3COM 3C840 User Manual

OfficeConnect™ Remote

840 SDSL Router User’s Guide

Release 1.2.0

http://www.3com.com/

Part No. 10031396 Rev. AA

May 2000

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

Copyright © 1998, 3Com Corporation. 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 written 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, term, or condition of any kind, either implied or expressed, including, but not limited to, the implied warranties, terms or conditions of merchantability, satisfactory quality, 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.

If there is any software on removable media described in this documentation, it is furnished under a license agreement included with the product as a separate document, in the hard copy documentation, or on the removable media in a directory file named LICENSE.TXT or !LICENSE.TXT. If you are unable to locate a copy, please contact 3Com and a copy will be provided to you.

UNITED STATES GOVERNMENT LEGEND

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

All technical data and computer software are commercial in nature and developed solely at private expense. Software is delivered as “Commercial Computer Software” as defined in DFARS 252.227-7014 (June 1995) or as a “commercial item” as defined in FAR 2.101(a) and as such is provided with only such rights as are provided in 3Com’s standard commercial license for the Software. Technical data is provided with limited rights only as provided in DFAR 252.227-7015 (Nov 1995) or FAR 52.227-14 (June 1987), whichever is applicable. You agree not to remove or deface any portion of any legend provided on any licensed program or documentation contained in, or delivered to you in conjunction with, this User Guide.

Portions of this documentation are reproduced in whole or in part with permission from (as appropriate).

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

3Com, the 3Com logo, Boundary Routing, EtherDisk, EtherLink, EtherLink II, LANsentry, LinkBuilder, Net Age, NETBuilder, NETBuilder II, OfficeConnect, Parallel Tasking, SmartAgent, SuperStack, TokenDisk, TokenLink, Transcend, and ViewBuilder are registered trademarks of 3Com Corporation. ATMLink, AutoLink, CoreBuilder, DynamicAccess, FDDILink, NetProbe, PACE and Total Control are trademarks of 3Com Corporation. 3ComFacts is a service mark of 3Com Corporation.

Artisoft and LANtastic are registered trademarks of Artisoft, Inc. Banyan and VINES are registered trademarks of Banyan Systems Incorporated. CompuServe is a registered trademark of CompuServe Interactive Services, Inc. DEC and PATHWORKS are registered trademarks of Digital Equipment Corporation. Intel and Pentium are registered trademarks of Intel Corporation. AIX, AT, IBM, NetView, and OS/2 are registered trademarks and Warp is a trademark of International Business Machines Corporation. Microsoft, MS-DOS, Windows, and Windows NT are registered trademarks of Microsoft Corporation. Novell and NetWare are registered trademarks of Novell, Inc. PictureTel is a registered trademark of PictureTel Corporation. UNIX is a registered trademark of X/Open Company, Ltd. in the United States and other countries.

All other company and product names may be trademarks of the respective companies with which they are associated.

BOUT THIS GUIDE

Introduction 1 How to Use This Guide 2 Conventions 2 Document Notation 3 Safety Information 4

Additional Safety Information 5

Year 2000 Compliance 5

VERVIEW

Introduction 1 - 1 What Is the OfficeConnect Remote 840? 1 - 2 What is an SDSL Modem? 1 - 3 What is ATM? 1 - 3 What is Frame Relay? 1 - 3 What is a BRouter? 1 - 4

Routing vs. Bridging 1 - 4

MAC-Encapsulated Routing 1 - 4 What is a Remote Site? 1 - 5 What is RFC 1483 1 - 6

Benefits of Using RFC 1483 1 - 7 What is RFC 1490? 1 - 7 What is PPP? 1 - 7

Benefits of Using PPP 1 - 7 What is DHCP? 1 - 7 What is DNS? 1 - 8 What is Address Translation? 1 - 8 What is DHCP Smart Mode? 1 - 8 What Is Default Bridge Mode? 1 - 9

What is Unconfigured Mode? 1 - 9 Getting Started Quickly 1 - 9 OfficeConnect Remote 840 Panel Features 1 - 10

Front Panel 1 - 10

Back Panel 1 - 11

Configuration Overview 1 - 13

General Configuration Steps 1 - 13 How to Manage the OfficeConnect Remote 840 1 - 14 Starting the OfficeConnect Remote 840 Manager 1 - 15 OfficeConnect Remote 840 Manager Menus 1 - 15 Using the OfficeConnect Remote 840 Manager 1 - 16

