3COM 3CRWE52196 User Manual

OfficeConnect®

Cable/DSL Gateway
Wireless Cable/DSL Gateway
User Guide

3C857
3CRWE52196

(3CRWE52196 Only)

http://www.3com.com/

Part No. DUA0085-5AAA04
Published October 2002

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

Copyright © 2002, 3Com Technologies. All rights reserved. No part of this documentation may be reproduced
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If you are a United States government agency, then this documentation and the software described herein are
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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
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be registered in other countries.

3Com, OfficeConnect and the 3Com logo are registered trademarks of 3Com Corporation.
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CONTENTS

ABOUT THIS GUIDE

Naming Convention 7
Conventions 8

Feedback about this User Guide 8
Related Documentation 9
Product Registration 9

1 INTRODUCING THE GATEWAY

OfficeConnect Cable/DSL Gateway and Wireless Cable/DSL Gateway 11
Gateway Advantages 13
Package Contents 13
Minimum System and Component Requirements 14
Front Panel 14
Rear Panel 16

2 HARDWARE INSTALLATION

Introduction 19

Safety Information 19

Positioning the Gateway 19

Using the Rubber Feet 20
Wall Mounting 20
Before you Install your Gateway 21
Powering Up the Gateway 22
Connecting the Gateway 22

Wireless Only 23

3 SETTING UP YOUR COMPUTERS

Obtaining an IP Address Automatically 25

Windows 2000 25

Windows XP 27

Windows 95/98/ME 27

Macintosh 27
Disabling PPPoE and PPTP Client Software 28
Disabling Web Proxy 28

4 RUNNING THE SETUP WIZARD

Accessing the Wizard 29

Password 32

Time Zone 32

WAN Settings 33

LAN Settings 38

DHCP 38

Wireless Settings 39

Summary 40

5 GATEWAY CONFIGURATION

Navigating Through the Gateway Configuration Pages 41

Main Menu 41

Option Tabs 42
Welcome Screen 42

Notice Board 43

Password 43

Wizard 44
LAN Settings 44

Unit Configuration 44

DHCP Clients List 45
Wireless Settings 46

Configuration 46

Encryption 48

Connection Control 50

Client List 53

Profile 53
Internet Settings 55

Connection to ISP 56
Firewall 61

Virtual Servers 61

Special Applications 63

PC Privileges 65
Security 67

System Tools 69

Restart 69
Time Zone 69
Configuration 70
Upgrade 71

Status and Logs 72

Status 73
Logs 73
Support 73

6 TROUBLESHOOTING

Basic Connection Checks 75
Browsing to the Gateway Configuration Screens 75
Connecting to the Internet 76
Forgotten Password and Reset to Factory Defaults 76
Wireless Networking 77
Alert LED 79
Recovering from Corrupted Software 79
Frequently Asked Questions 80

A USING DISCOVERY

Running the Discovery Application 83

Windows Installation (95/98/2000/Me/NT) 83

B IP ADDRESSING

The Internet Protocol Suite 85
Managing the Gateway over the Network 85

IP Addresses and Subnet Masks 85

How does a Device Obtain an IP Address and Subnet Mask? 87

DHCP Addressing 87
Static Addressing 87
Auto-IP Addressing 87

C TECHNICAL SPECIFICATIONS

D SAFETY INFORMATION

E END USER SOFTWARE LICENCE AGREEMENT

F ISP INFORMATION

GLOSSARY

INDEX

REGULATORY NOTICES FOR THE CABLE/DSL GATEWAY

REGULATORY NOTICES FOR THE WIRELESS CABLE/DSL
G

ATEWAY

ABOUT THIS GUIDE

This guide describes how to install and configure the OfficeConnect
Cable/DSL Gateway (3C857) and the OfficeConnect Wireless Cable/DSL
Gateway (3CRWE52196). All procedures in this guide apply to both
Gateways except when stated.

This guide is intended for use by those responsible for installing and
setting up network equipment; consequently, it assumes a basic working
knowledge of LANs (Local Area Networks) and Internet gateway systems.

If a release note is shipped with the OfficeConnect Cable/DSL Gateway or
OfficeConnect Wireless Cable/DSL Gateway and contains information
that differs from the information in this guide, follow the information in
the release note.

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

http://www.3com.com

Naming Convention Throughout this guide, the OfficeConnect Cable/DSL Gateway and

OfficeConnect Wireless Cable/DSL Gateway are referred to as the
“Gateway”.

Category 3 and Category 5 Twisted Pair Cables are referred to as Twisted
Pair Cables throughout this guide.

8 ABOUT THIS GUIDE

Conventions Ta bl e 1 and Tab l e 2 list conventions that are used throughout this guide.

Tab le 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.

Tab le 2 Text Conventions

Convention Description

The words “enter”
and “type”

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.”

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

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

Press Ctrl+Alt+Del

Words in italics 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 Help menu, select Contents.
Click OK.

Feedback about this

User Guide

Your suggestions are very important to us. They will help make our
documentation more useful to you. Please e-mail comments about this
document to 3Com at:

[e-mail]

Please include the following information when commenting:

■ Document title

■ Document part number (on the title page)

■ Page number (if appropriate)

Conventions 9

Example:

■ OfficeConnect Cable/DSL Gateway and Wireless Cable/DSL Gateway

User Guide

■ Part Number DUA0085-5AAA04

■ Page 24

Do not use this e-mail address for technical support questions. For
information about contacting Technical Support, please refer to the
Support and Safety Information sheet.

Related

Documentation

In addition to this guide, each Gateway document set includes one
Installation Guide. This guide contains the instructions you need to install
and configure your Gateway.

Product Registration You can now register your Gateway on the 3Com web site and receive

up-to-date information on your product:

http://support.3com.com/registration/frontpg.pl

10 ABOUT THIS GUIDE

1

INTRODUCING THE GATEWAY

Welcome to the world of networking with 3Com®. In the modern
business environment, communication and sharing information is crucial.
Computer networks have proved to be one of the fastest modes of
communication but, until recently, only large businesses could afford the
networking advantage. The OfficeConnect
has changed all this, bringing networks to the small office.

The products that compose the OfficeConnect range give you, the small
office user, the same power, flexibility, and protection that has been
available only to large corporations. Now, you can network the
computers in your office, connect them all to a single Internet outlet, and
harness the combined power of all of your computers.

®

product range from 3Com

OfficeConnect Cable/DSL Gateway and Wireless Cable/DSL Gateway

The OfficeConnect Cable/DSL Gateway and the OfficeConnect Wireless
Cable/DSL Gateway are designed to provide a cost-effective means of
sharing a single broadband Internet connection amongst several wired
and wireless computers. The Gateway also provides protection in the
form of an electronic “firewall” preventing anyone outside of your
network from seeing your files or damaging your computers.

As you can see in the example in Figure 1
computer is connected to the Internet. This computer must always be
powered on for the other computers on the network to access the
Internet.

, without a Gateway only one

12 CHAPTER 1: INTRODUCING THE GATEWAY

Figure 1 Example Network Without a Gateway

When you use the Gateway in your network (Figure 2), it becomes your
connection to the Internet. Connections can be made directly to the
Gateway, or to an OfficeConnect Switch or Hub, expanding the number
of computers you can have in your network.

