a Private Network, click Abort to reach the Dual 56K LAN Modem Main Conﬁguration Page. Refer to Chapter 6, “Conﬁguring the Dual 56K LAN Modem for Private Network Access, or Chapter 7, “Conﬁguring Additional Service Providers,” for instructions on conﬁguring your ISP connection manually. Note that the ISP Wizard is a helpful step towards conﬁrming the proper operation of your LAN Modem.

Page 51

Typical Configuration 51

Figure 33 ISP Wizard Window

8 In the ISP Name ﬁeld, choose any name that you wish to associate with your ISP.

9 In the Dial Out Preﬁx ﬁeld, enter the number required to access an outside line. An

example would be dialing “9” for use with a PBX. If not required, leave this ﬁeld blank.

10 (Optional) In the Call Waiting Disable Command ﬁeld, enter the value you

obtained from your telephone company for disabling Call Waiting.

If you have Call Waiting enabled on your line and you do not disable Call Waiting, then incoming calls to that line may disrupt data calls.

11 In the Telephone Number ﬁeld, enter the telephone number of your ISP.

If you want to enter a second telephone number to connect to your ISP, refer to Chapter 7, “Editing Service Provider Proﬁles,” after you have completed this typical installation procedure.

12 In the User ID and Password ﬁelds, enter your User ID and Password for your ISP

account.

13 If your ISP requires a DNS address, enter it in the DNS Address ﬁeld. If you are not

sure, leave this ﬁeld blank.

14 Click Continue.

A call is launched to your ISP, and the TX LED on the front panel of the LAN Modem ﬂashes, indicating data transmission from the LAN Modem across the WAN. A congratulations message appears.

A successful connection to the Internet veriﬁes the successful conﬁguration of your Dual 56K LAN Modem and your ISP connection. If the connection to your ISP does not go through, refer to Chapter 10, “Troubleshooting and Maintenance.”

15 Click Continue.

This completes the conﬁguration and takes you directly to the World Wide Web and 3Com’s LAN Modem Support web site.

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52 CHAPTER 5: CONFIGURING THE DUAL 56K LAN MODEM FOR INTERNET ACCESS

The LAN Modem Support Web Site

From the LAN Modem Support web site, you can register your Dual 56K LAN Modem, read any new and up-to-date information about your product, and perform ﬁrmware upgrades to the LAN Modem as they become available.

To access this LAN Modem Support web site at any time, go to:

http://www.3com.com/support/docs/lanmodem/.

The call to your ISP established via the ISP Wizard will automatically disconnect after seven minutes of inactivity. (This is a default value and can be changed. Refer to Chapter 7, “Changing Data Call Parameters,” for instructions.) To manually disconnect this call, refer to Chapter 5 “Disconnecting Calls”.

If you are setting up a statically-conﬁgured workstation, continue with “Changing the LAN Modem IP Address for Static IP Users” below. If you experience any other problems, refer to Chapter 10, “Troubleshooting and Maintenance.”

You can now connect up to three more computers and/or printers directly to your new LAN. To add more than four users using an external hub, refer to “Connecting an External Hub to the Dual 56K LAN Modem,” page 56.

Changing the LAN Modem IP Address for Static IP Users

If you followed the steps in Chapter 3 “Changing the LAN Modem IP Address for Static IP Users”, and chose to follow the manual setup procedure for static IP addressing (as opposed to using the EZ-LAN Wizard, as described in the Getting Started Guide), you must now change the LAN Modem’s default IP address to recognize your statically conﬁgured workstation. The following steps explain how this is done.

1 Access the LAN Modem’s main page by entering the following URL in your Web

browser: http://3com.oc.lanmodem. Alternatively, you can use the numeric form of this same IP address: http://192.168.1.1.

2 From the Dual 56K LAN Modem’s main conﬁguration page, click the LAN

Parameters icon.

The LAN (Ethernet) Parameters page appears.

3 In the IP Address ﬁeld, enter your workstation’s original Gateway IP address that

you recorded as part of the step sequence under “Setting Up Your Computer If You Have a Static IP Address.”

4 Click Submit.

The Dual 56K LAN Modem resets itself.

5 Quit your Web browser. 6 Reset your workstation back to the original network settings you recorded in

Chapter 3, “Setting Up Your Computer If You Have a Static IP Address.”

7 Restart your workstation.

This completes the setup procedure for using a statically conﬁgured workstation with the LAN Modem.

Page 53

The LAN Modem Main Configuration Page 53

Setting Up Additional

Service Provider Proﬁles

Conﬁguring Additional

LAN Modem Parameters

Now that you have ﬁnished conﬁguring your Dual 56K LAN Modem, you can set up a total of four additional Service Provider proﬁles. The LAN Modem deﬁnes any remote dial-out destination (including the ISP proﬁle you just conﬁgured) as a Service Provider. The LAN Modem recognizes two categories of Service Providers:

■ Internet Service Providers (ISPs), for connection to the Internet (such as that

created by the ISP Wizard). If you have another Internet Service Provider account and would like to

conﬁgure a second Internet Service Provider proﬁle, refer to Chapter 7, “Conﬁguring Additional Service Providers.” You will see the name of the ISP that you just conﬁgured listed in the Service Provider proﬁle list.

■ Private Network Service Providers, for connection to a remote Private

Network, such as a corporate ofﬁce LAN (this can include indirect access to the Internet through the corporate LAN’s Internet connection).

If you would like to set up a connection to a remote Private Network, refer to

Chapter 6, “Conﬁguring the Dual 56K LAN Modem for Private Network Access.”

The conﬁguration you just performed guided you through the basic parameters that were needed to connect you to your ISP. There are additional parameters for this ISP connection which were automatically set to default values during the conﬁguration which you change or adjust. These parameters include Domain Name, Compression, NAT, and WAN Link IP Address, as well as an alternate or Multilink ISP telephone number with which your ISP may have provided you. For information on these parameters and changing their default values, refer to Chapter 7, “Editing Service Provider Proﬁles.”

The LAN Modem Main Conﬁguration Page

Now that you have performed the initial conﬁguration of the LAN Modem, any further conﬁguration of the unit — adding additional Service Providers, conﬁguring advanced parameters, or changing current parameters — is handled through the Dual 56K LAN Modem’s Main Conﬁguration Page, also called the

WebWizard. The Main Conﬁguration Page is shown in Figure 34.

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54 CHAPTER 5: CONFIGURING THE DUAL 56K LAN MODEM FOR INTERNET ACCESS

Links From the

Illustration

Figure 34 Dual 56K LAN Modem Main Conﬁguration Home Page

Even though the Main Conﬁguration Page and its associated links are viewed within your web browser, you are looking at screens which reside inside the LAN Modem ﬁrmware, rather than on the World Wide Web.

The Main Conﬁguration Page provides links to conﬁguration, dialing, statistics pages, and online help. There are links from the illustration icons, from the buttons on the left-hand side of the page, and from the text links below the illustration. For each conﬁguration screen, context-sensitive online help is available in the frame below the main screen.

You may want to familiarize yourself with the Main Conﬁguration Page and its various options. A basic description is provided here.

The links from the illustration icons will take you to the following pages:

■ Service Providers: Takes you to the Service Providers page, where you can

conﬁgure connections to an additional ISP or to a remote Private Network, and specify V.90 modem settings.

■ Workstations: Takes you to the Workstation Parameters page, where you can

change the associations between speciﬁc workstations attached to the LAN Modem and authenticated service providers, as well as view IP address information for each workstation.

■ LAN Parameters: Takes you to the LAN Parameters page, where you can

conﬁgure Ethernet parameters for your LAN Modem.

■ Data Call Parameters: Takes you to the Data Call Parameters page, where you

can change settings for Multilink calls and set inactivity timers to allow calls to

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The LAN Modem Main Configuration Page 55

be disconnected because of network inactivity, keeping telephone usage and Internet access costs down.

■ Current Call Status: Takes you to the Current Call Information page, where

you can view information on an active call or calls.

Links from the Buttons

■ Home: Takes you back to the Main Conﬁguration Home Page.

■ ISP Wizard: Allows you to conﬁgure an ISP proﬁle using the ISP Wizard. Note

that if you already conﬁgured an ISP using the ISP Wizard, invoking the ISP Wizard again will create a new proﬁle and overwrite any previous settings. If you would like to add a second ISP proﬁle, use the Service Providers icon to access the Service Providers conﬁguration page.

■ Manual Calling: Takes you to the Manual Calling page, where you can

manually place and disconnect calls.

■ Statistics: Brings up a secondary set of buttons, through which you can view

statistics on System, Current Call, Last Call, Last 10 Calls, and Service

Providers.

■ Dial-in: Brings up a secondary set of Dial-in Conﬁguration buttons, through

which you can access the Dial-in Wizard, Dial-in Global, and Dial-in Users proﬁles for conﬁguring dial-in support in the LAN Modem.

■ Advanced: Brings up a secondary set of buttons, through which you can

access the Local DNS Table, Upgrade Check, and Maintenance pages. From the Maintenance page, you can reset the Dual 56K LAN Modem and set it up for downloading the latest ﬁrmware.

■ Password: Takes you to the Password page, where you can change or set the

password for access to the LAN Modem, as well as lock the LAN Modem’s parameter settings.

To access the Main Conﬁguration Home Page at any time, simply enter the name or numeric value of the LAN Modem’s IP address in your web browser, as follows:

http://lanmodem

http://3com.oc.lanmodem

http://192.168.1.1

You may wish to bookmark this page for easy future access.

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56 CHAPTER 5: CONFIGURING THE DUAL 56K LAN MODEM FOR INTERNET ACCESS

Connecting an External Hub to the Dual 56K LAN Modem

Once you have ﬁnished conﬁguring the Dual 56K LAN Modem, you can connect up to three additional computers, or a combination of an external Ethernet hub and computers to increase the number of users for WAN access to 25.

Figure 35 shows the more common scenario of an additional 8-port hub for a 10-user, shared WAN connection.

LAN StatusMODEM 2MODEM 1

OfficeConnect Dual 56k LAN Modem

Port Status

PWR COLLPKT COAX1234

5678

Alert

green = link OK, off = link fail, yellow = partition

OfficeConnect Ethernet Hub 8

1%2% 3% 6%12% 25%50% 80%

OfficeConnect Dual 56K LAN Modem

Network Utilization

Figure 35 10-User Shared WAN Connection Using an 8-Port Ethernet Hub

Before You Begin To create a shared WAN connection for more than four users on the Dual 56K LAN

Modem, you will need the following:

■ A 10BASE-T Ethernet hub, such as the OfﬁceConnect Ethernet Hub 8

■ A 10BASE-T Ethernet cable (two RJ-45 to RJ-45 connector ends, not provided)

■ A 10BASE-T Ethernet cable for each additional workstation

If the hub you are using does not have an MDI/MDIX switch, you will have to use a crossover cable.