Document Notation 1 - 16

Online Help 1 - 17 Where to Find More Configuration Information 1 - 17

YSTEM ADMINISTRATION

Performing System Administration Tasks 2 - 1 Controlling Login and Telnet Access 2 - 1

Adding a Login 2 - 2

Deleting a Login 2 - 2 Modifying the Date and Time 2 - 3 Restoring Factory Defaults 2 - 3 Using the OfficeConnect Remote 840 Manager to Restore Defaults 2 - 4

Using the Reset Button 2 - 4 Updating OfficeConnect Remote 840 Software 2 - 4 Controlling SNMP Access 2 - 4 Controlling TFTP Access 2 - 6 Assigning SNMP Trap Managers 2 - 7 Assigning Syslog Managers 2 - 8

EMOTE SITE MANAGEMENT

Introduction 3 - 1 Remote Site Overview 3 - 1 Managing a Remote Site Profile 3 - 2

Adding a Remote Site Profile 3 - 2 Modifying a Remote Site Profile 3 - 3 Deleting a Remote Site Profile 3 - 3

Configuring Network Service Information (PPP / RFC 1483 / RFC 1490) 3 - 4

Frame Relay 3 - 5

Configuring ATM Information 3 - 6

ATM Modify Screen 3 - 6 Configuring Protocol Parameters 3 - 8 Monitoring Remote Site Connections 3 - 8

ONFIGURING

Introduction 4 - 1 Overview 4 - 1 Enabling IP Routing 4 - 2 Configuring IP for the LAN 4 - 2

Adding a Local IP Network 4 - 3

Resetting Parameters 4 - 4

Modifying or Deleting an IP Network 4 - 4 Configuring IP RIP on the LAN 4 - 5

Local Site (LAN) RIP 4 - 5

Advanced RIP Modification Options 4 - 5

Resetting Parameters 4 - 6 Configuring IP for the Remote Site Connection 4 - 7

Configuring IP Parameters for the Remote Site 4 - 7

Configure the Remote Site IP Network Information 4 - 8 Configuring IP RIP on a Remote Site 4 - 10 Configuring IP Static and Framed Routes 4 - 11

Adding a Static IP Route to the LAN 4 - 11

Adding a Framed IP Route to a Remote Site 4 - 11 Using IP Address Validation 4 - 12

MAC-Encapsulated Routing 4 - 13 Monitoring 4 - 14 IP Testing (PING) 4 - 14

Option 1: OfficeConnect Remote 840 Manager Ping to ISP or Remote Site Network 4 - 14

IP R

OUTING

Ping Responses 4 - 15 DNS Errors 4 - 15 Option 2: DOS Ping to ISP or Remote Site Network 4 - 16 Option 3: Internet Browser (Internet Access Only) 4 - 17 Advanced Troubleshooting 4 - 17

ONFIGURING BRIDGING

Introduction 5 - 1 Overview 5 - 1 Configuring Bridging for the LAN 5 - 3

Adding a Bridge Network 5 - 3 Modifying or Deleting a Bridge Network 5 - 4

Configuring Bridging for the Remote Site Connections 5 - 4

Enabling Bridging 5 - 5 Bridging IP Traffic 5 - 5 MAC-Encapsulated Routing 5 - 6 Bridge Firewall 5 - 7 Advanced Bridging Options 5 - 9 Default Bridge Mode 5 - 10

Default Bridge Mode Overview 5 - 10

Installing the OfficeConnect Remote 840 Using Default Bridge Mode 5 - 11 Monitoring Bridging 5 - 11

Viewing Bridge Network Status 5 - 11

Viewing Bridge Forwarding Table 5 - 11

Viewing Bridge Counters 5 - 11 Testing Bridging 5 - 11

ETWORK ADDRESS TRANSLATION USING THE OFFICECONNECT REMOTE

Introduction 6 - 1 Selecting Address Translation 6 - 1

840

Configuring the PAT Default Address 6 - 2 Configuring Static PAT Port Entries 6 - 3 Configuring NAT 6 - 4 Monitoring 6 - 5

ONFIGURING

Introduction 7 -1 DHCP Overview 7 -1 Configuring the DHCP Mode 7 -2 Configuring the DHCP Server 7 -3 Configuring the DHCP Relay 7 -4 Monitoring DHCP 7 -4 DHCP Smart Mode Overview 7 -4