Figure 2 Example Network Using a Wireless Cable/DSL Gateway

Gateway Advantages 13

Gateway Advantages

The advantages of the Gateway include:

■ Shared Internet connection for wired computers. The Wireless

Cable/DSL Gateway also provides shared internet connection to
wireless computers

■ No need for a dedicated, “always on” computer serving as your

Internet connection

■ Cross-platform operation for compatibility with Windows, Unix and

Macintosh computers

■ Easy-to-use, Web-based setup and configuration

■ Provides centralization of all network address settings (DHCP)

■ Acts as a Virtual server to enable remote access to Web, FTP, and other

services on your network

■ Security - Firewall protection against Internet hacker attacks and

encryption to protect wireless network traffic

Package Contents The Gateway kit includes the following items:

■ One OfficeConnect Cable/DSL Gateway or OfficeConnect Wireless

Cable/DSL Gateway

■ One power adapter for use with the Gateway

■ Four rubber feet

■ One Ethernet cable

■ One CD-ROM containing the Gateway Discovery program and this

User Guide

■ Installation Guide

■ One Support and Safety Information Sheet

■ One Warranty Flyer

If any of these items are missing or damaged, please contact your retailer.

14 CHAPTER 1: INTRODUCING THE GATEWAY

Minimum System and Component Requirements

Your Gateway requires that the computer(s) and components in your
network be configured with at least the following:

■ A computer with an operating system that supports TCP/IP

networking protocols (for example Windows 95/98/NT/Me/2000/XP,

Unix, Mac OS 8.5 or higher).

■ An Ethernet 10Mbps or 10/100 Mbps NIC for each computer to be

connected to the four-port switch on your Gateway.

■ An 802.11b wireless NIC (if you are using an OfficeConnect Wireless

Cable/DSL Gateway).

■ A cable modem or DSL modem with an Ethernet port (RJ-45

connector).

■ An active Internet access account.

■ A Web browser program that supports JavaScript, such as Netscape

4.0 or higher or Internet Explorer 5.0 or higher.

Front Panel The front panel of the Gateway contains a series of indicator lights (LEDs)

that help describe the state of various networking and connection
operations.

Figure 3 Gateway - Front Panel

For example purposes only, this graphic shows a Wireless Cable/DSL
Gateway.

1 Alert LED

Orange

Indicates a number of different conditions, as described below.

Off - The Gateway is operating normally.
Flashing quickly - Indicates one of the following conditions:

Front Panel 15

■ The Gateway has just been started up and is running a self-test

routine, or

■ The administrator has invoked the Reset to Factory Defaults

command, or

■ The system software is in the process of being upgraded

In each of these cases, wait until the Gateway has completed the current
operation and the alert LED is Off.

Flashing slowly - The Gateway has completed the Reset to Factory
Defaults process, and is waiting for you to reset the unit. To do this,

remove power, wait 10 seconds and then re-apply power. The Gateway
will then enter the start-up sequence and resume normal operation.

If you have used a cable to reset the unit to Factory Defaults, follow steps
5 to 7 in “

page 76

Forgotten Password and Reset to Factory Defaults” on

.

On for 2 seconds, and then off - The Gateway has detected and

prevented a hacker from attacking your network from the Internet.

Continuously on - A fault has been detected with your Gateway during
the start-up process. Refer to Chapter 6

“Troubleshooting”.

2Power LED

Green

Indicates that the Gateway is powered on.

3 Four LAN Status LEDs

Green (100Mbps link) / yellow (10Mbps link)

If the LED is on, the link between the port and the next piece of network
equipment is OK. If the LED is flashing, the link is OK and data is being
transmitted or received. If the LED is off, nothing is connected, the
connected device is switched off, or there is a problem with the
connection (refer to Chapter 6

“Troubleshooting”). The port will

automatically adjust to the correct speed and duplex.

16 CHAPTER 1: INTRODUCING THE GATEWAY

4 Wireless LAN (WLAN) Status LED

*Available on the OfficeConnect Wireless Cable/DSL Gateway only

Yellow

If the LED is on it indicates that wireless networking is enabled. If the LED
is flashing, data is being transmitted or received. If the LED is off, the
Wireless LAN has been disabled in the Gateway, or there is a problem.
Refer to Chapter 6

“Troubleshooting”.

5 Cable/DSL Status LED

Green (100Mbps link) / yellow (10Mbps link)

If the LED is on, the link between the Gateway and the cable or DSL
modem is OK. If the LED is flashing, the link is OK and data is being
transmitted or received. If the LED is off, nothing is connected, the
modem is switched off or there is a problem (refer to Chapter 6

Troubleshooting”).

“

Rear Panel The rear panel (Figure 4) of the Gateway contains four LAN ports, one

Ethernet Cable/DSL port, and a power adapter socket.

Figure 4 Gateway - Rear Panel

For example purposes only, this graphic shows a Wireless Cable/DSL
Gateway.

6 Wireless Antennae

*Available on the OfficeConnect Wireless Cable/DSL Gateway only

The antennae on the product should be placed in a ‘V’ position when
initially installed.

CAUTION: Do not force the antennae round further than 90 degrees in
either direction.

Rear Panel 17

7 Power Adapter Socket

Only use the power adapter supplied with this Gateway. Do not use any
other adapter.

8 Ethernet Cable/DSL port

Use the supplied patch cable to connect the Gateway to the Ethernet
port on your cable or DSL modem. The port will automatically adjust to
the correct speed and duplex.

9 Four 10/100 LAN ports

Using suitable RJ-45 cable, you can connect your Gateway to a computer,
or to any other piece of equipment that has an Ethernet connection (for
example, a hub or a switch). The LAN ports are configured as MDIX, for
connection to a computer with a straight through RJ-45 cable.

18 CHAPTER 1: INTRODUCING THE GATEWAY

HARDWARE INSTALLATION

2

Introduction This chapter will guide you through a basic installation of the Gateway,

including:

■ Connecting the Gateway to the Internet.

■ Connecting the Gateway to your network.

■ Setting up your computers for networking with the Gateway.

Safety Information

Positioning the Gateway

WARNING: Please read the “
before you start.

VORSICHT: Bitte lesen Sie den Abschnitt “
sorgfältig durch, bevor Sie das Gerät einschalten.

AVERTISSEMENT: Veuillez lire attentivement la section “

importantes de sécurité” avant de mettre en route.

You should place the Gateway in a location that:

■ is conveniently located for connection to the cable or DSL modem that

will be used to connect to the Internet.

■ allows convenient connection to the computers that will be connected

to the four LAN ports on the rear panel, if desired.

■ allows easy viewing of the front panel LED indicator lights, and access

to the rear panel connectors, if necessary.

■ (Wireless Cable/DSL Gateway only) is centrally located to the wireless

computers that will connect to the Gateway. A suitable location might
be on top of a high shelf or similar furniture to optimise wireless

Safety Information” section in Appendix D

Wichtige Sicherheitshinweise”

Consignes

20 CHAPTER 2: HARDWARE INSTALLATION

connections to computers in both horizontal and vertical directions,

allowing wider coverage.

When positioning your Gateway, ensure:

■ It is out of direct sunlight and away from sources of heat.

■ Cabling is away from power lines, fluorescent lighting fixtures, and

sources of electrical noise such as radios, transmitters and broadband

amplifiers.

■ Water or moisture cannot enter the case of the unit.