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Connecting an External Hub to the Dual 56K LAN Modem 57

To connect the hub to the Dual 56K LAN Modem:

1 Insert one end of the Ethernet cable into any available LAN port on the back of the

LAN Modem, as shown in Figure 36.

OfficeConnect Ethernet Hub 8

10-18 VDC

0¥ 8A MAX

10-30 VDC 0¥ 8A MAX

RESET

8 7 6 5 4 3 2 1

DI/M

LAN

OfficeConnect Dual 56K LAN Modem

Ethernet cable

Figure 36 10BASE-T Hub-to-LAN Modem Connection

2 Insert the opposite end of the cable into one of the ports on the external Ethernet

hub.

3 If you are using an OfﬁceConnect Ethernet Hub 8, insert the opposite end of the

Ethernet cable into port 8, and then set the MDI/MDIX switch to MDI (that is, pressed in). Make sure that the LED associated with that Ethernet port is lit. If it is not, try changing the MDI/MDIX switch setting.

You can now connect any additional computers and/or printers to the remaining LAN ports.

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58 CHAPTER 5: CONFIGURING THE DUAL 56K LAN MODEM FOR INTERNET ACCESS

Page 59

CONFIGURING THE DUAL 56K LAN

Before You Start the Conﬁguration

ODEM FOR PRIVATE NETWORK

CCESS

This chapter explains how to conﬁgure the Dual 56K LAN Modem for shared access to a private network, such as a remote corporate ofﬁce LAN. This includes the option of connecting to the Internet through your private network, if your private network allows you this option.

For instructions on conﬁguring advanced parameters, or conﬁguring the LAN Modem for dial-in support, refer to Chapters 7 and 8, respectively.

The conﬁguration windows shown in this chapter may differ slightly from what is displayed on your computer.

Before you conﬁgure the Dual 56K LAN Modem for shared private network access, you should already have completed the following steps:

■ Run the EZ-LAN tool or performed the TCP/IP and IP Address check on your

computer, as described in Chapter 3.

■ Installed the hardware, as described in Chapter 4.

In addition, you will have to obtain the following information from the network administrator at your private network:

■ Telephone number(s) you must dial to access this private network

■ User ID and password you must dial to access this private network

■ IP Address and Subnet mask of your private network

Depending on the setup of your private network, you may also need the following information (check with your network administrator):

■ WAN Link IP Address (necessary if the private network to which you are

connecting requires a static IP address and subnet mask)

■ Domain Name for the private network

■ DNS IP address(es)

■ (Optional) Call Waiting Disable Command (your telephone company can

provide you with this value)

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60 CHAPTER 6: CONFIGURING THE DUAL 56K LAN MODEM FOR PRIVATE NETWORK ACCESS

Conﬁguration Steps The following steps guide you through conﬁguration of the Dual 56K LAN Modem

for shared access to a remote private network.

If you ran the computer pre-checks in Chapter 3 and found that your computer was set up for static IP addressing, refer to the section “Changing the LAN Modem IP Address for Static IP Users” on page 67 once you have completed these initial conﬁguration steps.

1 Launch the Web browser on the computer that you connected to the LAN Modem

during the installation. If you are setting up the LAN Modem for the ﬁrst time, your Web browser will go

to the Dual 56K LAN Modem’s initial conﬁguration welcome window, regardless of the start page to which your Web browser is set.

If you have already set up the LAN Modem for its initial conﬁguration, access the LAN Modem Main Page by entering http://3com.oc.lanmodem in the location bar of your Web browser, and skip to step 8, below.

A welcome message appears, as shown in Figure 37.

Figure 37 Initial Conﬁguration Welcome Window

2 Click Continue.

A message box appears, indicating that the LAN Modem clock is being synchronized to the date and time on your computer.

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Configuration Steps 61

Figure 38 Set Password Window

3 (Optional) Enter a Password in the Password ﬁeld, and enter it again in the

Password (repeat) ﬁeld to conﬁrm it.

If do not wish to enter a Password, leave the ﬁelds empty.

4 Click Submit.

A message box indicates that your password has been set. The Set Country and Telephone Numbers screen opens, as shown in Figure 39.

Figure 39 Set Country and Telephone Numbers Screen

5 Choose your country from the drop-down list. 6 Enter your analog telephone number(s) including area code and click Continue.

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62 CHAPTER 6: CONFIGURING THE DUAL 56K LAN MODEM FOR PRIVATE NETWORK ACCESS

The ISP Wizard appears.

7 Click Abort to bypass the ISP Wizard and go directly to the LAN Modem’s Main

Conﬁguration Page, also called the WebWizard.

The LAN Modem homepage opens, as shown in Figure 40.

Figure 40 Dual 56K LAN Modem Main Conﬁguration Home Page

8 From the Main Conﬁguration Home Page, click the Service Providers icon.

The Service Provider Selection window appears, as shown in Figure 41.

Service Provider is the general term used by the LAN Modem to deﬁne any type of remote dial-out destination. For purposes of routing trafﬁc, the LAN Modem recognizes two categories of Service Providers: Internet Service Providers, for direct connection to the Internet, and Private Network (Service Providers), for direct connection to a remote private network. If you conﬁgured the LAN Modem for shared Internet access before beginning this conﬁguration, then you have already created one Service Provider proﬁle. You can conﬁgure up to four Service Provider proﬁles.

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Configuration Steps 63

Figure 41 Service Provider Selection Window

9 Select New (Private Network) from the drop-down list box, and click Select.

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64 CHAPTER 6: CONFIGURING THE DUAL 56K LAN MODEM FOR PRIVATE NETWORK ACCESS

The Private Network Parameters window appears, as shown in Figure 42.

Figure 42 Private Network Parameters Window

10 In the Name ﬁeld, enter a name for this remote destination, such as the location of

the remote ofﬁce.

11 In the Dial Out Preﬁx ﬁeld, enter the number required by your location to reach an

outside line, if necessary. An example would be dialing “9” for use with a PBX. If not required, leave this ﬁeld blank.

12 (Optional) In the Call Waiting Disable Command ﬁeld, enter the value you

obtained from your telephone company for disabling Call Waiting.

If you have Call Waiting enabled on your line and you do not disable Call Waiting, then incoming calls may disrupt your modem connection.

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Configuration Steps 65

dial out preﬁx, leave the Dial Out Preﬁx ﬁeld blank and enter that preﬁx value as part of the individual telephone number ﬁeld itself (for example, ‘918005551000’).

13 In the Telephone Number 1 ﬁeld, enter the telephone number that you obtained

from your Network Administrator for accessing this private network.

14 (Optional) If your private network has a second remote access number, enter it in the

designated ﬁeld, and select Alternate or Multilink from the drop-down list (that is, choose whether you want to dial this second number as an alternate number when the ﬁrst is unavailable, or whether you want to dial this number in addition to the ﬁrst to create a high-speed, Multilink (112K) connection.

15 Under Security, enter your User ID and Password for accessing this private network

(these may be case sensitive).

16 For DNS IP Address(es), enter the Primary DNS address of your private network in

the Primary ﬁeld, if required (that is, your private network does not automatically supply these addresses upon establishing a connection). If there is a Secondary address, enter it in the Secondary ﬁeld.

17 Under Bandwidth Allocation, choose whether to always use one channel when dialing

out to this private network, add the second channel as needed, or to always use both channels.

18 Under Private Network Parameters, enter the IP Address, Subnet mask and, if

necessary, Domain Name of the private network.

The IP Address and Subnet mask ﬁelds are mandatory.

19 Under Callback Parameters, check Enable Callback if you wish to have your private

network’s remote access (receiving) device drop your call and immediately call you back whenever you connect to the network; otherwise, leave this and the remaining Callback ﬁelds at their defaults.

This function will only work properly if your remote private network supports Callback functionality.

If you chose to enable Callback, make the following selections:

■ Callback Delay: Callback Delay is the amount of time the private network

will wait before calling back this LAN Modem. By default this is set to 5 seconds.

■ Callback Timeout: Callback Timeout is the amount of time that the LAN

Modem will wait (beyond the Callback Delay) for the private network to call back. By default this is 90 seconds.

■ Callback Number: Enter your ﬁrst analog telephone number (this is the

number to which the private network will place the Callback call). Note that if a different Callback number has been speciﬁed on the server end, the server callback number takes precedence.

■ Callback Username and Password: Enter the username and password of the

callback user. These values are used to verify the server’s authenticity to the client. If the server is another LAN Modem, these ﬁelds should match the login and password ﬁelds on the serve LAN Modem’s dial-in user parameters. Note that callback authentication is optional.

20 Under Miscellaneous, make the following selections.

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66 CHAPTER 6: CONFIGURING THE DUAL 56K LAN MODEM FOR PRIVATE NETWORK ACCESS

21 Choose whether or not you want users on the LAN to be able to access the Internet

through your private network’s direct Internet connection, if your private network allows you this option.

22 Choose whether or not you would like to use PPP Data Compression when

transferring data.

23 For Network Address Translation (NAT), your choice depends upon the IP

addressing scheme (dynamic or static) used by the private network into which you will be dialing. Follow this rule of thumb:

■ If you performed the IP Address check in Chapter 3 and optimized your

computer for use with dynamic IP addressing or found that it was already optimized, choose Yes to leave NAT enabled

■ If you performed the IP Address check and set up your computer for static IP

addressing, according to the instructions in “Setting Up Your Computer If You Have a Static IP Address,” then choose No to disable NAT.

With NAT enabled, the LAN Modem makes translations between a single IP address issued by the private network to the LAN Modem and individual IP addresses of the computers on the LAN (assigned by the LAN Modem). This translation allows multiple users on the LAN to access the private network by appearing to be a single connection with a single IP address. To better understand how NAT translation works, refer to the description of NAT in Appendix A, “Networking Primer.”

24 In the WAN Link IP Address and Subnet mask ﬁelds, if the private network to

which you are connecting requires a static IP address and subnet mask, enter those values here. Otherwise, leave these ﬁelds empty.