DHCP

ONFIGURING

Introduction 8 - 1 DNS Overview 8 - 1 Configuring DNS 8 - 2 Configuring Remote DNS Servers 8 - 2 Configuring Static DNS Host Entries 8 - 4

ONFIGURING

Introduction 9 - 1 Overview 9 - 1 Configuring IPX for the LAN 9 - 2

Adding a Local IPX Network 9 - 2 Modifying or Deleting an IPX Network 9 - 3

DNS

IPX R

OUTING

Configuring IPX for Remote Sites Connection 9 - 3

Configure the Remote Site IPX Network Information 9 - 4 Configuring IPX Static and Framed Routes 9 - 5

Adding a Static IPX Route to the Local Site (LAN) 9 - 5

Adding a Framed IPX Route to a Remote Site (WAN) 9 - 6 Configuring IPX Static and Framed Services 9 - 7

Adding a Static IPX Service to a Local Site (LAN) 9 - 8

Adding a Framed IPX Service to a Remote Site (WAN) 9 - 9 Configuring IPX RIP and SAP 9 - 10

Local Site (LAN) RIP and SAP 9 - 10

Remote Site (WAN) RIP and SAP 9 - 11

IPX Routing Configuration to Support MAC-Encapsulated Routing 9 - 12 Monitoring IPX 9 - 12 IPX Testing 9 - 12

PGRADING OPERATIONAL SOFTWARE FOR THE OFFICECONNECT REMOTE

Introduction 10 - 1 Obtaining Updated OfficeConnect Remote 840 Software 10 - 1

OfficeConnect Remote 840 CD 10 - 2 Installing Operational Software to the OfficeConnect Remote 840 Unit 10 - 2

Installing Software via OfficeConnect Remote 840 Manager 10 - 2

Installing Software via DOS 10 - 3

840

ONITORING THE OFFICECONNECT REMOTE

Introduction 11 - 1 Overview 11 - 1 Throughput Performance 11 - 1 Ethernet Interface 11 - 3

Interface Status 11 - 3

Ethernet Counters 11 - 4

840

11 - 5

Interface Status 11 - 5

ATM Status 11 - 5 ATM Cell Status 11 - 5 SDSL Transceiver Status 11 - 6

Remote Site Connection 11 - 7

Connection Traffic/Error Counters 11 - 7 ATM Site Counters 11 - 7 Frame Relay VC Site Counters 11 - 8 Remote Site Status Table 11 - 8

IP 11 - 8

IP Networks 11 - 8 ARP Table 11 - 9 IP, TCP, UDP, ICMP Counters and Tables 11 - 10

DHCP 11 - 10

DHCP Lease Table 11 - 10 DHCP Counters 11 - 11

Address Translation 11 - 11

Table of Mapped Addresses 11 - 11 Table of Port Assignments 11 - 12

IPX 11 - 13

IPX Networks 11 - 13 IPX Routes 11 - 13 IPX Services 11 - 14

Bridge 11 - 14

Bridge Networks 11 - 14 Forwarding Table 11 - 15 Bridge Counters 11 - 15

Events Logs 11 - 15

Connection Event Log 11 - 16 Critical Events Log 11 - 16

ONFIGURING FILTERS

Introduction 12 - 1

Filtering Overview 12 - 1 Filtering Capabilities 12 - 2

Filter Classes 12 - 2

Filter Types 12 - 2

Data Filters 12 - 2

Advertisement Filters 12 - 3

Generic Filters 12 - 3 Creating Filters Overview 12 - 4 Creating Filters Using the OfficeConnect Remote 840 Manager 12 - 4

OfficeConnect Remote 840 Manager Filter Screens 12 - 6

Filter Screens 12 - 7

12 - 9 12 - 9

Step-by-Step Guide to Creating Filters Using the OfficeConnect Remote 840 Manager 12 - 12

Modifying an Existing Filter Using the OfficeConnect Remote 840 Manager 12 - 13

Turning a Filter Off Using the OfficeConnect Remote 840 Manager 12 - 13

ROUBLESHOOTING

Introduction 13 - 1 Troubleshooting Tools 13 - 1

Troubleshooting Tables 13 - 2

How to Use these Tables 13 - 2 LAN Connection Problems 13 - 3 IP Wizard and Web Browser Problems 13 - 3 WAN Connection Problems 13 - 6 General Network Connection Problems 13 - 7 IP Network Connection Problems 13 - 9 IPX Network Connection Problems 13 - 12 Bridge Connection Problems 13 - 13