■ Air flow around the unit and through the vents in the side of the case

is not restricted. 3Com recommends you provide a minimum of

25 mm (1 in.) clearance.

Using the Rubber

Feet

Use the four self-adhesive rubber feet to prevent your Gateway from
moving around on your desk or when stacking with other flat top
OfficeConnect units. Only stick the feet to the marked areas at each
corner of the underside of your Gateway.

Wall Mounting There are two slots on the underside of the Gateway that can be used for

wall mounting.

When wall mounting the unit, ensure that it is within reach of the power
outlet.

You will need two suitable screws to wall mount the unit. To do this:

1 Ensure that the wall you use is smooth, flat, dry and sturdy and make two

screw holes which are 150 mm (5.9 in.) apart.

2 Fix the screws into the wall, leaving their heads 3 mm (0.12 in.) clear of

the wall surface.

3 Remove any connections to the unit and locate it over the screw heads.

When in line, gently push the unit on to the wall and move it downwards
to secure.

When making connections, be careful not to push the unit up and off the
wall.

Before you Install your Gateway 21

CAUTION: Only wall mount single units, do not wall mount stacked
units.

Before you Install your Gateway

Before you install and configure your Gateway, you need the following
additional information. If you do not have this information, contact your
Internet Service Provider (ISP). Space is provided below for you to record
this information.

If you have a DSL connection and your ISP allocates IP information
dynamically over PPPoE, you need a User Name and Password:

PPPoE User Name : ______________________

PPPoE Password : ______________________

PPPoE Service Name : ______________________

If you have a DSL connection and your ISP allocates IP information
dynamically over PPTP, you need a User Name and Password:

PPTP User Name : ______________________

PPTP Password : ______________________

PPTP Server Address : ____.____.____.____

You only need a PPPoE Service Name or a PPTP Server Address if your ISP
requires one. Do not enter anything if your ISP does not require this
information.

If your ISP allocates fixed or static IP information, you need the following
information:

IP Address : ____.____.____.____

Subnet Mask : ____.____.____.____

Default Gateway address : ____.____.____.____

DNS address : ____.____.____.____

22 CHAPTER 2: HARDWARE INSTALLATION

If your ISP allocates IP information dynamically over a protocol other than
PPPoE, you do not need any further information. This configuration is
typical of cable connections.

Powering Up the Gateway

Connecting the Gateway

To power up the Gateway:

1 Plug the power adapter into the power adapter socket located on the

back panel of the Gateway.

2 Plug the power adapter into a standard electrical wall socket.

The first step for installing your Gateway is to physically connect it to a
cable or DSL modem and then connect it to a computer in order to be
able to access the Internet. See Figure 5

Figure 5 Connecting the Gateway

:

For example purposes only, this graphic shows a Wireless Cable/DSL
Gateway.

To use your Gateway to connect to the Internet through an external cable
or DSL modem:

1 Insert one end of the supplied Ethernet (RJ-45 Category 5) cable into the

Cable/DSL port on the rear panel of the Gateway.

2 Insert the other end of the cable into the RJ-45 port on your cable or DSL

modem. Check that the Cable/DSL status LED lights on the Gateway.

Connecting the Gateway 23

3 Connect the cable or DSL modem to the Internet.
4 Connect your computer to one of the four LAN ports on the Gateway

using a twisted pair cable. Check that the corresponding LAN status LED
on the Gateway lights.

You have now completed the hardware installation of your Gateway.
Next you need to set up your computers so that they can make use of the
Gateway to communicate with the Internet.

3Com recommends that you perform the initial Gateway configuration
from a computer that is directly connected to one of the LAN ports.

Wireless Only If you configure the Gateway from a wireless computer, note that you

may lose contact with the Gateway if you change the wireless
configuration.

To communicate with the Wireless Cable/DSL Gateway, your wireless NIC
should be set as follows:

■ WEP encryption - none

■ Service Area Name/SSID - 3Com

■ Channel - 11

24 CHAPTER 2: HARDWARE INSTALLATION

3

Obtaining an IP Address Automatically

SETTING UP YOUR COMPUTERS

The Gateway has the ability to dynamically allocate network addresses to
the computers on your network, using DHCP. However, your computers
need to be configured correctly for this to take place. To change the
configuration of your computers to allow this, follow the instructions in
this chapter. If your computers are configured with fixed or static
addresses and you do not wish to change this, then you should use the
Discovery program on the Gateway CD-ROM to detect and configure
your Gateway. Refer to Appendix A
Discovery program.

for information on using the

Windows 2000 If you are using a Windows 2000-based computer, use the following

procedure to change your TCP/IP settings:

1 From the Windows Start Menu, select Settings > Control Panel.
2 Double click on Network and Dial-Up Connections.
3 Double click on Local Area Connection.
4 Click on Properties.
5 A screen similar to Figure 6

TCP/IP and click on Properties.

should be displayed. Select Internet Protocol

26 CHAPTER 3: SETTING UP YOUR COMPUTERS

Figure 6 Local Area Properties Screen

6 Ensure that the options Obtain an IP Address automatically, and Obtain

DNS server address automatically are both selected as shown in Figure 7
Click OK.

.

Figure 7 Internet Protocol (TCP/IP) Properties Screen

7 Restart your computer.

Windows XP

Windows 95/98/ME

Obtaining an IP Address Automatically 27

1 From the Windows Start menu, select Control Panel.
2 Click on Network and Internet Connections.
3 Click on the Network Connections icon.
4 Double click on LAN or High Speed Connection icon. A screen titled Local

Area Connection Status will appear.

5 Select Internet Protocol TCP/IP and click on Properties.
6 Ensure that the options Obtain an IP Address automatically, and Obtain

DNS servers automatically are both selected. Click OK.

7 Restart your computer.

1 From the Windows Start Menu, select Settings > Control Panel.
2 Double click on Network. Select the TCP/IP item for your network card

and click on Properties.

3 In the TCP/IP dialog, select the IP Address tab, and ensure that Obtain IP

address automatically is selected. Click OK.

Macintosh If you are using a Macintosh computer, use the following procedure to

change your TCP/IP settings:

1 From the desktop, select Apple Menu, Control Panels, and TCP/IP.
2 In the TCP/IP control panel, set Connect Via: to “Ethernet”.
3 In the TCP/IP control panel, set Configure: to “Using DHCP Server.”
4 Close the TCP/IP dialog box, and save your changes.
5 Restart your computer.

28 CHAPTER 3: SETTING UP YOUR COMPUTERS

Disabling PPPoE and PPTP Client Software

If you have PPPoE or PPTP client software installed on your computer, you
will need to disable it. To do this:

1 From the Windows Start menu, select Settings > Control Panel.
2 Double click on Internet Options.
3 Select the Connections Tab. A screen similar to Figure 8

displayed.

4 Select the Never Dial a Connection option.

Figure 8 Internet Properties Screen

should be

Disabling Web Proxy

You may wish to remove the PPPoE client software from your computer
to free resources, as it is not required for use with the Gateway.

Ensure that you do not have a web proxy enabled on your computer.

Go to the Control Panel and click on Internet Options. Select the
Connections tab and click LAN Settings at the bottom. Make sure that
the Use Proxy Server option is unchecked.

4

RUNNING THE SETUP WIZARD

Accessing the Wizard

The Gateway setup program is Web-based, which means that it is
accessed through your Web browser (Netscape Navigator or Internet
Explorer).