25 For Allow Automatic Call Initiation, leave the default setting which is Yes.

If you select No, you will have to manually launch a call to this service provider every time you want to connect. You may want to change this ﬁeld to No later on if you ﬁnd that calls are being connected unintentionally as a result of packets generated by other computers on the LAN.

26 For Enable Intelligent NAT, leave the default setting, which is Yes, in order for the

LAN Modem to better support Internet applications and games. The LAN Modem delivers all unsolicited TCP/UDP packets to the workstation that

is currently communicating with the remote host that has generated these packets. If you set this ﬁeld to No, all unsolicited TCP/UDP packets are delivered to the default workstation.

27 In the Default Workstation for Incoming Packets ﬁeld, specify the workstation to

which all unsolicited TCP/UDP packets should be delivered. Note that if the Enable Intelligent NAT ﬁeld is set to Ye s, the LAN Modem ﬁrst

attempts to deliver the unsolicited TCP/UDP packets to the workstation that is currently communicating with the remote host that has generated these packets. Only if no such workstation is found are the packets delivered to the speciﬁed default workstation.

28 Advanced users can review or make changes to the V.90 modem settings

associated with this service provider by clicking Modem Settings. To leave these values set to their default settings (recommended), click Submit. For information on changing these settings, refer to “Conﬁguring V.90 Modem Control Parameters”

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Changing the LAN Modem IP Address for Static IP Users 67

This completes the conﬁguration for private network access. A message appears indicating that your parameters have been set.

If a connection script is necessary, refer to Chapter 7, “Using a Connection Script,” for assistance.

If you chose to password-protect the conﬁguration proﬁle of the Dual 56K LAN Modem and would like to lock and/or change the conﬁguration, refer to Chapter 7, “Locking and Unlocking the Conﬁguration.”

If you are setting up a statically-conﬁgured workstation, continue with “Changing the LAN Modem IP Address for Static IP Users” in this Chapter. If you experience any other problems, refer to Chapter 10, “Troubleshooting and Maintenance.”

Changing the LAN Modem IP Address for Static IP Users

If you followed the steps in Chapter 3 “Setting Up Your Computer If You Have a Static IP Address”, and chose to follow the manual procedure, you must now change the LAN Modem’s default IP address to recognize your statically conﬁgured workstation. The following steps explain how this is done.

1 Access the LAN Modem’s main page by entering the following URL in your Web

browser: http://3com.oc.lanmodem. Alternatively, you can use the numeric form of this same IP address: http://192.168.1.1.

2 From the Dual 56K LAN Modem’s main conﬁguration page, click the LAN

Parameters icon.

The LAN (Ethernet) Parameters page appears.

3 In the IP Address ﬁeld, enter your workstation’s original Gateway IP address that

you recorded as part of the step sequence under “Setting Up Your Computer If You Have a Static IP Address.”

4 Click Submit.

The Dual 56K LAN Modem resets itself.

5 Quit your Web browser. 6 Reset your workstation back to the original network settings you recorded in

“Setting Up Your Computer If You Have a Static IP Address.”

7 Restart your workstation.

Setting Up Additional

Service Provider Proﬁles

This completes the setup procedure for using a statically conﬁgured workstation with the LAN Modem.

Now that you have ﬁnished conﬁguring your Dual 56K LAN Modem for private network access, you can set up additional Service Provider proﬁles, if you desire.

To conﬁgure an additional Service Provider proﬁle for connection to another private network, repeat Steps 8 through 28 of this section. You will ﬁnd that the name you assigned to the present private network proﬁle now appears in the Service Provider proﬁle list.

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68 CHAPTER 6: CONFIGURING THE DUAL 56K LAN MODEM FOR PRIVATE NETWORK ACCESS

If you have an ISP account and would like to set up an Internet Service Provider proﬁle for shared Internet access, refer to Chapter 7, “Conﬁguring Additional Service Providers.”

The LAN Modem Main Conﬁguration Page

Now that you have performed the initial conﬁguration of the LAN Modem, any further conﬁguration of the unit — for example, adding additional Service Providers, conﬁguring advanced parameters, or changing current parameters — can be handled through the Dual 56K LAN Modem’s Main Conﬁguration Page.

Links From the

Illustration

Figure 43 Dual 56K LAN Modem Main Conﬁguration Page

The Main Conﬁguration Page provides links to conﬁguration, dialing, and statistics pages, and to online help. There are links from the illustration icons, from the buttons on the left-hand side of the page, and from the text links below the illustration. For each conﬁguration screen, context-sensitive online help is available in the frame below the main screen. Links to other help topics are also available from this frame.

You may want to familiarize yourself with the Main Conﬁguration Page and its various options. A basic description of each link is provided here.

The links from the illustration icons will take you to the following pages:

■ Service Providers: Takes you to the Service Providers page, where you can

conﬁgure connections to an additional ISP or to a remote private network, and specify your V.90 modem settings.

■ Workstations: Takes you to the Workstation Parameters page, where you can

change the associations between speciﬁc workstations attached to the LAN Modem and authenticated service providers, as well as view IP address information for each workstation.

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The LAN Modem Main Configuration Page 69

■ LAN Parameters: Takes you to the LAN Parameters page, where you can

conﬁgure Ethernet parameters for your LAN Modem.

■ Data Call Parameters: Takes you to the Data Call Parameters page, where you

can change settings for Multilink calls and set inactivity timers to allow calls to be disconnected because of network inactivity, keeping telephone usage and Internet access costs down.

■ Current Call Status: Takes you to the Current Call Information page, where

you can view information on an active call or calls.

Links from the Buttons

■ Home: Takes you back to the Main Conﬁguration Home Page.

■ ISP Wizard: Allows you to conﬁgure an ISP proﬁle using the ISP Wizard. Note

■ Manual Calling: Takes you to the Manual Calling page, where you can

manually place and disconnect calls.

■ Statistics: Brings up a secondary set of buttons, through which you can view

statistics on System, Current Call, Last Call, Last 10 Calls, and Service

Providers.

■ Dial-in: Brings up a secondary set of Dial-in Conﬁguration buttons, through

which you can access the Dial-in Wizard, Dial-in Global, and Dial-in Users pages for conﬁguring dial-in support in the LAN Modem.

■ Advanced: Brings up a secondary set of buttons, through which you can

access the Local DNS Table, Upgrade Check, and Maintenance pages. From the Maintenance page, you can reset the Dual 56K LAN Modem and set it up for download of the latest ﬁrmware.

■ Password: Takes you to the Password page, where you can change or set the

password for access to the LAN Modem, as well as lock the LAN Modem’s parameter settings.

To access the Main Conﬁguration Home Page at any time, simply enter the name or numeric form of the LAN Modem’s IP address in your web browser, as follows:

http://lanmodem

http://3com.oc.lanmodem

http://192.168.1.1

You may wish to bookmark this page for easy future access.

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70 CHAPTER 6: CONFIGURING THE DUAL 56K LAN MODEM FOR PRIVATE NETWORK ACCESS

The LAN Modem Support Web Site

If you conﬁgured your LAN Modem for indirect access to the Internet through your private network, you may wish to visit the LAN Modem Support web site, where you can register your Dual 56K LAN Modem, read any new and up-to-date information about your product, and perform ﬁrmware upgrades to the LAN Modem as they become available.

To access this LAN Modem Support web site at any time, enter the following URL in your web browser:

http://www.3com.com/support/docs/lanmodem

For information on connecting an external hub to your LAN Modem, refer to Chapter 5, “Connecting an External Hub to the Dual 56K LAN Modem”.

Page 71

ADVANCED CONFIGURATION

This chapter provides instructions on setting up additional Service Provider proﬁles (Internet or Private Network), changing your Dual 56K LAN Modem’s default settings, and conﬁguring advanced parameters. You should ﬁrst have conﬁgured the LAN Modem for Internet access and/or Private Network access following the instructions in Chapters 5 or 6 before attempting to conﬁgure advanced parameters.

The conﬁguration windows shown in this chapter may differ slightly from what is displayed on your computer.

Advanced Conﬁguration

This section covers the following topics:

■ Conﬁguring additional service providers

■ Editing service provider proﬁles

■ Associating service providers with speciﬁc computers

■ Using a connection script

■ Conﬁguring LAN parameters

■ Conﬁguring modem control parameters

■ Changing data call parameters

■ Specifying a WINS server address

■ Conﬁguring the Local DNS Table

■ Reserving DHCP Addresses

■ Using selective password protection

■ Changing your password

■ Locking and unlocking the conﬁguration

■ Disabling password protection for the Manual Calling screen

■ Conﬁguring the LAN Modem from a remote location

■ Checking for Dual 56K LAN Modem upgrades

Conﬁguring Additional Service Providers

Once you have conﬁgured at least one service provider in the Dual 56K LAN Modem, you can add service providers for Internet and/or private network access. You can conﬁgure up to a total of four service provider proﬁles, including any that you have already created through the initial setup.

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72 CHAPTER 7: ADVANCED CONFIGURATION

Adding an Internet

Service Provider

If you have already conﬁgured one Internet Service Provider using the ISP Wizard, as part the initial setup, follow the instructions in this section to add another Internet Service Provider.

Before you conﬁgure an additional Internet Service Provider, have the following information ready:

■ ISP Telephone Number

■ ISP User ID

■ ISP Password

■ ISP DNS Address (required only if your ISP does not use dynamic IP

addressing)

■ (Optional) Call Waiting Disable Command (your telephone company can

provide you with this value)

Conﬁguration Steps To conﬁgure an additional Internet Service Provider proﬁle, follow these steps:

1 From the Dual 56K LAN Modem ‘s Main Conﬁguration Home Page, click the

Service Providers icon.

The Service Provider Selection window appears, as shown in

Figure 44.

Figure 44 Service Provider Selection Window

2 Select New (Internet Service Provider) from the drop-down list box, and then click

Select.

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Configuring Additional Service Providers 73

The Internet Service Provider Parameters window appears.

Figure 45 ISP Parameters Window

3 In the Name ﬁeld, choose any name that you wish to associate with this ISP.

4 In the Dial Out Preﬁx ﬁeld, if applicable, enter the number required by your

location to reach an outside line, if necessary. An example would be dialing “9” for use with a PBX. If not required, leave this ﬁeld blank.

5 (Optional) In the Call Waiting Disable Command ﬁeld, enter the value you

obtained from your telephone company for disabling Call Waiting.

If you have Call Waiting enabled on your line and you do not disable Call Waiting, then any incoming calls will disrupt your modem connection.