RIDGING AND ROUTING

Introduction A -1 Bridging and Routing Concepts A -1

Guidelines for Choosing Bridging or Routing A -2

How Bridges Learn A -2

Bridging Between Remote Sites A -3 Building a Larger Network A -4 Multiple Paths Between Bridge LANs A -5 Network Topology A -6 Broadcast Storms A -6 Optimum Use of Resource A -6

Network Organization, Structure, and Physical Layout A -6

The Internet A -7 Routing IP A -7 Open Systems Interconnection Network Layer Model A -8

IP Routing A -9

DDRESSING

IP A

Introduction to IP Addressing B - 1 IP Addressing Basics B - 1

Address Classes B - 1 Subnetting B - 1 Reserved Addresses B - 2 Supernetting (Advanced TCP/IP) B - 3 Supernetting and the OfficeConnect Remote 840 B - 4 IP Subnet Mask Address B - 5 IP Planning B - 5 Assigning IP Addresses and Subnetting B - 5 Single IP Address B - 6 Range of IP Addresses B - 6 IP Numbered and Unnumbered Links B - 7

DDRESS TRANSLATION TUTORIAL

Overview C -1 Network Address Translation (NAT) C -2

NAT Example C -2

Dynamic NAT C -3

Static NAT C -4 Port Address Translation (PAT) C -4

PAT Example C -4

Dynamic PAT C -5

Static PAT C -5

Default PAT C -6

SING THE

Overview D -1

Accessing the CLI from the OfficeConnect Remote 840 Manager D -1

ONFIGURATION

Instructions for Internet Access E - 1

Step 1: Configuring Remote Site General Information E - 1

Step 2: Configuring the Remote Site ATM Parameters (ATM Only) E - 4

Step 3: Configuring the Remote Site IP Network Information E - 4 Instructions for Telecommuting / Remote Office Access E - 7

Step 1: Configuring Remote Site General Information E - 7

Step 2: Configuring the Remote Site ATM Parameters E - 9

Step 3: Configuring the Remote Site IP Network Information E - 10

Step 4: Configuring the Remote Site IPX Network Information E - 12

Step 5: Configuring a Local IPX Network E - 13

CLI G

UIDE

(NON-S

ETUP WIZARD) OF THE OFFICECONNECT REMOTE

840

Step 6: Configuring a Local Bridge Network E - 13 Using the Configuration Audit E - 13 Saving the Configuration E - 14 Testing the Configuration E - 14

TECHNICAL SUPPORT

Online Technical Services F - 1

World Wide Web Site F - 1 Support from Your Network Supplier F - 1 Support from 3Com F - 2 Returning Products for Repair F - 2

3COM C

FCC C

FCC D

LASS

ECLARATION OF CONFORMITY

ORPORATION LIMITED WARRANTY

TATEMENT

B S

BOUT THIS

UIDE

Introduction

This guide describes the features and advanced configuration of the OfficeConnectRemote 840 SDSL Router. The guide is intended for both first-time and experienced computer network users who are using the OfficeConnectRemote 840.

For information on the initial configuration of the unit, see the OfficeConnect Remote 840 SDSL Router Installation Guide (included in the box when your purchased your Router). That guide contains steps to get the user started accessing the Internet or telecommuting to a remote office.

This OfficeConnectRemote 840 SDSL Router User's Guide is intended to be used for advanced configuration, presenting more detailed information on the unit.

First-time users may want to read the tutorials in this Guide to help you learn more about the networking technologies used by the OfficeConnectRemote 840 SDSL Router.

The appendixes describe how to set up your router without using the Setup Wizard.

BOUT THIS GUIDE

How to Use This Guide

This table shows where to find specific information in this guide.

If you are looking for: Turn to:

OfficeConnect Remote 840 Product Overview and Configuration

Configuration of your Router (Remote Sites, IP Routing, Bridging, NAT, DHCP, DNS, IPX Routing)

Upgrading Software Chapter 10

Monitoring Capabilities Chapter 11

Configuring Filters Chapter 12

Troubleshooting Chapter 13

Information on the difference between Bridging and RoutingAppendix A

Information about IP Addressing Appendix B

Information on Address Translation Appendix C

Information on using the CLI Guide Appendix D

Information on Configuration Appendix E

Information on Technical Support Appendix F

Chapters 1, 2

Chapter 3 – 9

These and other user guides and release notes are available in Adobe Acrobat Reader Portable Document Format (PDF) or HTML on the 3Com World Wide Web site:

Conventions

http://www.3com.com/ocr840

Table 1 and Table 2 list conventions that are used throughout this guide.