To use the Setup Wizard:

1 Ensure that you have at least one computer connected to the Gateway.

Refer to Chapter 2

2 Launch your Web browser on the computer.
3 Enter the following URL in the location or address field of your browser:

http://192.168.1.1 (Figure 9

Figure 9 Web Browser Location Field (Factory Default)

4 To log in as an administrator, enter the password (the default setting is

admin) in the System Password field and click Log in (Figure 10

Be sure to bookmark this screen for easy reference if you should want to
change the Gateway settings.

for details on how to do this.

). The Login screen displays.

).

30 CHAPTER 4: RUNNING THE SETUP WIZARD

Figure 10 Gateway Login Screen

5 If the password is correct, the Country Selection screen will appear (on

the Wireless Cable/DSL Gateway only). Select the country you wish to
configure the gateway for, then click Apply. (Figure 11

)

Figure 11 Country Selection Screen

6 When you have logged in (Cable/DSL Gateway) or selected a country

(Wireless Cable/DSL Gateway) either:

■ The Welcome screen will appear (Figure 12). Select the Wizard tab

and click Wizard.

Accessing the Wizard 31

or

■ If your Gateway has not been configured before, the Wizard will

launch automatically (refer to Figure 13

).

7 Click Next.
8 You will be guided step by step through a basic setup procedure.

Figure 12 Welcome Screen

Figure 13 Wizard Screen

32 CHAPTER 4: RUNNING THE SETUP WIZARD

Password Figure 14 Change Administration Password Screen

When the Change Administration Password screen (Figure 14) appears,
type the Old Password, then a new password in both the New Password
and Confirm Password boxes.

3Com recommends entering a new password when setting up the
Gateway for the first time. The Gateway is shipped from the factory with
a default password, admin.

Time Zone

1. Password is case sensitive.

2. Write the new password down and keep it in a safe place, so that you

can change your settings in the future.

Click Next to display the Time Zone setup screen (Figure 15

Figure 15 Time Zone Screen

).

Select your time zone from the pull-down menu, check the daylight
savings option if required, and then click Next.

Accessing the Wizard 33

The Daylight Savings option advances the system clock by one hour. It
does not cause the system clock to be updated for daylight savings time
automatically.

WAN Settings

Figure 16 Internet Settings Screen

This Internet Addressing Mode window allows you to set up the Gateway
for the type of Internet connection you have. Before setting up your
Internet connection mode, have the modem setting information from
your ISP ready.

Select an Internet Addressing mode from the following:

■ PPPoE is required (typically DSL users only) see page 34

■ ISP provides configuration dynamically (via DHCP) see page 35

■ ISP has provided a static IP address see page 36

■ PPTP is required (some DSL users in Europe) see page 37

and click Next.

For further information on selecting a mode see “

page 55

.

Internet Settings” on

34 CHAPTER 4: RUNNING THE SETUP WIZARD

PPPoE Mode

Figure 17 PPPoE Screen

To setup the gateway for use with a PPP over Ethernet (PPPoE)
connection, use the following procedure:

1 Enter your PPP over Ethernet user name in the PPPoE User Name text box.
2 Enter your PPP over Ethernet password in the PPPoE Password text box.
3 Enter your PPP over Ethernet service name in the PPPoE Service Name text

box.
This is optional. Not all ISPs require a PPPoE service name.

Do not enter anything in this box if your ISP does not require a service
name.

4 Check all of your settings, and then click Next. Refer to “

on page 38

for more information.

LAN Settings”

Accessing the Wizard 35

Dynamic IP Address Mode

To setup the Gateway for use with a dynamic IP address connection:

1 Select the ISP provides configuration dynamically (via DHCP) and then

click Next. See Figure 16

Figure 18 Hostname Screen

.

2 Some ISPs require a host name. If your ISP has this requirement, enter the

host name in the Host Name text box (Figure 18

) and click Next. The

Clone MAC Address screen displays.

Figure 19 Clone MAC Address Screen

3 If your ISP requires an assigned MAC address, select Yes, I would like to

enter a MAC address manually and enter the values for a MAC address if
required (Figure 19

). If the computer you are now using is the one that

was previously connected directly to the cable modem, choose Yes,
please clone the MAC address from the PC I’m currently using.

36 CHAPTER 4: RUNNING THE SETUP WIZARD

Static IP Mode

To setup the Gateway for use with a static IP address connection, use the
following procedure:

1 Select ISP has provided a static IP address, (see Figure 16

Next. Figure 20

Figure 20 Static IP Mode Screen

displays.

) and then click

2 Enter your IP Address in the IP Address text box.
3 Enter your subnet mask in the Subnet Mask text box.
4 Enter your ISP gateway address in the Internet (ISP) Gateway Address text

box.

5 Enter your primary DNS address in the Primary DNS Address text box.
6 Enter your secondary DNS address in the Secondary DNS Address text

box.
This step is optional. Not all ISPs require a secondary DNS address.

7 Check all of your settings, and then click Next.

Accessing the Wizard 37

PPTP Mode

Figure 21 PPTP Mode Screen

To setup the gateway for use with a PPTP connection, use the following
procedure:

1 Enter your PPTP server address in the PPTP Server Address text box.
2 Enter your PPTP user name in the PPTP User Name text box.
3 Enter your PPTP password in the PPTP Password text box.
4 Enter your Primary DNS Address and Secondary DNS address.

Your ISP may provide you with primary and secondary DNS addresses. If
they have been provided, enter the addresses in the appropriate text
boxes. If not, leave 0.0.0.0 in the boxes.

5 Check all of your settings, and then click Next. Figure 22

Figure 22 PPTP IP Settings

displays.

38 CHAPTER 4: RUNNING THE SETUP WIZARD

6 IP settings must be used when establishing a PPTP connection. Fill in the

Initial IP Address and the Initial Subnet Mask fields if your ISP has
provided you with these settings. Alternatively, if the PPTP server is
located in your DSL modem, click Suggest to select an IP address on the
same subnet as the PPTP server.

LAN Settings

DHCP The Gateway contains a Dynamic Host Configuration (DHCP) server that

Figure 23 LAN IP Address Screen

This screen displays a suggested LAN IP address and subnet mask of the
Gateway. It also allows you to change the IP address and subnet mask.

can automatically configure the TCP/IP settings of every computer on
your network.

Figure 24 DHCP Server Setup Screen

To activate the DHCP Server option, select Enable the DHCP server with
the following settings: and specify the IP pool range. The largest available
continuous IP pool will be automatically entered; if this is not appropriate,

Accessing the Wizard 39

make your required changes. To disable DHCP, select Do not enable the
DHCP server. Click Next when you have finished.

If you have a Cable/DSL Gateway, your Gateway is now configured and
ready for use. See Chapter 5

for a detailed description of the Gateway

configuration screens. If you have a Wireless Cable/DSL Gateway refer to

Wireless Settings” below.

“

Wireless Settings The following section applies to the Wireless Cable/DSL Gateway only.

Figure 25 Wireless Configuration Screen

This screen displays a suggested Channel and Service Area Name. It also
allows you to change these settings. There are a maximum of 13
channels, the number available to you is dependent on the country you
reside in. The Service Area Name default for 3Com products is "3Com".
Up to 32 (case sensitive) characters can be entered for the Service Area
Name.

3Com strongly recommends that you change the SSID to something
other than the default.