The Dial Out Preﬁx and Call Waiting Disable Command will automatically be applied to both telephone numbers that you enter below (if you have more than one number). If you wish to set up one telephone number that does not require a dial out preﬁx, leave the Dial Out Preﬁx ﬁeld blank and enter that preﬁx value as part of the individual telephone number ﬁeld itself (for example, ‘918005551000’).

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74 CHAPTER 7: ADVANCED CONFIGURATION

6 In the Telephone Number 1 ﬁeld, enter the telephone number you must dial in

order to reach your ISP.

7 (Optional) If your ISP has a second remote access number, enter it in the designated

ﬁeld, and select Alternate or Multilink from the drop-down list (that is, choose whether you want to dial this second number as an alternate number when the ﬁrst is unavailable, or whether you want to dial this number in addition to the ﬁrst to create a high-speed, Multilink (112K) connection).

8 Under Security, enter your ISP User ID and Password (these may be case-sensitive). 9 For Domain Name Service (DNS) IP Address(es), enter the Primary DNS address of

your ISP in the Primary ﬁeld, if required (that is, your ISP does not automatically supply these addresses upon establishing a connection). If there is a Secondary address, enter it in the Secondary ﬁeld.

10 Under Bandwidth Allocation, choose whether to always use one channel when dialing

out to this private network, add the second channel as needed, or to always use both channels.

11 Under Callback Parameters, check Enable Callback if you wish to have your private

This function will only work properly if your Service Provider supports Callback functionality.

If you chose to enable Callback, make the following selections:

■ Callback Delay: Callback Delay is the amount of time the ISP will wait before

calling back this LAN Modem. By default this is set to 5 seconds.

■ Callback Timeout: Callback Timeout is the amount of time that the LAN

Modem will wait (beyond the Callback Delay) for the ISP to call back. By default this is 90 seconds.

■ Callback Number: Enter your ﬁrst analog telephone number (this is the

number to which the ISP will place the Callback call). Note that if a different Callback number has been speciﬁed on the server end, the server callback number takes precedence.

■ Callback Username and Password: Enter the username and password of the

callback user. These values are used to verify the server’s authenticity to the client. Note that callback authentication is optional.

Under Miscellaneous, make the following selections.

12 Choose whether or not you would like to use PPP Data Compression when

transferring data.

13 For Network Address Translation (NAT), your choice depends upon the IP

addressing scheme (dynamic or static) used by the ISP that you will be accessing. Follow this rule of thumb:

■ If you performed the IP Address check in Chapter 3 and optimized your

computer for use with dynamic IP addressing or found that it was already optimized, choose Yes to leave NAT enabled

■ If you performed the IP Address check and Set up your computer for static IP

addressing, according to the instructions in “Setting Up Your Computer If You Have a Static IP Address,” then choose No to disable NAT.

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Configuring Additional Service Providers 75

With NAT enabled, the LAN Modem makes translations between a single (Internet-routable) IP address issued to it dynamically by the ISP and individual IP addresses of the computers on the LAN (these are also dynamically assigned, but by the LAN Modem). This translation allows multiple users on the LAN to access the ISP by appearing to be a single connection with a single IP address. To better understand how NAT translation works, refer to the description of NAT in Appendix A, “Networking Primer.”

14 In the WAN Link IP Address and Subnet mask ﬁelds, if the ISP to which you are

connecting assigns you a static IP address and subnet mask, enter those values here. Otherwise, leave these ﬁelds empty.

15 For Allow Automatic Call Initiation, leave the default setting which is Yes.

16 In the Default Workstation for Incoming Packets ﬁeld, specify the workstation to

which all unsolicited TCP/UDP packets should be delivered. Note that if the Enable Intelligent NAT ﬁeld is set to Ye s, the LAN Modem ﬁrst

17 For Enable Intelligent NAT, it is recommended that you leave the default setting,

which is Yes, in order for the LAN Modem to better support Internet applications and games.

The LAN Modem delivers all unsolicited TCP/UDP packets to the workstation that is currently communicating with the remote host that has generated these packets. If you set this ﬁeld to No, all unsolicited TCP/UDP packets are delivered to the default workstation.

18 In the Default Workstation for Incoming Packets ﬁeld, specify the workstation to

which all unsolicited TCP/UDP packets should be delivered. Note that if the Enable Intelligent NAT ﬁeld is set to Ye s, the LAN Modem ﬁrst

19 Click Submit. 20 Advanced users can review or make changes to the V.90 modem settings

associated with this service provider by clicking the Modem Settings button. To leave these values set to their defaults, click Submit. To change these settings, refer to “Conﬁguring V.90 Modem Control Parameters.”

21 To conﬁgure a connection to another ISP, repeat steps 1 through 19.

If your service provider requires that you create a connection script, refer to “Using a Connection Script”.

If you wish to password-protect the conﬁguration proﬁle of the Dual 56K LAN Modem, refer to “Locking and Unlocking the Conﬁguration.”

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Adding a Private Network Service

Provider

Editing Service Provider Proﬁles

Restricting Access to

Service Providers

To add a service provider proﬁle for connection to a remote private network, follow the instructions provided in Chapter 6, “Conﬁguring the Dual 56K LAN Modem for Private Network Access.”

The following steps allow you to edit a previously conﬁgured service provider connection.

1 From the Main Conﬁguration Home Page, click the Service Providers image.

A drop-down list box appears which contains the names of your conﬁgured service providers.

2 Select the name of the service provider connection proﬁle you wish to edit.

The connection proﬁle page appears.

3 Edit the ﬁelds as desired.

For more information on the particular ﬁelds, refer to the conﬁguration instructions for the appropriate type of service provider (ISP or Private Network), or refer to the online help located in the bottom frame on the page.

4 When ﬁnished, click Submit.

If you wish to restrict a particular workstations’s access to one or more service providers, refer to the instructions under “Associating Service Providers with Workstations on the LAN.”

Associating Service Providers with Workstations on the LAN

If you wish to password protect the conﬁguration proﬁle of the Dual 56K LAN Modem, refer to “Locking and Unlocking the Conﬁguration.”

When you conﬁgure a Service Provider on the Dual 56K LAN Modem, by default that connection is made available to every workstation attached to the LAN. If, for example, you set up an Internet connection through an ISP and have 25 workstations attached to the LAN, all 25 users will be able to access the Internet through this connection. The ISP is, by default, “associated” with each user’s workstation.

You can change these associations through the Workstation Parameters page. For example, if you want only authorized workstations to have Internet access through a Service Provider connection, you can associate that Service Provider exclusively with those workstations. This would all only authorized users on the LAN access to the Internet from their computers.

To change the association between service providers and speciﬁc workstations on the LAN, follow these steps.

1 From the Main Conﬁguration Home Page, click the Workstations icon.

The Workstation Parameters window appears.

2 Modify the associations for each listed workstation by leaving the box under each

listed Service Provider checked to allow the association, or by clearing the box to disallow the association.

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Using a Connection Script 77

If you have more than one ISP conﬁgured, all automatic calls, such as a call to the Internet as a result of launching a Web browser, will be routed to the ISP listed in the ﬁrst column of the table. If you want your automatic calls to be routed to one of the other listed ISPs, clear the box(es) for any ISP(s) that you do not wish to use at this time. The call will go to the ﬁrst ISP checked.

Click Submit to save your changes.

If you wish to password protect the conﬁguration proﬁle of the Dual 56K LAN Modem, refer to “Locking and Unlocking the Conﬁguration.”

Using a Connection Script

Before You Begin To create a connection script, you will need the following information from your

Accessing the Script

Conﬁguration Page

Some service providers, such as CompuServe®, require the use of a connection script to successfully log on to their remote servers. You can create and associate speciﬁc connection scripts with each of the LAN Modem’s four service provider proﬁles.

Note that this option is provided only for those remote sites which do not offer automatic PPP negotiation. You may not be required to create a script for every service provider proﬁle that you want to access from your LAN Modem.

service provider.

■ Your user name and password.

■ The Data Bits required by the remote server (either seven or eight).

■ The Parity setting for the remote server (either none, even or odd).

■ The number of Stop Bits required by the remote server (either one or two).

You can associate a unique connection script for each of your four service provider proﬁles by entering the script via the LAN Modem’s Script Conﬁguration page.

To access the Script Conﬁguration page, do the following.

1 From the LAN Modem main page, click the Service Providers icon.

The Service Provider Selection page opens.

2 Choose the service provider for which you want to create or edit an existing

connection script and click Select. If you are creating a new service provider, choose New (Internet Service Provider) or New (Private Network) and click Select.

For instructions on creating or editing service provider proﬁles, refer to “Conﬁguring Additional Service Providers” and “Editing Service Provider Proﬁles.”

The Service Provider Parameters page opens.

3 Click the Script button located at the bottom of the Service Provider Parameters

page to access the Script Conﬁguration page. A dialog box opens.

4 Click OK to enter the Script Conﬁguration page.

The Script Conﬁguration page opens, as shown in Figure 46.

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Creating a Connection

Script

Figure 46 Script Conﬁguration Page

You can create a script from any other text editor of your choice and copy and paste the script directly into the Script Conﬁguration text box. Or you may use the buttons located along the left side of the script window to guide you through the scripting process.

Connection Script Command Syntax

The following section explains the valid script command syntax.

■ The Begin command (begin) initiates the script. The ﬁrst line of the script must

start with

■ The Delay command (delay second) designates a length of time to wait before

begin.

sending the next command in the script. The acceptable values are between 1-60 seconds.

■ The SetPort command (setport databit, parity, stopbit) allows you to

match the script to the communication port settings of the remote server. The valid databit is either

1 or 2.

■ The Transmit command (transmit “text string”) sends a text string to the

8 or 7. The valid parity is none, even, or odd. The valid stopbit is

remote server. An example of a transmit string might be your account username or password. This text must be included between the quotation marks. A carriage return is simulated by the characters

^M within the quotation

marks. The maximum length for this string is 64 characters.

■ The WaitFor command (waitfor “string, second”) allows you to designate in

the script to wait before proceeding. An example of text that you might wait for is the string

Username, for which you would send your username as a reply.

If the timeout period elapses before a matching string is received, the script

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Using a Connection Script 79

execution will abort. The maximum string length is 64 characters, and the acceptable

■ The End command completes your script. The last line of your script must

conclude with

second is between 1-60.

end.

Using the Conﬁguration

Buttons

To create a connection script using the conﬁguration buttons, do the following.

1 From the Script Conﬁguration page, click Begin.

The text begin is entered as the ﬁrst line in the script window.

2 Click Delay to set a delay interval before executing the next line of the script.

The Delay dialog box opens.