Table 1 Notice Icons

Icon Notice Type Description

Information note Information that describes important features or

instructions

Caution Information that alerts you to potential loss of data or

potential damage to an application, system, or device

Warning Information that alerts you to potential personal injury

Document Notation

Table 2 Text Convention

Convention Description

Screen displays

Syntax

Commands

The words “enter” and “type”

Keyboard key names If you must press two or more keys simultaneously, the key

Words in

italics

This typeface represents information as it appears on the screen.

The word “syntax” means that you must evaluate the syntax provided and then supply the appropriate values for the placeholders that appear in angle brackets. Example:

To add a login user, use the following syntax:

Add user <name> password <password>

In this example, you must supply a user name for <name> and a password for <password>.

The word “command” means that you must enter the command exactly as shown and then press Return or Enter. Commands appear in bold. Example:

To view the current login users, use the command:

list users

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

names are linked with a plus sign (+). Example:

Press Ctrl+Alt+Del

Italics are used to:

■

Emphasize a point.

■

Denote a new term at the place where it is defined in the text.

■

Identify menu names, menu commands, and software button names. Examples:

From the

Click OK.

Help

menu, select

Contents

Document Notation

References to specific OfficeConnect Remote 840 Manager pages in this document will use a specific notation to describe the location of a page relative to the OfficeConnect Remote 840 Manager home page. The notation uses the' >' character to indicate that a sub-menu on a page must be accessed.

For example, to monitor the IP ARP Table you would (starting from the home page) access the Monitor menu. From the Monitor menu you would access the Networks sub-menu. From the Networks sub-menu you

BOUT THIS GUIDE

would access the IP sub-menu. Finally, from the IP sub-menu, you would access the ARP Table page. This is specified as Monitor > Networks > IP > ARP Table.

When accessing a page that requires data entry, press the Help icon displayed in the Main area to obtain information about the each data field on the page.

Safety Information

When using the unit, observe the following safety information:

■

Retain this user guide for later use and pass it on to subsequent owners/managers of the unit.

■

The power adapter supplied with the unit is fitted with a molded plug for connection to a standard electrical mains system supply socket. If this plug is not suitable for connection to your mains supply, contact your reseller for advice. Do not attempt to connect to the mains supply using an inappropriate mains adapter.

■

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 3Com are safe and without risk provided they are installed, used, and maintained in good working order and in accordance with their instructions and recommendations.

■

Should 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.

■

If the case is damaged.

■

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

■

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

■

Never install telephone wires during a thunder storm, or install telephone connection 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 disconnected at the network interface. Always exercise caution when installing or modifying telephone lines.

■

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

Year 2000 Compliance

■

Do not use a telephone that is connected to the unit (other than a cordless type) during an electrical storm. There may be a remote risk of electric shock from lightning.

■

Do not spill food or liquids on the unit. If the unit gets wet, isolate the electrical supply and contact your 3Com reseller.

■

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

■

Ensure nothing rests on the unit's system cables and that the cables are not located where they can be stepped on and cause damage to the unit.

■

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

■

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

■

The unit has been designed to be a free standing unit. Do not place anything else on top of the unit's case.

■

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

Additional Safety

Information

Year 2000 Compliance

■

This unit contains a lithium battery which is attached to a microchip on the printed circuit board. The defective battery must be disposed of safely in accordance with the manufacturers instructions.

Cette unité contient une pile au lithium attachée à une puce sur la carte à circuit imprimé. Se débarrasser de la pile défectueuse en toute sécurité conformément aux instructions du fabricant.

See the printed installation guide for additional important safety information.

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

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

BOUT THIS GUIDE

VERVIEW

Introduction

This chapter provides an overview of the OfficeConnect Remote 840. It contains the following sections:

■

“What Is the OfficeConnect Remote 840?”

■

“What is an SDSL Modem?”

■

“What is ATM?”

■

“What is Frame Relay?”

■

“What is a BRouter?”

■

“What is a Remote Site?”

■

“What is RFC 1483”

■

“What is RFC 1490?”

■

“What is PPP?”

■

“What is DHCP?”

■

“What is DNS?”

■

“What is Address Translation?”

■

“What is DHCP Smart Mode?”

■

“What Is Default Bridge Mode?”