For information on improving your Wireless network security see

Wireless Settings” on page 46.

“

If you are configuring the Gateway from a wireless computer any
changes you make to the wireless configuration will result in
communication between the Gateway and your computer being lost. This
is why 3Com strongly recommends that you configure the Gateway from
a wired computer.

40 CHAPTER 4: RUNNING THE SETUP WIZARD

It is very important that you set up your wireless clients to use the same
Service Area Name or SSID as the one you use on this screen. If your
clients use a different Service Area Name then they will not be able to
communicate with the Gateway.

The choice of channel is less important as Clients will generally search all
of the available channels. You should however make a note of the
channel you select as this may be useful if you experience problems with
your clients.

Summary

Figure 26 Configuration Summary Screen

When you complete the Setup Wizard, a configuration summary will
display. Verify the configuration information of the Gateway and then
click Finish to save your settings. 3Com recommends that you print this
page for your records.

If you have made changes to the LAN Settings or wireless configuration
options, you may need to reconfigure the computer you are using in
order to make contact with the Gateway again.

Your Gateway is now configured and ready for use.

See Chapter 5

for a detailed description of the Gateway configuration

screens.

5

GATEWAY CONFIGURATION

Navigating Through the Gateway Configuration Pages

Main Menu At the left side of all screens is a main menu, as shown in Figure 27

This chapter describes all the screens available through the Gateway
configuration pages, and is provided as a reference. To get to the
configuration pages, browse to the Gateway by entering the URL in the
location bar of your browser. The default URL is http://192.168.1.1
but if you changed the Gateway LAN IP address during initial
configuration, use the new IP address instead. When you have browsed
to the Gateway, log in using your system password (default admin).

on

page 42

appear in the main part of the screen.

■ Welcome - displays the firmware version of the Gateway, allows you

■ LAN Settings - allows you to configure IP address and subnet mask

■ Wireless Settings (Wireless Cable/DSL Gateway only) - enables

■ Internet Settings - sets up Internet addressing modes such as PPPoE

. When you click on a topic from the main menu, that page will

to change your password, and launch the Wizard

information, setup DHCP server parameters, and display the DHCP
client list.

/disables access from wireless computers, and provides facilities for
improving the security of the wireless network.

and PPTP connections, dynamic IP address allocation and static IP
address settings

■ Firewall - allows configuration of the Gateway’s firewall features:

Virtual Servers, Special Applications, PCs Privileges and security
options

■ System Tools - allows the administrator to perform maintenance

activities on the Gateway.

42 CHAPTER 5: GATEWAY CONFIGURATION

■ Status and Logs - displays the current status and activity logs of the

Gateway.

■ Support - contains a comprehensive online help system

Option Tabs Each corresponding menu page may also provide sub-sections which are

accessed through the use of tabs (see Figure 27
sub-section, simply click on the required tab.

Getting Help

On every screen, a Help button is available which provides access to the
context-sensitive online help system. Click Help for further assistance and
guidance relating to the current screen.

Welcome Screen Figure 27 Gateway Welcome Screen

for example). To access a

The Welcome section allows you to view the Notice board and to change
your Password. You can also gain access to the Configuration Wizard.

Accessing the Wizard” on page 29 for details).

(See “

Notice Board Figure 28 Notice Board Screen

The Notice Board is used to display configuration warning messages. For
example, you would be warned if you had disabled the Firewall.

Welcome Screen 43

Password

Figure 29 Password Screen

Changing the Administration Password

You can change the password to prevent unauthorized access to the
Administration System. To do this:

1 Enter the current password in the Old Password field
2 Enter the new password in the New Password field
3 Enter the new password again in the Confirm Password field
4 Click Apply to save the new password

The password is case sensitive.

44 CHAPTER 5: GATEWAY CONFIGURATION

If you have forgotten your password you need to reset the Gateway. See

Forgotten Password and Reset to Factory Defaults” on page 76

“

Wizard Figure 30 Wizard Screen

Click WIZARD... to launch the configuration wizard. Refer to Chapter 4
for information on how to run the wizard.

LAN Settings The LAN Settings menu provides the following options:

Unit Configuration

Figure 31 Unit Configuration Screen

LAN Settings 45

The LAN Settings screen is used to specify the LAN IP address of your
Gateway, and to configure the DHCP server.

1 Select Unit Configuration and then specify the Gateway IP Address and

Subnet Mask in the LAN Settings field. The default IP address of the

Gateway is 192.168.1.1.

2 If you want to use the Gateway as a DHCP Server, click in the Enable

check box.

3 Clicking Auto Range will automatically choose the largest available range

of addresses for your network.

4 Check all of your settings, and then click Apply.

The DHCP server will give out addresses to both wired and wireless
clients.

DHCP Clients List

Figure 32 DHCP Clients List Screen

The DHCP Clients List provides details on the devices that are connected
to the LAN. The list is only created when the Gateway is set up as a DHCP
server. For each device that is connected to the LAN, the IP address, Host
Name, MAC address and Client Type of that device is displayed. As you
connect more devices to the LAN, the client list will grow to a maximum
number of clients, which is determined by the IP address range.

The Release button allows the lease time for the IP address that has been
issued to a device to be cleared. The lease time is set at 12 hours. If a PC
has been switched off, using the Release button would allow the 12 hour
lease time to be cleared. The IP address would then be available for
another device if there were no other IP addresses available.

46 CHAPTER 5: GATEWAY CONFIGURATION

As the IP address is fixed to a MAC address, then each particular
computer will normally be issued with the same IP address. The only time
that a PC will get a different IP address is if the unit is reset to factory
defaults or the DHCP server has run out of IP addresses.

Wireless Settings The following section applies to the Wireless Cable/DSL Gateway only.

To improve the security of your wireless network, 3Com recommends
that you:

1. Change the SSID from its default value - see page 47

2. Enable Encryption - see page 48

3. Enable Connection Control - see page 50

Configuration Figure 33 Configuration Screen

Enable Wireless Networking

Allows you to enable/disable the wireless section of your LAN. When
disabled, no wireless PCs can gain access to either the Internet or other
PCs on your Wired or Wireless LAN.

Channel Selection

The Channel Selector allows you to specify which Channel the Gateway
will transmit and receive on. If someone else nearby is using the same
Channel as you, there will be a reduction in the performance of your
network. If this seems to be the case, you should select a different

Wireless Settings 47

channel number. Usually the Wireless computers will scan to find the
correct channel, but if they don't you must configure them to use the
same Channel number as the Gateway.

Valid channels are country dependent. See “

Channels” on page 115 for a

list of channels approved by each country.

Service Area Name/SSID

This allows you to name your Wireless network. The field will accept any
alphanumeric string and has a maximum length of 32 characters. Your
Wireless computers must be configured with exactly the same name or
you will not establish a connection. The Service Area Name may also be
referred to as "ESSID" depending on your networking vendor. By default
the Gateway uses the name "3Com". 3Com recommends that you
change the default name.

In order that your wireless computers can connect to the Gateway, you
must:

■ Use Infrastructure Mode not Adhoc Mode.

■ Have the same Service Area Name as the Gateway.

■ Have the same Channel number as the Gateway.

■ Use the same encryption type and keys as the Gateway.

■ Ensure that the PC is included in the authorised Wireless PCs list if

Connection Control is enabled. See page 50

.