3 Enter the amount of time in seconds that your script will wait before proceeding.

This delay interval is used to allow the remote server time to process your request. Click OK when ﬁnished.

The text delay xx is entered in the script window.

4 Click Set Port.

The Data Bits dialog box opens.

5 Enter the number of Data Bits required by your service provider. Click OK when

ﬁnished. The Parity dialog box opens.

6 Enter the Parity setting required by your service provider. Enter e if the remote

server requires Even parity, o if the remote server requires Odd parity, or n if the remote server requires that parity be set to None. Click OK when ﬁnished.

The Stop Bits dialog box opens.

7 Enter 1 to set the stop bits to one, or enter 2 to set the stop bits to two, and then

click OK. Note the results in the script window. For example, if you chose the default values

for the Begin, Delay and SetPort parameters, the following text will have been automatically entered:

begin

delay 1

setport 8 n 1.

8 Click WaitFor.

The WaitFor dialog box opens.

9 Enter the string that the remote server will send as a request. An example might

be the word

10 Enter the maximum number of seconds to wait for the remote server to send the

connection request. Click OK when ﬁnished.

11 Click Transmit.

The Transmit dialog box opens. Enter the text that you want to transmit to the remote server. An example might

be your username or password. Click OK when ﬁnished.

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Add any additional Transmit or WaitFor text as required. Note that a carriage return is simulated by including text. For example: carriage return.

12 Click End when your script is complete. The last line of text in your script must

conclude with end

An example of a completed script is shown in Figure 47.

^M within the quotation marks of your transmitted

transmit “mypassword^M” will send your password along with a

Figure 47 Connection Script Example

13 Click Submit to save your script and return to the Service Provider Page.

All commands are automatically changed to lower case when the script is submitted.

Once completed, your script will be automatically invoked each time you launch a call to your service provider.

Additional Conﬁguration Buttons

The Script Conﬁguration page provides the following conﬁguration buttons, located along the bottom of the script text entry window.

■ The Submit button saves your script and returns to the Service Provider

Parameters page.

■ The Reset button restores the last saved version of your connection script.

■ The Erase button clears the script window of all text.

■ The Back button returns you to the Service Provider Parameters page without

saving any changes made to your script.

If the Back button does not return you to the Service Providers Parameters page click the Refresh button of your Web browser.

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Configuring LAN Parameters 81

Conﬁguring LAN Parameters

This section tells you how to conﬁgure the parameters of your LAN. A description of each LAN parameter is provided, followed by the conﬁguration steps. The LAN (Ethernet) Parameters window is shown in Figure 48.

Figure 48 LAN (Ethernet) Parameters Window

Understanding LAN

Parameters

The LAN (Ethernet) Parameters window contains the following ﬁelds:

Name

Displays the name for the Dual 56K LAN Modem. This name is used for DNS (Domain Name System) resolution and cannot be changed. In the example shown in Figure 48, the name LANmodem is translated to the IP address 192.168.1.1.

IP Address and Subnet Mask

The IP address is a unique address which identiﬁes the LAN Modem on your network. The default address of the LAN Modem (192.168.1.1) is a private IP address which is automatically translated by the LAN Modem into a public, Internet-routable address whenever it has to communicate across the WAN. You should leave the default, unless you are certain that this value must be changed.

You may want to change the default IP address when setting up dial-in access between two LAN Modems. This will allow you to distinguish between the two networks, which by default are the same. The LAN Modem’s Dial-in Wizard Site-to-Site scenario will set these values automatically as needed. Refer to Chapter 8, “Conﬁguring the Dual 56K LAN Modem for Dial-in Support” for more information.

The subnet mask identiﬁes the subnetwork to which your computer is connected. You should leave the default unless you are certain that this value must be changed.

WARNING: If you change the IP address and/or the subnet mask, the LAN Modem will re-initialize itself to work with the new settings. All calls will be terminated and you may need to reconﬁgure the IP address(es) of the computer(s) connected to your LAN Modem. For a LAN using static IP addresses, you must manually

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reconﬁgure the workstations’ IP addresses via the Workstations Parameters window. For a LAN using dynamic IP addresses, restart your workstation to acquire a new IP address. Or, if you have Windows 95 or 98, launch winipcfg.exe (probably located in your Windows directory), and click Release All and then Renew All. For Windows NT, run ipconﬁg /release and then ipconﬁg/renew.

Local Domain Name

The local domain name identiﬁes your LAN. LAN refers to the network created by the LAN Modem and the devices attached to it.

Enable DHCP Server

The LAN Modem provides DHCP server functionality for the LAN which automatically assigns a network or IP address to a newly attached workstation on your IP network. If another device on your LAN is providing this functionality, or if you are using static IP addresses, then you should disable the DHCP server.

NetBIOS Filtering

For Windows Users: NetBIOS is primarily used by Windows 98, 95, NT, and 2000 for local ﬁle and printer sharing, although it may also be used on other operating systems. This protocol can make spurious DNS requests which can inadvertently cause the LAN Modem to establish unwanted calls to your Service Provider, resulting in subsequent charges to your phone bill.

Conﬁguring the LAN

Parameters

The following options are provided.

■ Always Block (default): Choosing this option will block all NetBIOS trafﬁc which

has been generated on the local LAN from being passed to the WAN. In this case, calls will not be placed due to NetBIOS trafﬁc, and NetBIOS trafﬁc will not be sent to the WAN once calls have been initiated. If you have no need to perform ﬁle or printer sharing over your WAN connection, choose this option. Note that enabling the NetBIOS ﬁlter will not affect your ability to share ﬁles and printers over your LAN.

■ Block Call Initiation: This option will prevent NetBIOS trafﬁc which has been

generated on the local LAN from initiating automatic data calls. Once a call has been established, NetBIOS trafﬁc can then be passed to the WAN over the established connection. Note however that choosing this option may prevent a call from automatically timing out.

■ Never Block: Choosing this option will allow all locally-generated NetBIOS

trafﬁc to pass to the WAN. Note that enabling this option may cause the launching of spurious calls, and it may prevent these calls from automatically hanging up.

To conﬁgure LAN parameters, do the following.

1 From the Main Conﬁguration Home Page, click the LAN Parameters icon.

The LAN (Ethernet) Parameters window appears.

2 In the IP Address ﬁeld, review the default and enter a different IP address, if

required.

3 In the Subnet Mask ﬁeld, review the default and enter a different subnet mask, if

required.

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Configuring V.90 Modem Control Parameters 83

4 In the Local Domain Name ﬁeld, you may choose to enter a name to identify this

particular LAN on a network. Note that this ﬁeld is not required. Leave blank if you are unsure about how to conﬁgure a local domain name.

5 Check the Enable DHCP server box to enable it or clear the box to disable it.

WARNING: If you change the IP address and/or the subnet mask of your Dual 56K LAN Modem, the Dual 56K LAN Modem will re-initialize itself when you submit the changes by clicking Submit. When the re-initialization occurs, all calls are terminated, and you may have to reconﬁgure the IP addresses on the computers on the LAN.

6 For NetBIOS ﬁltering, make your selection from the drop-down list box. 7 Click Submit.

If you wish to password protect the conﬁguration proﬁle of the Dual 56K LAN Modem, refer to “Locking and Unlocking the Conﬁguration.”

Conﬁguring V.90 Modem Control Parameters

Understanding Modem

Controls

Most users will be able to safely leave the modem control parameters set to their default values. Advanced users may further deﬁne the manner in which the LAN Modem operates when placing V.90 calls. This section describes modem control parameters and provides instructions for changing these parameters.

Each service provider that you conﬁgure (up to four) is automatically associated with its own corresponding modem control proﬁle. If you would like to further deﬁne the performance of the modems for each service provider, you may do so as described in this section. Table 5 gives a description of each modem control parameter.

Table 5 Modem Control Parameters

Modem Control Parameter Description

US/ITU-T answer sequence Allows you to set your answer sequence. Guard Tone Allows you to specify the guard tone for your geographical

56K If enabled: Sets the minimum CONNECT rate.

Pulse (rotary) dial make/break ratio

Minimum Connect Speed Sets the minimum speed at which the modem is allowed to

Speaker Operations Allows you to change your LAN Modem’s speaker settings. Dialing Specifies either pulse or tone dialing. Data Compression Sets your data compression preference Error Control (ARQ) Sets your error control preference Advanced Modem init. String Advanced users can further modify the modem settings

region.

If disabled: Sets the ceiling CONNECT rate to 33600. Sets the make/break ratio for pulse dialing.

connect.

each time a call is made.

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Changing Modem

Controls

To access and make changes to the Modem Control parameters, do the following.

1 From the Main Conﬁguration Page, click the Service Providers icon. 2 Choose the service provider whose associated modem parameters you want to

change, and click Select.

The procedure for accessing the Modem Settings proﬁle is the same for both an ISP and a Private Network.

The selected Service Provider page opens.

3 Click the Modem Settings button located at the bottom of the Service Provider’s

page. A dialog box opens. You are asked to save any changes made to the Service

Provider screen.

4 Click Yes to close the Service Provider screen and open the Modem settings.

The Modem Connection Control page opens, as shown in Figure 49.

Figure 49 Modem Controls Page

5 Review the parameters or make changes by selecting an option from each

drop-down list box under the appropriate Modem (Modem 1 or Modem 2).

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Changing Data Call Parameters 85

6 Click Submit to save your changes.

Note that each service provider (up to four) has its own associated Modem Settings proﬁle. Changes made to one service provider will affect only that particular service provider.

Changing Data Call Parameters

This section explains how to conﬁgure Data Call Parameter settings. The data call parameters consist of Timeout Values for both automatic and manual calls, as well as Bandwidth on Demand Parameters for Multilink calls.

The Timeout Values are a useful means of controlling bandwidth efﬁciently while keeping telephone usage and Internet access costs down. If there is no network activity on a call for a speciﬁed amount of time, the call is automatically disconnected.

The Bandwidth on Demand Parameters allow you to change the threshold (%) and time delays for adding and dropping the second modem channel of a Multilink call.

A description of each setting is provided, followed by the conﬁguration steps for making changes. The Data Call Parameters window is shown in Figure 50.

Understanding Data Call

Parameters

Figure 50 Data Call Parameters Window

The Data Call Parameters window contains the following ﬁelds:

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Timeout Values

Minimum Call Duration for outgoing calls. The minimum call duration is the minimum length of time that a call must stay up before an inactivity timer can begin. The default is two minutes.