■

“Getting Started Quickly”

■

“OfficeConnect Remote 840 Panel Features”

■

“Configuration Overview”

■

“How to Manage the OfficeConnect Remote 840”

■

“Starting the OfficeConnect Remote 840 Manager”

■

“Using the OfficeConnect Remote 840 Manager”

■

“Online Help”

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■

“Where to Find More Configuration Information”

What Is the OfficeConnect Remote 840?

The OfficeConnect Remote 840 is a stand-alone BRouter with data interfaces to a Local Area Network (LAN) and a Wide Area Network (WAN). The Symmetric Digital Subscriber Line (SDSL) port composes the WAN interface, which can support Point-to-Point protocol (PPP), RFC 1483, or RFC 1490 connections. The LAN port is a twisted-pair Ethernet 10Base-T interface. Additionally, the OfficeConnect Remote 840 has a standard serial interface console port.

The OfficeConnect Remote 840 allows one or more networked workstations to connect to other computers on a remote LAN. Once connected, local users (a local branch office) can communicate with remote computers (the main office) as if they were connected locally (see the figure below). The OfficeConnect Remote 840 moves data back and forth quickly, and accesses any program or file you would ordinarily use on the network.

Local LAN

OfficeConnect Remote

840 SDSL Router

HTML

Management

ATM

Frame Relay

Edge

Router

Edge

Router

Internet

Remote

Office

Figure 1–1 Connection to Remote Networks

The OfficeConnect Remote 840 can provide high-speed access to the Internet.

The OfficeConnect Remote 840 provides static and dynamic routing of the Internet Protocol (IP) and Internetwork Packet Exchange (IPX)

What is an SDSL Modem?

1-3

protocols as well as bridging, with support for learning bridge and

802.1d spanning tree functionality to eliminate loops. Other important features include: Routing Information Protocol (RIP), Simple Network Management Protocol (SNMP), address translation, telnet, and packet filtering. The web browser-based OfficeConnect Remote 840 Manager and the IP Wizard provide a user-friendly configuration interface.

To simplify the installation process, the OfficeConnect Remote 840 can be initialized with pre-configured parameters using DIP switches located on the back of the unit. There are three operational modes: DHCP Smart Mode, Default Bridge Mode, and Unconfigured Mode.

What is an SDSL Modem?

What is ATM?

An SDSL modem is a device that transmits and receives data through regular telephone lines at speeds that far exceed traditional analog modem technology.

It allows your workstation to connect to a remote site using a network protocol such as IP or IPX. The OfficeConnect Remote 840 contains one SDSL modem port which is the WAN interface.

Asynchronous Transfer Mode (ATM) is a modern networking technology that provides support for a wide variety of services and applications. The OfficeConnect Remote 840 provides support for ATM over SDSL.

ATM is based on the transfer of fixed-length cells containing a header and an information field. The header is used to route the cells through the ATM network backbone.

ATM defines connections by two main parameters, which are explained later in this Guide:

■

Virtual Path Identifier (VPI)

■

Virtual Channel Identifier (VCI).

What is Frame Relay?

Frame Relay is a framed-based technology that runs over HDLC (High Level Data Link Control). Virtual Circuits are defined which connect the OfficeConnect Remote 840 to up to 16 remote sites within a Frame Relay Network. Each Virtual Circuit is identified by a Data Link Connection Identifier (DLCI), which is included in the frame header.

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What is a BRouter?

A BRouter is an interface between two networks, functioning as a router and/or a bridge. A router finds the best route between networks and provides network management capabilities. The OfficeConnect Remote 840 is a protocol independent router that does not rely on the workstations on a LAN for routing information, such as the destination location and best route.

Routing vs. Bridging Routers forward packets based on network-level addresses. Bridges

forward packets based on hardware-level, or media access control (MAC) addresses. In other words, when a router receives a packet from one port, it looks at the destination network level address (for example, the IP address) to determine which port to forward the packet to. When a bridge receives a packet from one port, it looks at the destination MAC address to determine which port to forward the packet to.

In each case, the unit maintains either a forwarding table (bridges) or a routing table (routers) that contains information about which port to use to reach the destination address. These tables are for the most part maintained automatically by the unit so the administrator does not have to add or delete entries as the network topology changes.

An example illustrating the difference between bridges and routers would be the case where both a bridge and a router have tables with 256 entries. Because the bridge forwards based on MAC address, it can know about the location of 256 MAC addresses (physical machines such as workstations, servers, etc.). The router can know about the location of 256 networks, where each network can contain many physical machines.