Disable Broadcast SSID

This feature can be used to improve the security of your wireless network.
When the tickbox is checked, the Gateway will not broadcast the Service
Area Name/SSID of your wireless network. This will prevent unauthorised
clients from detecting your SSID and attempting to connect to your
network.

If you have a wireless client that can detect all the available SSIDs in your
area, your client will not list the Gateway SSID when this feature is
enabled.

3Com recommends that you install your wireless network with this
feature disabled and then enable it once you have set up the Gateway
and wireless clients.

48 CHAPTER 5: GATEWAY CONFIGURATION

Encryption Figure 34 Encryption Screen

Wired Equivalent Privacy or WEP allows you to encrypt the traffic
between your Wireless PC and the Gateway. It is important to remember
that with WEP disabled anyone with a Wireless PC can eavesdrop on your
network. 3Com recommends that you get the network working with
WEP disabled first and then enable it as the last step. This will simplify
setting up your network.

If you enable WEP on the Gateway, you must reconfigure your wireless
PCs to use exactly the same Encryption Type and Keys otherwise the
devices will not understand each other.

WEP is for securing data transmitted through wireless communications
between the Gateway and it's wireless clients. Enabling WEP has no
security effect on data transmitted through wired (Ethernet) connections
or through your connections to the Internet.

Wireless Encryption Type

There are two levels of encryption available, 64 bit (sometimes referred to
as 40 bit) and 128 bit. 128 bit will result in a higher level of security, but
may cause a slight decrease in performance. Use the Wireless Encryption

Typ e box to select the desired level.

Wireless Settings 49

Encryption Keys

Figure 35 Encryption Keys Screen

A Key is a hexadecimal (0-9, A-F) number used to encrypt and decrypt the
data. There can be up to 4 keys and each key can be as long as 26 digits.
The Gateway also offers a number of methods for converting plain text
into hex keys. The text is much easier to remember than hex keys but it
relies on your wireless adapters also supporting this feature. Different
manufacturers have developed different ways of converting plain text and
so interoperability is not guaranteed. If you are experiencing difficulty, the
Manual Hex Key method is supported by most vendors.

There are four methods available to generate the encryption keys:

■ Manual Key Entry - This method allows you to manually enter hex

keys. Virtually all manufacturers support this scheme. Enter a two digit
hexadecimal number in every box. Hexadecimal numbers are formed
from 0-9 and A-F.

■ 3Com Encryption String - This method is supported by 3Com Wireless

products. The string can contain any alphanumeric characters and
must be between 6 and 30 characters long. A single string will
automatically generate 4 unique keys for 64 or 128 bit WEP.

■ ASCII - This method is supported by some adapter cards running

under Windows XP. The string must be exactly 5 characters for 64 bit
WEP and 13 characters for 128 bit WEP. You must enter a separate
string for each of the 4 Keys. You can leave a string blank provided
this Key is not selected as the Active Transmit Key.

50 CHAPTER 5: GATEWAY CONFIGURATION

■ Passphrase - This is another common method and similar to the 3Com

Encryption string. In 64 bit WEP, the passphrase will generate 4
different keys. However, in 128 bit WEP, this method only generates 1
key which is replicated for all 4 keys. The passphrase can be up to 31
characters long and may contain any alphanumeric characters.

Select from the drop down list the key generation method you wish to
use. If you have other wireless products choose the scheme that is
compatible with these, then enter the appropriate information.

If you encounter any difficulty when you enable WEP ensure that you
check that each key on your wireless computer is exactly the same as
each key on your Gateway. In other words, Key number 1 on the Wireless
computer must have the same Hex number as Key number 1 on the
Gateway, Key 2 on the Wireless computer must match Key 2 on the
Gateway and so on.

The Active Transmit Key selects which of the 4 Keys the Gateway uses
when it transmits. You can change the selected key periodically to
increase the security of your network.

Connection Control

Some wireless adapters have only one key available on their WEP
configuration page. If this is the case ensure it is the same as Key 1 on the
Gateway and that it is selected as the active transmit key.

Figure 36 Connection Control Screen

A higher level of security can be achieved for your wireless network if you
use both encryption and you specify only certain wireless computers can
connect to the Gateway. By default, any wireless computer that has the

Wireless Settings 51

same Service Area Name/SSID, channel and encryption settings as the
Gateway can connect to it.

Select Only Authorised Wireless PCs can connect to the Gateway to
enable and configure this feature.

If you enable this feature from a Wireless PC, it will automatically be
added to the Authorised Wireless PC list.

Authorised Wireless PCs

Figure 37 Connection Control Detail Screen

To create a list of Wireless computers that can access the Gateway:

1 Press New.
2 Specify the MAC address of the Wireless PC that is to be allowed to

connect.

The drop down list on the Connection Control window will contain the
MAC addresses of all Wireless PCs that are in range, currently operating,
and have the same Service Area Name/SSID, channel and encryption
settings as the Gateway. You will find this screen easier to use if you set
up and make a note of all of your wireless PC's on your network first. You
may also add the entries manually if you know the MAC address.

To add a MAC address that is not in the list, select Add Manually from the
list, and enter the MAC address in the appropriate fields. A MAC address
consists of 12 characters. Valid characters are '0-9', and 'A-F'.

52 CHAPTER 5: GATEWAY CONFIGURATION

3 Press Add.

Click Close to discard all changes.

Modifying a MAC Address
1 Click on the MAC address to be modified in the table (Figure 38
2 Modify the MAC address. The MAC address can be edited manually, or a

different MAC address may be selected from the drop down list of

detected addresses.

3 Press Apply to accept the changes.

Figure 38 MAC Address Table

)

Click Close to discard all changes.

Deleting a MAC Address

The connection rights for a Wireless PC listed in the table can be removed

by pressing Delete for that entry in the table.

Once an entry has been deleted it cannot be undone. Please wait 30

seconds for changes to take effect.

Client List Figure 39 Client List Screen

The Wireless Client List provides details on the devices that are connected
to the Wireless LAN. The list is only created when Wireless Networking is
enabled. For each device that is connected to the Wireless LAN, the MAC
address and Connection Speed of that device is displayed. As you
connect more devices to the Wireless LAN, the client list will grow to a
maximum of 32 (the maximum number of wireless devices that the
Gateway can support).

Wireless Settings 53

Profile

Figure 40 Profile Screen

Some 3Com Wireless Network Adapters allow you to import Wireless
configurations via a ‘profile’. The Gateway can generate a profile so that
you do not need to configure your Wireless PCs manually.

The profile contains three items as follows:

54 CHAPTER 5: GATEWAY CONFIGURATION

■ Service Area Name/SSID of the Gateway

This is configured on the Configuration tab under the Wireless
Settings option.

■ Encryption settings from the Gateway

This is configured on the Encryption tab under the Wireless Settings
option.

■ Profile Name

This is used to identify the profile once it has been imported into the
Wireless Network Adapter configuration software.

To set up a profile (once the Service Area Name/SSID and Encryption

settings have been configured in the Gateway):

1 Enter a Profile Name (up to 25 alphanumeric characters) and then click

Save Profile.
2 Your browser will then prompt you to enter a file name and folder

location in which to save the profile. Once the profile has been saved it

can be copied on to another PC and imported into the 3Com Wireless

Network Adapter.

For instructions on how to import a profile, refer to the User Guide that

accompanies your 3Com Wireless Network Adapter(s).