Disconnecting an Outgoing Automatic Data Call. An automatic data call is made by the LAN Modem whenever it detects activity on the LAN requiring a remote connection; an example would be a user launching his or her Web browser.

You can deﬁne the amount of time the LAN Modem should wait before disconnecting this type of data call due to inactivity. The inactivity timer runs simultaneously with the minimum call duration. For example, if the minimum call duration is set to two minutes, and the inactivity timer is set to 30 seconds, the call will be connected for at least two minutes even if there has been no activity for 30 seconds or more. To prevent a data call from being disconnected due to inactivity, enter 0 (note that you must then manually disconnect the call via the Manual Calling screen). The default is seven minutes.

Disconnect an Outgoing Manual Data Call. A manual call is established using the Manual Calling option from the LAN Modem’s main page. You can deﬁne the amount of time the LAN Modem should wait before disconnecting this type of data call due to inactivity. This inactivity timer is activated once the minimum call duration is satisﬁed and no further activity is detected. For example, if the minimum call duration is set to two minutes and the inactivity timer is set to 15 minutes, the call will be connected for at least 15 minutes. To prevent a manual call from being disconnected due to inactivity, enter 0. The default is 15 minutes.

The Desktop Manager for Windows 95/98/2000 and NT is a useful tool for manually controlling calls without requiring a Web browser. The Desktop Manager is located on the Companion Programs CD ROM or it may be downloaded from the LAN Modem Web site: http://www.3com.com/support/docs/lanmodem/util.html

Redial Attempts for a Manual Call. This ﬁeld designates the number of times the LAN Modem will redial a call that is placed using the Manual Call Control screen. By default this is set to 0. Acceptable values are between 0 and 255 times.

Delay Between Redial Attempts for a Manual Call. This ﬁeld designates the length of time in seconds to wait before redialing a manual call. Acceptable values are between 4 and 240 seconds.

Bandwidth on Demand Parameters

Telephone Number 1. This ﬁeld speciﬁes the telephone number used for Line 1. This number is invoked for certain types of Bandwidth on Demand calls.

Telephone Number 2. This ﬁeld speciﬁes the telephone number used for Line 2.

Connect/Disconnect Threshold for the Second Channel. If you had speciﬁed use of the second channel “only as needed” under your Service Provider settings,

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Specifying a WINS Server Address 87

indicate the bandwidth percentage threshold at which to allocate of remove the second channel. By default this threshold is 60%.

Connect Delay. If you had speciﬁed use of the second channel “only as needed” under your Service Provider settings, indicate the length of time that the LAN Modem should wait before adding the second channel, once the default threshold has been breached. By default the length of time is 10 seconds.

Disconnect Delay. If you had speciﬁed use of the second channel “only as needed” under your Service Provider settings, indicate the length of time that the LAN Modem should wait before removing the second channel, once the default threshold has been breached. By default the length of time is 20 seconds.

Outgoing Call Control

Enable Outgoing Calls on Line 1. Check this box to enable the LAN Modem to place outgoing calls on modem 1. If you want to prevent any outgoing calls from being placed on this line, uncheck this box. Outgoing calls are enabled by default.

Enable Outgoing Calls on Line 2. Check this box to enable the LAN Modem to place outgoing calls on modem 2. If you want to prevent any outgoing calls from being placed on this line, uncheck this box. Outgoing calls are enabled by default.

Conﬁguring the Data

Call Parameters

Specifying a WINS Server Address

To disable all outgoing calls from being placed by any device on the LAN, uncheck both boxes for Outgoing Call Control.

To conﬁgure data call parameters, follow these steps:

1 From the Dual 56K LAN Modem Main Conﬁguration Page, click the Clock icon. 2 Specify the Data Call Parameters. 3 Click Submit.

If you wish to password-protect the conﬁguration proﬁle of the Dual 56K LAN Modem, refer to “Locking and Unlocking the Conﬁguration.”

WINS (Windows Internet Naming Service) is used on Windows NT servers to associate a computer’s host name with its IP address. If you have a WINS server setup on your network, you can specify the IP address of the WINS server via the LAN Modem’s Maintenance page.

To set a WINS server address, do the following.

1 From the LAN Modem’s Main page, click the Advanced button.

The Advanced submenu opens.

2 Click the Maintenance button.

The Maintenance page opens.

3 In the WINS Server Address ﬁeld, specify the IP address of your network’s WINS

server.

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4 Click Submit.

Conﬁguring the Local DNS Table

The Dual 56K LAN Modem includes a local DNS Table for conﬁguring up to ten static DNS entries. This allows the LAN Modem to resolve designated IP addresses locally. The Local DNS Table can be used to suppress spurious calls which can occur when an application on the LAN generates packets which in turn launch an unwanted call to your service provider.

For example, to suppress spurious calls, do the following. If an application on the LAN is generating packets to a particular domain address, such as “company.com”, you would enter that name (“company.com”) in the Domain Name ﬁeld, and then enter 192.168.1.29 in the IP address ﬁeld. This is an IP address that resides on the LAN Modem’s default subnet, but by default is not used by any attached workstations. Now, packets to “company.com” will be routed to this unused IP address, and will no longer launch automatic calls.

Another potential application of the Local DNS Table is to assign a domain name to a frequently visited IP address. In this case, you would enter the IP address in the IP address ﬁeld, and enter a domain name of your choice, such as “my_site.com” in the Domain Name ﬁeld. This will resolve the name “my_site.com” to the associated IP address.

■ To access the DNS Conﬁguration Table, follow these steps:

1 From the LAN Modem Main Conﬁguration Page, click the Advanced button. 2 Click the Local DNS Table button.

The Local DNS Table window opens, as shown in Figure 51.

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Reserving DHCP Addresses 89

Figure 51 Local DNS Table

3 Enter the domain names and IP addresses as desired, and click Submit to save

changes.

Reserving DHCP Addresses

Changing Your Password

If you have workstations on your LAN with static IP addresses and other workstations on the same LAN with dynamic IP addresses, it is recommended that you reserve the static IP addresses in the DHCP server to ensure that they are not dynamically assigned to another workstation.

Reserve DHCP addresses as follows.

1 From the LAN Modem main page, click the Workstations graphic.

The Workstation Parameters window opens.

2 Click the Workstation Conﬁguration tab. 3 Locate the Workstation for which you would like to reserve the IP address on the

DHCP server.

4 Check the box labeled Reserved. 5 Click Submit.

If you want to password protect the conﬁguration proﬁle of the ISDN LAN Modem, refer to “Locking and Unlocking the Conﬁguration.”

A password allows you to restrict access to the Dual 56K LAN Modem’s conﬁguration screens. To change the password which was deﬁned as part of the initial setup, or to set a password for the ﬁrst time, do the following:

1 From the Dual 56K LAN Modem Home Page, click the Password button.

The Password window appears, as shown in Figure 52.

Figure 52 Password Window

2 Under Change Password, enter the new password in the Password ﬁeld.

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3 Enter the same password in the Password (repeat) ﬁeld to verify.

Make sure you have deleted the old password completely before reentering the new password.

4 Check the box if you wish to disable password protection for the Manual Calling

screen only. This allows workstations on the LAN to access only the Manual Calling screen from the LAN Modem Home Page without a password, so that they can place and terminate manual calls. All other pages remain inaccessible without a password.

5 Click Submit.

Once you have set a password on your LAN Modem, and the unit remains idle for ﬁve minutes or longer, you may be “locked out” of the LAN Modem Home Page. If this occurs, you will be prompted to enter your password in order to gain access to the Home Page again.

What If I Forget My

Password?

Locking and Unlocking the Conﬁguration

If you forget your password, you must reset the Dual 56K LAN Modem to the factory default settings, which will allow you to enter a new password. Note that when the Dual 56K LAN Modem is restored to the factory default settings, all conﬁguration changes are lost, including your service provider proﬁles. For instructions, refer to Chapter 10, “Resetting the Dual 56K LAN Modem.”

If you chose to password-protect the Dual 56K LAN Modem when you initially conﬁgured the unit, you can lock and unlock the LAN Modem conﬁguration parameters from this page. Locking the LAN Modem means that you evoke the password protection immediately, rather than waiting for the ﬁve minute timeout.

If you did not set a password on the LAN Modem during the initial conﬁguration, you cannot lock the LAN Modem’s parameters.

To lock the conﬁguration:

1 From the LAN Modem Main Conﬁguration Page, click the Password button. 2 Under Lock Conﬁguration, click the Lock Conﬁguration button.

A message indicates that the conﬁguration is locked.

To unlock the conﬁguration:

1 When the Lock Conﬁguration, screen opens, click Continue.

The Enter Password window appears.

2 Enter your password to access the Dual 56K LAN Modem Main Conﬁguration

Page.

3 Click Submit.

The Dual 56K LAN Modem Main Conﬁguration Page appears. You now have access to all of the LAN Modem conﬁguration screens.

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Using Selective Password Protection 91

Using Selective Password Protection

Conﬁguring the LAN Modem from a Remote Location

You can set up partial password protection so that workstations may access only the Manual Calling screen, allowing them to manually place and receive calls only. In this case, all other WebWizard pages remain inaccessible.

Note that enabling selective password protection also allows all users access to the LAN Modem Home Page so that they can navigate to the Manual Calling screen. If users attempt to access any page other than Manual Calling or online help, the LAN Modem prompts the user to enter a password.

To set up selective password protection, follow these steps:

1 From the LAN Modem Home Page, click the Password button. 2 Check the box labeled Disable password protection for the Manual Calling screen. 3 Click Submit.

All workstations are now able to access the Manual Calling screen by clicking the Manual Calling button from the LAN Modem Home Page. For instructions on placing manual calls, refer to Chapter 9, “Placing a Call Manually.”

This section provides instructions for dialing in to the Dual 56K LAN Modem from a remote location, using either a modem or another analog LAN Modem, in order to make conﬁguration changes. To access the Dual 56K LAN Modem from a remote location, you must have a Web browser and any PPP dialer software, such as Windows 95/98’s Dial-Up Networking, installed on the remote computer.

Before you can make remote conﬁguration changes to the LAN Modem, the default Remote Administration Username and Password must be known. Authorized users who dial in to the LAN Modem using the Remote Administration password to make remote conﬁguration changes are allowed access only to the LAN Modem itself (that is, its conﬁguration screens); not to any networked devices “behind” the unit. This prevents an unauthorized user from dialing in to a LAN Modem that has been conﬁgured for full dial-in support and making conﬁguration changes.