MAC-Encapsulated

Routing

Bridges make forwarding decisions based on destination addresses, while routers makes forwarding decisions based on networks to which destination addresses belong. Therefore, routers are more efficient and capable of handling more traffic.

The OfficeConnect Remote 840 provides a Bridge Firewall function which allows flexible configuration of simultaneous bridging and routing. For more information on the Bridge Firewall, see Appendix A, “Bridging and

Routing”.

MAC-Encapsulated Routing enables the OfficeConnect Remote 840 to function as a router but to work in a bridged environment. When enabled, the network level addresses are used for forwarding, but the

What is a Remote Site?

1-5

MAC layer addresses are pre-pended in the ethernet header over the Wide Area Connections. Address Resolution procedures (ARP), are used to dynamically learn the MAC address of the remote router.

What is a Remote Site?

The OfficeConnect Remote 840 can be configured to route IP or IPX, and/or bridge other protocols between workstations on the Local Area Network (LAN) and up to 16 remote locations over an ATM or Frame Relay Wide Area Network (WAN). This is illustrated in the diagram below, showing the local LAN simultaneously connected to a remote office and the Internet.

Local LAN

OfficeConnect Remote

840 SDSL Router

HTML

Management

ATM

Frame Relay

Edge

Router

Edge

Router

Internet

Remote

Office

Figure 1–2 Connection to a Remote Internet Network

Data is transmitted to and from remote sites through ATM or Frame Relay. With ATM, each VC has a configured Quality of Service (QOS) and is identified by a Virtual Path Identifier (VPI) and a Virtual Channel Identifier (VCI). With Frame Relay, each Virtual Circuit is identified by a DLCI. Obtain these parameters from your Service Provider.

The data is framed in either PPP, RFC 1483 or RFC 1490 encapsulation, which also is specified by your Service Provider.

The IP, IPX, and bridge protocols transmit over the ATM VCs. When a remote site is configured to route IP, there will be a corresponding remote network IP subnet address and (optionally) a local WAN interface address

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within the same subnet. When the local side of the WAN interface has an assigned address, it is referred to as being "numbered." Otherwise, it is referred to as "unnumbered."

For a more in-depth description of “numbered” versus “unnumbered” interfaces, see Appendix B, “IP Addressing”

When PPP is used, both the local and remote WAN addresses can by dynamically learned. Otherwise, they must be specified. The diagram below shows a OfficeConnect Remote 840 with 3 VCs and the corresponding IP addresses.

When PPP is used, both the local and remote WAN addresses can by dynamically learned. Otherwise, they must be specified. The diagram below shows an OfficeConnect Remote 840 with 3 VCs and the corresponding IP addresses.

What is RFC 1483

Figure 1–3 Connection with Three Virtual Circuits (VCs)

RFC 1483 is a protocol standard that describes two encapsulations methods for carrying network interconnect (Bridging and Routing) traffic over ATM AAL5.

RFC 1483 is a single-link interface between two packet-switching devices, such as a bridge or router. An RFC 1483 link may be created between the OfficeConnect Remote 840 and a remote router after they establish a

What is RFC 1490?

connection. RFC 1483 is a conduit for multiple protocols such as IP and IPX, which are encapsulated and passed across the communications datalink.

The OfficeConnect Remote 840 supports RFC 1483 and can establish a RFC 1483 connection to other devices supporting RFC 1483.

1-7

Benefits of Using RFC

1483

What is RFC 1490?

What is PPP?

RFC 1483 offers interoperability of multi-vendor equipment and identification and aggregation of multiple protocol packets into one data stream.

It is a protocol standard that describes an encapsulation method for carrying network interconnect traffic over a Frame Relay backbone. It covers aspects of both Bridging and Routing.

The OfficeConnect Remote 840 supports RFC 1490 and can establish a RFC 1490 connection to other devices supporting RFC 1490.

The Point-to-Point Protocol (PPP) is a WAN protocol. It is a single or multi-link interface between two packet switching devices, such as a bridge or router. A PPP link may be created between the OfficeConnect Remote 840 and a remote router after they connect. PPP is an efficient conduit for multiple protocols such as IP and IPX, which are encapsulated across the communications datalink.

PPP provides built-in negotiation for addresses and connection parameters, and it can route multiple protocols over a single link.

The OfficeConnect Remote 840 supports PPP and can establish a PPP connection to other devices supporting PPP.