If, once the profile is imported, the Wireless Network Adapter cannot

connect to the Gateway, check that:

■ the adapter is within range of the Gateway

if Connection Control has been enabled in the Gateway, the MAC

address of the Wireless Network Adapter must be included in the list of

authorised Wireless PCs.

Internet Settings 55

Internet Settings Before you can configure the Gateway, you need to know the IP

information allocation method used by your ISP. There are four different
ways that ISPs can allocate IP information, as described below:

1 Static IP Address (DSL or Cable)

The ISP provides the IP addressing information for you to enter manually.
To configure the Gateway you will need to know the following:

■ IP Address

■ Subnet Mask

■ ISP Gateway

■ DNS address(es)

2 Dynamic IP Address (DSL or Cable)

Dynamic IP addressing (or DHCP) automatically assigns the Gateway IP
information. This method is popular with Cable providers. This method is
also used if your modem has a built in DHCP server.

3 PPPoE (DSL only)

If the installation instructions that accompany your modem ask you to
install a PPPoE client on your PC, then select this option. To configure the
Gateway you will need to know the following:

■ Username

■ Password

■ Service Name (if required by your ISP)

When you install the Gateway, you will not need to use the PPPoE
software on your PC.

4 PPTP (DSL or Cable)

PPTP is only used by some European providers. If the installation
instructions that accompany your modem ask you to setup a dialup
connection using a PPTP VPN tunnel then select this option. To configure
the Gateway you will need to know the following:

■ Username

■ Password

■ VPN Server address (usually your modem)

56 CHAPTER 5: GATEWAY CONFIGURATION

When you install the Gateway, you will not need to use the dialup VPN on

your PC anymore.

Connection to ISP

Figure 41 Connection to ISP Screen

Before beginning this section, ensure you have the required information

from your ISP. (See “

Before you Install your Gateway” on page 21.)

Select Internet Settings from the main menu to display Connection to ISP

(Figure 41

). Choose an IP Allocation Mode from the drop down box.

Select an IP Allocation Mode from the following:

■ Static IP address (to be specified manually) see page 57

■ Dynamic IP address (automatically allocated) see page 58

■ PPPoE (used by DSL providers only) see page 59

■ PPTP (used by some European providers) see page 60

Internet Settings 57

Static IP Address

Figure 42 Connection Parameters Screen - Static IP

To setup the Gateway for use with a Static IP address connection:

1 Select Static IP Address (to be specified manually) in the IP Allocation

Mode field (Figure 42

).

2 Enter your IP Address in the IP Address text box.

This information, along with the rest of the information in this screen,
should be provided to you by your ISP. If the information is already
entered, your ISP has pre-configured your Gateway, and you should go to

.

step 7

3 Enter your subnet mask in the Subnet Mask text box.
4 Enter your ISP Gateway address in the ISP Gateway Address text box.
5 Enter your primary DNS address in the Primary DNS Address text box.
6 Enter your secondary DNS address in the Secondary DNS Address text

box.
This step is optional. Not all ISPs require a secondary DNS address.

7 Check all of your settings, and then click Apply.

58 CHAPTER 5: GATEWAY CONFIGURATION

Dynamic IP Address

Figure 43 Connection Parameters Screen - Dynamic IP

If this mode is selected, your IP Address, Subnet Mask, and DNS Address

will be obtained automatically from your ISP. They are not displayed on

this screen, but may be viewed on the Status screen (click on Status and

Logs on the left hand menu bar).

To setup the Gateway for use with a dynamic IP address connection:

1 Select Dynamic IP Address (automatically allocated) in the IP Allocation

Mode field. (Figure 43

)

2 Enter your Primary DNS Address and Secondary DNS address.

Your ISP may provide you with primary and secondary DNS addresses. If

they have been provided, enter the addresses in the appropriate text

boxes. If not, leave 0.0.0.0 in the boxes.
3 Enter the Host Name (optional).

Some ISPs require a host name. If your ISP has this requirement, enter the

host name in the Host Name text box.
4 If you use ‘Cable’, your ISP may use your MAC address to authenticate

you. If this is the case, you will need to ‘Clone’ your MAC address. There

are three options:

■ Use the Gateway’s original Internet MAC address - This field is

selected by default and is automatically filled in with the MAC address
of the Gateway.

Internet Settings 59

■ Use this PC’s MAC address - This field is automatically filled in with the

MAC address of the PC you are using to configure the Gateway. You
should use this address only if you were previously using this computer
to connect directly to your modem.

■ Enter a new MAC address manually - Use this option if you want to

specify a new MAC address. Enter the new MAC address.

5 Check all settings and click Apply.

PPP over Ethernet

Figure 44 PPPoE Setup Screen

To setup the Gateway for use with a PPP over Ethernet connection, use
the following procedure:

1 Select PPP over Ethernet in the IP Allocation Mode field. (Figure 44

)

2 Enter your Primary DNS Address and Secondary DNS address.

Your ISP may provide you with primary and secondary DNS addresses. If
they have been provided, enter the addresses in the appropriate text
boxes. If not, leave 0.0.0.0 in the boxes.

3 Enter the Host Name (optional).

Some ISPs require a host name. If your ISP has this requirement, enter the
host name in the Host Name text box.

4 Enter your PPP over Ethernet user name in the PPPoE User Name text box.
5 Enter a password in the PPPoE Password text box.

60 CHAPTER 5: GATEWAY CONFIGURATION

6 Enter your PPP over Ethernet service name in the PPPoE Service Name text

box. Not all ISPs require a PPPoE service name. Only enter a service name

if your ISP requires this.
7 Select an idle time from the Maximum Idle Time drop-down list.

This value will correspond to the amount of idle time (no Internet activity)

that will pass before the Gateway automatically ends your PPP over

Ethernet session.

Since the Gateway contains its own PPPoE client, you no longer need to

run PPPoE client software on your computer to access the Internet.

PPTP

Figure 45 PPTP Setup Screen

To setup the Gateway for use with a PPTP connection, use the following

procedure:

1 Select PPTP (used by some European providers) in the IP Allocation Mode

field. (Figure 45

)

2 Enter your PPTP server address in the PPTP Server Address text box (this is

typically the address of your modem).

3 Enter your PPTP user name in the PPTP User Name text box.
4 Enter your password in the PPTP Password text box.
5 Enter your Primary DNS Address and Secondary DNS address.

Your ISP may provide you with primary and secondary DNS addresses. If

they have been provided, enter the addresses in the appropriate text

boxes. If not, leave 0.0.0.0 in the boxes.

Firewall 61

6 Select an idle time from the Maximum Idle Time drop-down list.

This value will correspond to the amount of idle time (no Internet activity)
that will pass before the Gateway automatically ends your PPTP session.

7 IP settings must be used when establishing a PPTP connection. Fill in the

Initial IP Address and the Initial Subnet Mask fields if your ISP has
provided you with these settings. Alternatively, if the PPTP server is
located in your DSL modem, click Suggest to select an IP address on the
same subnet as the PPTP server.

Firewall On the main frame of the Firewall setup screen is a menu with four tabs:

Virtual Servers, Special Applications, PCs Privileges, and Security.