If you are dialing in to the Dual 56K LAN Modem for remote conﬁguration purposes only, it is not necessary to conﬁgure the unit for full dial-in support. However, for dial-in access to networked devices “behind” the LAN Modem, refer to Chapter 8 for instructions on conﬁguring the LAN Modem for full dial-in support.

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92 CHAPTER 7: ADVANCED CONFIGURATION

Changing the Remote

Administration

Password

Conﬁguring the LAN Modem Remotely via Another LAN Modem

By default, the Dual 56K LAN Modem’s default Remote Administration Username is Admin, and the Password is 1234. For security purposes, it is recommended that you change the default password. To do so, follow these steps:

1 From the Dual 56K LAN Modem Main Conﬁguration Page, click the Dial-in

button.

2 Click the Dial-in User button.

The Dial-in User Selection window opens.

3 Select Admin, and then click Next. 4 In the Username ﬁeld, delete the default name, and enter a unique Username. 5 In the Password ﬁeld, delete the default password and enter a new Password.

Record this information for use by an authorized remote user or users only.

6 Click Submit.

To dial in to the Dual 56K LAN Modem to make remote conﬁguration changes using another LAN Modem, follow these steps:

Auto Answer must be enabled to allow dial-in access to the LAN Modem. By default, Auto Answer is disabled; in this case, all incoming calls will be routed to any analog equipment connected to one of the PHONE ports. Refer to “Conﬁguring Dial-in User Parameters” in Chapter8, “Conﬁguring the Dual 56K LAN Modem for Dial-in Support” for more information.

1 Ensure that the two LAN Modems are on different subnetworks.

For instance, one LAN Modem can be on the 192.168.1.x subnetwork, and the other one can be on the 192.168.2.x subnetwork.

2 In the local LAN Modem (from which you are accessing the remote Dual 56K LAN

Modem), create a Private Network Service Provider proﬁle for the remote Dual 56K LAN Modem.

3 Under Security, enter the Remote Administration Username and Password

assigned to the remote LAN Modem.

4 Under Miscellaneous, leave the WAN Link IP Address ﬁeld blank. 5 Enter the IP address of the remote LAN Modem in your Web browser’s URL ﬁeld.

A connection is established.

6 Enter your password, if applicable.

The LAN Modem Main Conﬁguration Page of the remote Dual 56K LAN Modem appears. You now have full access and can make any conﬁguration changes as if you were connected via the local LAN.

You are not able to browse the Internet while remotely accessing your LAN Modem. During a remote conﬁguration of the ISP Wizard, clicking the Continue button will not place a call to your ISP to conﬁrm a successful conﬁguration.

Page 93

Configuring the LAN Modem from a Remote Location 93

Conﬁguring the LAN

Modem Remotely via an

Analog Modem

To dial into a LAN Modem from a remote location using an analog modem and Windows 95/98 Dial-Up Networking, follow these steps:

1 Click Start, Programs, Accessories, (Windows 98 users select Communications)

and select Dial-Up Networking.

2 Double-click Make New Connection.

The Make New Connection window opens.

3 Enter a name to designate this dial-up proﬁle, such as LAN Modem. 4 Select the modem attached to your local PC from the drop-down list box, and click

Next. The Make New Connection phone number window will open.

5 Enter the phone number of the remote LAN Modem to which you wish to connect

and click Next.

6 Click Finish to complete the Make New Connection setup.

You will now have a new icon for the connection just created.

7 Right-click this new icon, and choose Properties. 8 Click the Server Type tab.

For Windows 95 users: PPP, Windows 95, Windows NT 3.5, Internet should be chosen in the Type of Dial-Up Server list box.

For Windows 98 users: PPP, Internet, Windows NT Server, Windows 98, should be chosen in the Type of Dial-Up Server list box.

9 Under Advanced Options, uncheck all boxes.

10 Choose the TCP/IP check box for Allowed Network Protocols. Uncheck the boxes

for NetBEUI and IPX/SPX Compatible.

11 Click TCP/IP Settings.

The TCP/IP Settings window opens.

12 Click Specify an IP address and enter an IP address for your computer. Enter

192.168.2.1 if you are not sure.

13 Leave the other options for this window at their default settings, including the

radio button for Server assigned name server addresses.

14 Click OK to close the TCP/IP Settings window. 15 Click OK to close the Server Types window. 16 Click OK to close your connection window. 17 Double-click your new connection icon created via Dial-Up Networking.

The Connect To window will open.

18 Enter the Remote Administration Username and Password that was assigned to

the Dual 56K LAN Modem. By default, the Username is Admin, and the Password is 1234.

19 Click Connect.

Your local computer will dial and establish a connection with your remote LAN Modem.

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94 CHAPTER 7: ADVANCED CONFIGURATION

20 Once your call has been established, launch a Web browser on your local

computer. The Web browser attempts to load its default Start Page. Click Stop to cancel this

procedure.

21 Enter the following address in your Web browser’s address bar:

http://192.168.1.1 to go to the remote LAN Modem’s Main Conﬁguration Page.

If you previously set your LAN Modem’s IP address to something other than the factory default address, enter this IP address in your Web browser’s address bar in place of the address shown in the URL above.

22 If the LAN Modem is password-protected, re-enter the Password, and then click

Submit.

The LAN Modem Main Conﬁguration Page appears. You now have full access and can make any conﬁguration changes as if you were connected via the local LAN.

You are not able to browse the Internet while remotely accessing your LAN Modem using the steps described in this section. To access the Internet or other devices on the remote LAN, you must ﬁrst set up the LAN Modem for Dial-in access. Refer to Chapter 8, “Conﬁguring the Dual 56K LAN Modem for Dial-in Support” for assistance.

Checking for Dual 56K LAN Modem upgrades

The Dual 56K LAN Modem has an Upgrade Check feature which will query the LAN Modem’s Internet homepage for available ﬁrmware updates.

You must have at least one Service Provider conﬁgured with Internet access in order to use this feature.

To check for new ﬁrmware updates, following these steps:

1 From the LAN Modem Home Page, click the Advanced button. 2 Click the Upgrade Check button.

The Check for Upgrades window opens.

3 Click Check for Upgrades.

A call is launched to your service provider. The LAN Modem compares the latest available ﬁrmware against the ﬁrmware currently installed.

If your LAN Modem has the latest ﬁrmware installed, you receiving a message saying that it is not necessary to upgrade at this time.

If a more current version of the ﬁrmware has been released, you receive a message indicating that new ﬁrmware is available. Click the Download link to access the LAN Modem Upgrade page. Follow instructions for your operating system to download the latest ﬁrmware.

Page 95

CONFIGURING THE DUAL 56K LAN

Understanding Dial-in Basics

ODEM FOR DIAL-IN SUPPORT

This chapter describes how to conﬁgure the LAN Modem for dial-in support. The following topics are covered.

■ Understanding Dial-in Basics

■ Understanding the Three Dial-in Proﬁle Types

■ Part I. Conﬁguring the Server-side Dual 56K LAN Modem for Dial-in Support

■ Part II. Conﬁguring a Client Device for Dial-out Access

The conﬁguration windows shown in this chapter may differ slightly from what is displayed on your computer.

Setting up the LAN Modem for dial-in support is a two-part process involving the following main steps:

Part I. Conﬁguring the server-side LAN Modem to receive incoming, dial-in calls. This includes:

■ Changing the Remote Administration Username and Password

■ Conﬁguring Dial-in Global Parameters (general parameters that apply to

all dial-in calls.)

■ Creating a Dial-in User Proﬁle for each dial-in proﬁle (up to ten) that will

make incoming calls to the server-side Dual 56K LAN Modem.

Part II. Conﬁguring a client device (such as an analog modem or second LAN Modem) for dial-out access to the server-side LAN Modem

Since the device that dials out to the server-side LAN Modem may also be a LAN Modem, the terms “server” or “server-side” and “client” or “client-side” are used throughout this chapter to distinguish between the LAN Modem that receives dial-in calls (server-side) and the LAN Modem or other device that makes dial-out calls (client-side). In some cases, the same LAN Modem will be conﬁgured as both a server-side LAN Modem and a client-side device.

The Dual 56K LAN Modem can only accept dial-in calls from another analog device, such as an analog modem, a 56K LAN Modem or Dual 56K LAN Modem, or another analog router. It cannot accept dial-in calls from an ISDN terminal adapter or an ISDN LAN Modem.

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96 CHAPTER 8: CONFIGURING THE DUAL 56K LAN MODEM FOR DIAL-IN SUPPORT

Understanding the Three Dial-in Proﬁle Types

Single User Dial-in The Single User Dial-in proﬁle applies to any client device that uses a single IP

When you create a Dial-in User Proﬁle as part of the server-side LAN Modem conﬁguration process, you must select from among three Dial-in Proﬁle Types to identify the type of client device that will dial in to the server-side LAN Modem. This section explains the three dial-in proﬁle types and tells you when to select one over the other.

address (issued by the server-side LAN Modem) to communicate with the server-side LAN Modem across the WAN. The client device which dials into a remote LAN Modem for Single User Dial-in is often a single analog modem.

Single User Dial-in may also use an analog router (such as a second LAN Modem) that uses Network Address Translation (NAT) to share one IP address among multiple users, similar to a typical ISP connection. Note that unlike the LAN Modem Site-to-Site proﬁle (described later), the Single User scenario does not provide for bidirectional LAN-to-LAN connectivity. While authorized workstations attached to the client LAN Modem can share the connection to the remote LAN Modem, workstations connected to the server LAN Modem cannot access client-side resources.

Choose Single User Dial-in when your dial-in user will access a server LAN Modem via a single analog modem, or via a LAN Modem that will share one IP address for all attached workstations. Note that in this scenario, workstations on the server-side cannot access client-side resources.

For a full explanation of Network Address Translation, refer to Appendix A.

Figures 53 and 54 illustrate the two possible Single User Dial-in proﬁle type scenarios.

192.168.1.2

192.168.1.3

192.168.1.4

192.168.1.5

Server-side LAN

r A

OfficeConnect

Dual 56K LAN Modem

192.168.254.1 192.168.254.1

LAN StatusMODEM 2MODEM 1

OfficeConnect Dual 56k LAN Modem

LAN Modem issues

single IP address to

incoming client

Public telephone

network

Dial-in user with

analog modem

calls into LAN Modem

Page 97

Understanding the Three Dial-in Profile Types 97

2.168.2.2

192.168.2.3

Server-side LAN

Client-side LAN

OfficeConnect

Dual 56K LAN Modem

192.168.254.1

OfficeConnect

56K LAN Modem

Server-side LAN Modem issues

single IP address to

client-side LAN Modem

Client-side LAN Modem

calls into server-side LAN Modem

and receives IP address.