Benefits of Using PPP PPP offers interoperability of multi-vendor equipment, and support for

dynamic configuration between the connecting devices.

What is DHCP?

Dynamic Host Configuration Protocol (DHCP) is designed to provide a centralized approach to configuring IP addresses and parameters.

When a workstation is configured for automatic assignment of IP addresses, it broadcasts a request on the LAN. The DHCP Server responds

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with an IP address for the workstation and the IP addresses of the default router and Domain Name Server.

The OfficeConnect Remote 840 can be configured to be a DHCP Server, with a pool of up to 40 IP addresses.

What is DNS?

What is Address Translation?

A Domain Name Server (DNS) provides an IP address to a host computer for a given domain name. A DNS Proxy receives requests and attempts to find an entry in its local tables, and if one is not found, forwards the request to a remote DNS Server. The remote DNS Server can be learned dynamically through PPP or can be statically assigned.

The OfficeConnect Remote 840 can be configured as a DNS proxy. A static local host entry of ocrdsl-3com.com is configured for the OfficeConnect Remote 840 by default. Therefore, the OfficeConnect Remote 840 can be easily accessed with a web browser, by typing in ocrdsl-3com.com in the location or address field in the browser.

In unconfigured mode, ocrdsl-3com.com is not configured by default. In this mode, you will have to configure a static host entry.

Address Translation allows private network addresses to be mapped into public addresses. The OfficeConnect Remote 840 provides two methods for mapping private, non-registered LAN IP addresses to the public Internet address(es) used for a wide-area connection. The two methods are:

■

Network Address Translation (NAT). NAT simply substitutes public IP addresses for private IP addresses.

What is DHCP Smart Mode?

■

Port Address Translation (PAT). PAT allows sessions from multiple private IP addresses to use a single public IP address.

NAT and PAT can be configured for each remote site.

To simplify the installation process, the OfficeConnect Remote 840 can be initialized with a set of pre-configured parameters. This operational mode is referred to as DHCP Smart Mode. In DHCP Smart Mode, the unit will automatically be assigned an IP address and will provide a pool of IP addresses to be assigned to each workstation attached to the LAN. When

What Is Default Bridge Mode?

you choose this boot option, you will set up your workstation(s) for automatic IP address assignment.

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What Is Default Bridge Mode?

What is Unconfigured

Mode?

Getting Started Quickly

The second operational mode is Default Bridge Mode. This mode preconfigures the unit to bridge all packets. The unit can be automatically set up so that you will not be required to fill out any forms, use Setup Wizard, or install any software from the CD unless you want to change the configuration.

Unconfigured Mode allows you to set all configuration parameters yourself. You can configure it using Command Line Interface (CLI) (see the OfficeConnect Remote 840 CLI User’s Guide), or the Web-based OfficeConnect Remote 840 Manager.

The features described above can be utilized to make configuring the OfficeConnect Remote 840 very easy.

■

Use DHCP Smart Mode to preconfigure a LAN IP address, the DHCP pool of addresses, and the DNS information for the LAN workstations.

■

Use Default Bridge Mode to have the unit automatically bridge all packets. No software installation is required.

■

Use PPP to allow the OfficeConnect Remote 840 to automatically learn the WAN IP addresses and DNS information.

■

Use PAT to allow the workstations on the LAN to share a single IP address when accessing the Internet or a remote office.

Use these features together and all you will need to do is enter authentication and ATM information for your remote site IP connection. Or:

■

Use Default Bridge Mode to have the unit automatically bridge all packets. No software installation or configuration is required.

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OfficeConnect Remote 840 Panel Features

Front Panel Below is a representation of the front panel of your unit:

All LED and status information can be found on the front panel of the unit, while the power jack and ports are located on the back of the unit.

Figure 1–4 OfficeConnect Remote 840 Front Panel

Table 1–1 LED definitions

LED Status Meaning

Alert FLASHING RED When software is initializing

Power STEADY GREEN When power is applied to the unit

SDSL Link Status OFF No signal detected

FLASHING ORANGE The unit is attempting to acquire

STEADY GREEN Link is up.

FLASHING GREEN When data is being sent over the link.

LAN Status (4) STEADY GREEN When a client is connected to the

synchronization with the CO equipment.

corresponding port on the hub.

A table of LED operation is provided in Chapter 3 of the OfficeConnect

Remote 840 SDSL Router Installation Guide in the section “Installing The OfficeConnect Remote 840.”

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