NAT then translates issued IP address

among attached workstations

Public telephone

network

OfficeConnect Dual 56k LAN Modem

LAN StatusMODEM 2MODEM 1

192.168.1.2

192.168.1.3

192.168.1.4

192.168.1.5

Figure 53 Single User Dial-in from an Analog Modem

Figure 54 Single User Dial-in from an Analog Router Using NAT

LAN Modem Site to Site

Dial-in

The LAN Modem Site-to-Site Dial-in proﬁle describes a scenario where a LAN Modems dials into another LAN Modem, where workstations on both sides of the connection can access servers and resources on each LAN. Because each LAN Modem resides on different subnets, the Site-to-Site scenario provides bi-directional LAN-to-LAN connectivity.

When the Site-to-Site scenario is ﬁrst conﬁgured via the Dial-in Wizard (refer to “Creating a Dial-In User Proﬁle Using the Dial-In Wizard” for information), the client LAN Modem will automatically change its default IP address and restart. This is to distinguish between each LAN Modem’s subnet address, which by default are identical (192.168.1.x).

Choose this dial-in proﬁle type if you are setting up a network between two or more sites, using a LAN Modem at each site, and you want any device on any LAN to be able to communicate directly with any other device on any other LAN (“peer-to-peer” networking). Note that when you choose the LAN Modem Site-to-Site Dial-in proﬁle, you must perform both sets of conﬁguration step sequences—create a dial-in proﬁle and create a service provider connection—on each LAN Modem.

In a LAN Modem Site-to-Site setup, neither LAN Modem uses NAT for IP address translation. This allows workstations from both LANs to “see” and therefore send packets to workstations on the opposite LAN. In addition, users on either LAN can refer to workstations on the opposite LAN by domain name, as well as IP address.

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98 CHAPTER 8: CONFIGURING THE DUAL 56K LAN MODEM FOR DIAL-IN SUPPORT

This is because the called LAN Modem acts as the DNS server for workstations attached to the calling LAN Modem. An example of a LAN Modem Site-to-Site setup is shown in Figure 55.

The called LAN Modem

acts as DNS server to perform

workstation name-to-IP address

192.168.1.2

resolution for this call

192.168.2.2

192.168.1.3

192.168.1.4

192.168.1.5

r A

Site A

LAN Modem

192.168.1.1 192.168.1.1

LAN StatusMODEM 2MODEM 1

OfficeConnect Dual 56k LAN Modem

The called LAN Modem

issues its own IP address

as WAN IP address for this call.

Public telephone

network

ACD

r A

192.168.2.1192.168.1.1

Site B

LAN Modem

LAN StatusMODEM 2MODEM 1

OfficeConnect Dual 56k LAN Modem

192.168.2.3

192.168.2.4

192.168.2.5

Figure 55 LAN Modem Site-to-Site Dial-in Proﬁle Type

Choose LAN Modem Site-to-Site when your dial-in user will access a LAN Modem from another LAN Modem, where LAN resources are accessible on both ends of the connection.

Advanced Dial-in The Advanced Dial-in proﬁle applies to a network scenario in which a router

other than a LAN Modem will be dialing into the Dual 56K LAN Modem. Advanced Dial-in assumes that both the Dual 56K LAN Modem and the other router have been manually conﬁgured for static IP addressing, and each employs a unique range of addresses, as shown in Figure 56.

192.168.1.2

100.101.102.2

192.168.1.3

192.168.1.4

192.168.1.5

LAN StatusMODEM 2MODEM 1

OfficeConnect Dual 56k LAN Modem

192.168.1.1

OfficeConnect

Dual 56K LAN Modem

Public telephone

network

100.101.102.1

Analog router

(other than LAN Modem)

TXLKRX

100.101.102.3

100.101.102.4

100.101.102.5

Figure 56 Advanced Dial-in Proﬁle Type

Choose Advanced Dial-in if your LAN is using static IP addressing, or your dial-in user will be accessing a LAN Modem from a router other than a LAN Modem. Note that the Advance Dial-in is the most complex dial-in scenario and may require the assistance of your MIS administrator. Refer to “Creating a Private Network Service Provider Proﬁle”, which includes suggestions for conﬁguring the Advanced dial-in parameters, for more information.

Once you have chosen a dial-in scenario that best ﬁts your dial-in criteria, you are ready to conﬁgure the server-side LAN Modem for dial-in access. Refer to “Part I. Conﬁguring the Server-side Dual 56K LAN Modem for Dial-in Support” or “Creating a Private Network Service Provider Proﬁle” to manually create or further deﬁne dial-in users.

Page 99

Part I. Configuring the Server-side Dual 56K LAN Modem for Dial-in Support 99

Configure

Dial-in Global Parameters

Create a Dial-in User Profile

for the Client Device

Change the Remote Administration

Username and Password

Part I. Conﬁguring the Server-side Dual 56K LAN Modem for Dial-in Support

Before You Start the

Conﬁguration

Conﬁguring the server-side Dual 56K LAN Modem for dial-in support involves the following main steps:

Before you start the conﬁguration, you should already have completed the following steps:

■ Run the EZ-LAN tool or performed the TCP/IP and IP Address check on the

workstation you are using to conﬁgure the Dual 56K LAN Modem, as described in Chapter 3.

Changing the Remote

Administration

Username and Password

■ Installed the Dual 56K LAN Modem hardware, as described in Chapter 4.

Note that any remotely-located device that you wish to access on a remote LAN Modem, such as a workstation or server must be running appropriate software, such as Web or FTP server software. Examples of server software are Apple’s Personal Web Sharing for the Macintosh or Microsoft’s Peer Web Services for Windows 95/98. Check with your computer’s accompanying documentation for more information.

The Remote Administration account is a restricted version of a Dial-in User Proﬁle which allows for limited dial-in access to the Dual 56K LAN Modem for remote conﬁguration purposes only. By default, a Remote Administration account is already set up in the LAN Modem, with the following defaults:

Username: Admin Password: 1234

Before you conﬁgure the Dual 56K LAN Modem for full dial-in access, it is recommended that you change these defaults as follows:

1 From the LAN Modem Main Conﬁguration Page, click the Dial-in button. 2 Click Dial-in User.

The Dial-in User Selection window opens.

3 Select Admin, and then click Select. 4 In the Username ﬁeld, delete the default name, and enter a unique Username. 5 In the Password ﬁeld, delete the default password and enter a new Password.

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100 CHAPTER 8: CONFIGURING THE DUAL 56K LAN MODEM FOR DIAL-IN SUPPORT

6 Click Submit.

This completes the change to the Remote Administration account. Go on to “Conﬁguring Dial-in Global Parameters.”

Conﬁguring Dial-in

Global Parameters

The Dial-in Global Parameters allow you to set dial-in preferences that will apply to all dial-in users. These include designating a Callback preﬁx, setting a Site Number for LAN-to-LAN dial-in, conﬁguring Auto Answer, and setting authentication preferences.

To conﬁgure Dial-in Global Parameters in the server-side Dual 56K LAN Modem, follow these steps:

1 From the LAN Modem Main Conﬁguration page, click the Dial-In button. 2 Click Dial-in Global.

The Dial-In Global Parameters window opens, as shown in Figure 57.

Figure 57 Dial-In Global Parameters Window

3 In the Channels allocated for Dial-in ﬁeld, select 1 to allocate only one telephone

line for dial-in calls (the default). Choose 2 to allow both telephone lines to be used for dial-in calls, either by a single user making a Multilink PPP call, or by two users dialing in simultaneously.

4 In the Allow Multilink ﬁeld, check the box to allow both telephone lines to be used

by a single caller for a Multilink call, or leave the box unchecked to allow only one line per dial-in call. Note that if you choose to allow Multilink, both telephone lines will be used for each dial-in call received. Dial-out calls cannot be placed until the Multilink dial-in call ends. Multilink PPP is disabled by default.

In order for Multilink to work, the Channels allocated for Dial-In ﬁeld must be set to 2.

3COM Dual 56K User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Important Safety Information

Wichtige Sicherheits-Informatio nen

Important Notice de Securite

Medidas de Seguridad Importantes

Informazioni Importanti per la Sicurezza

Additional Safety Information

ABOUT THIS GUIDE

Introduction This guide tells you how to install and conﬁgure the Dual 56K LAN Modem and

Conventions Table 2 and Table 3 list conventions that are used throughout this guide.

Year 2000 Compliance The OfﬁceConnect LAN Modem is Year 2000 compliant. Speciﬁcally, its system

INTRODUCTION

Introduction The Dual 56K LAN Modem is an easy-to-install, Local Area Network (LAN) to Wide

Applications The primary applications for the Dual 56K LAN Modem are:

Hardware Description The following is an overview of the Dual 56K LAN Modem hardware, including the

Features Ease of Installation and Use

LAN Side Connectivity: Installing an Ethernet Hub

Wan Side: The Two 56K Modems

Using the Modem Channels

Dial-in Functionality 25

Understanding Multilink PPP and Other Line Usage Options

The Virtual FAX Modem (Windows 95, 98, NT, and 2000)

Support for Virtual Private Networks (VPNs)

BEFORE YOU BEGIN

Package Contents Your Dual 56K LAN Modem package should contain all of the items shown:

Before You Begin In order to install and conﬁgure your Dual 56K LAN Modem, you should already

Why Check TCP/IP and IP Address Settings?

Checking TCP/IP and IP Address Settings

Adding TCP/IP to Your Protocols List

Setting Up Your Computer If You Have a Static IP Address

Before You Start the Installation

Changing the LAN Modem IP Address for Static IP Users

The LAN Modem Main Configuration Page 53

Connecting an External Hub to the Dual 56K LAN Modem

Changing the LAN Modem IP Address for Static IP Users

The LAN Modem Support Web Site

ADVANCED CONFIGURATION

Associating Service Providers with Workstations on the LAN

Using a Connection Script

Configuring LAN Parameters 81

Configuring V.90 Modem Control Parameters 83

Changing Data Call Parameters

Specifying a WINS Server Address

Reserving DHCP Addresses

Changing Your Password

Using Selective Password Protection

Checking for Dual 56K LAN Modem upgrades

Understanding Dial-in Basics

Part I. Configuring the Server-side Dual 56K LAN Modem for Dial-in Support 99