Virtual Servers Selecting the Firewall option on the main menu displays the Virtual

Servers setup screen. (Figure 46

Virtual DMZ

)

Figure 46 Virtual Servers Screen

DMZ (De-Militarized Zone) Host is a computer without the protection of
the firewall. This feature allows a single computer to be exposed to
unrestricted 2-way communication from outside of your network. This
feature should be used only if the Virtual Server or Special Applications
options do not provide the level of access needed for certain applications.

To configure one of your computers as a DMZ host, enter the last digit(s)
of the IP address of the computer in the IP Address of DMZ Host text box,
and then click Apply.

62 CHAPTER 5: GATEWAY CONFIGURATION

Virtual Server

Activating and configuring a virtual server allows one or more of the

computers on your network to function as a public server. For example,

one of your computers could be configured as an FTP server, allowing

others outside of your office network to download files of your choosing.

Or, if you have created a Web site, you can configure one of your

computers as a Web server, so that others can view your Web site.

To configure a virtual server:

1 Click New on the right side of the screen to open the Virtual Server

Settings dialogue box. (Figure 47
2 Enter the last digit(s) of the IP address of the computer in the Server IP

Address text box.

)

3 Select the Service from the pull-down list. (Figure 47

Figure 47 Virtual Servers Settings Screen

)

Or select Custom to specify a suitable name for the service and then enter

the port numbers required for that service. (Figure 48

Figure 48 Custom Setup Screen

)

4 Click Add to save the settings.

Firewall 63

The port numbers are specified using a comma-separated list, with
hyphens to denote port number ranges. So for example, entering 2, 3,
5-7 would cause ports 2, 3, 5, 6, and 7 to be activated.

Special Applications

Figure 49 Special Applications Screen

Select Special Applications tab to display Authorized Application setup
screen. (Figure 49

)

Some software applications require special or multiple connections to the
Internet and these would normally be blocked by the firewall. For
example Internet Telephony or Video conferences require multiple
connections.

So that these special applications can work properly and are not blocked,
the firewall needs to be told about them. In each instance there will be a
trigger port and incoming port(s), where traffic on the trigger port tells
the firewall to open the incoming ports.

Each defined Special Application only supports a single computer user,
and up to 10 Special Applications can be defined. Any incoming ports
opened by a Special Application trigger will be closed after five minutes
of inactivity.

To configure special applications:

1 Click New.
2 Select the applications from the pull-down list. (Figure 50

)

64 CHAPTER 5: GATEWAY CONFIGURATION

Figure 50 Special Application Settings Screen

Or select Other to specify a suitable name for the special application and

then enter a value in the Trigger Port and Incoming Ports text boxes

(Figure 50

issued by the application.

The port numbers are specified using a comma-separated list, with

hyphens to denote port number ranges. So for example, entering 2, 3,

5-7 would cause ports 2, 3, 5, 6, and 7 to be activated.

The Gateway will automatically allow FTP and NetMeeting sessions. You

do not need to configure these as Special Applications.

). These values correspond to the outbound port numbers

Figure 51

Other Applications Setup Screen

3 Click Add to save your settings.

Only one computer on your network can use the special application at

any one time.

PC Privileges Figure 52 PC Privileges Screen

Select PC Privileges to display the PC Privilege setup screen (Figure 52).

Access from the local network to the Internet can be controlled on a
computer-by-computer basis. In the default configuration the Gateway
will allow all connected computers unlimited access to the Internet.

PC Privileges allows you to assign different access rights for different computers on your network.

Firewall 65

To use access control for all computers:

1 Click PCs access authorized services only.
2 Select All PCs to setup the access rights for all computers connected to

the Gateway.

3 Select authorized services by clicking in the appropriate check box(es)

(Figure 53

Figure 53 All PCs Setup Screen

).

66 CHAPTER 5: GATEWAY CONFIGURATION

In addition to the four authorised services listed, you can choose to allow

or block access to other services. You can either:

■ Allow all other services with exceptions, or

■ Block all other services with exceptions

4 To do this, select Allow or Block from the drop down menu and enter the

exceptions into the text box.

The port numbers are specified using a comma-separated list, with

hyphens to denote port number ranges. So for example, entering 2, 3,

5-7 would cause ports 2, 3, 5, 6, and 7 to be activated.

For example, to block access to all services except Web (80) and a service

that uses ports 2,3,5,6 and 7:

1. Tick the Web(80) check box.

2. Select ‘Block’ all other services.

3. Enter ‘2, 3, 5-7’ in the ‘except (specify ports) box. See Figure 54

Figure 54 PC Privileges Setup Screen Example

.

5 Click Modify to save the settings or Close to discard them.

To assign different access rights for different computers:

1 If not already selected, click PCs access authorized services only.
2 Click New to display the PC Privileges setting screen.
3 Enter the last digit(s) of the IP address of the computer in the PC’s IP

Address text box.

Firewall 67

4 Select authorized services by clicking in the appropriate check box(es).

In addition to the four authorised services listed, you can choose to allow
or block access to other services. You can either:

■ Allow all other services with exceptions, or

■ Block all other services with exceptions

See step 4

of the previous section for more details.

5 Click Add to save the settings.

Security Select Security to display the Advanced Settings screen (Figure 55

Figure 55 Security Screen

The Internet connects millions of computer users throughout the world.
The vast majority of the computer users on the Internet are friendly and
have no intention of breaking into, stealing from, or damaging your
network. However, there are hackers who may try to break into your
network.

).

Allow PING from the Internet PING is a utility, which is used to
determine whether a device is active at the specified IP address. PING is
normally used to test the physical connection between two devices, to
ensure that everything is working correctly.

By default the Gateway has PING disabled in order to make the device
more difficult to find on the Internet and less prone to attack.

68 CHAPTER 5: GATEWAY CONFIGURATION

This feature is enabled by clicking on the check box so that a tick can be

seen and then select Apply.

3Com recommends that you leave this disabled.

Disable Firewall The Gateway contains a firewall that detects attack

patterns used by hackers on the Internet and once detected will block

their access to your network. When an attack is detected a log entry will

be generated and the Alert LED will be lit for 2 seconds. The firewall will

block Internet access to all unused TCP and UDP ports.

The Firewall is disabled by clicking on the check box so that a tick can be

seen and then select Apply.

3Com recommends that you leave the firewall enabled.

Enabling Remote Administration

It is possible to administer the Gateway from four options:

1 Disable Remote Administration - This option is set as default.
2 Enable administration from a single Internet Host - Only the specified IP

address can manage the Gateway. Any other users will be rejected.
3 Enable administration from a whole subnet - This option allows a

number of users within a subnet to administer the Gateway.
4 Enable administration from any Internet Host - This options allows any

host to access the administration pages.

To remotely administer your Gateway, enter

http://xxx.xxx.xxx.xxx:8000 in the location bar of the browser

running on the remote computer, where xxx.xxx.xxx.xxx is the Internet IP

address of the Gateway. You may then login using the administration

password.

Your Internet IP address can be found at the bottom of the screen. See

Figure 55

.

System Tools 69

System Tools The main frame of the System Tools screen includes four administration

items: Restart, Time Zone, Configuration, and Upgrade (Figure 56

).

Restart

Figure 56 Restart Screen

If your Gateway is not operating correctly, you can choose to restart the
Gateway by selecting Restart the Gateway, simulating the effect of power
cycling the unit. No configuration information will be lost but the log files
will be erased. This function may be of use if you are experiencing
problems and you wish to re-establish your Internet connection. Any
network users who are currently accessing the Internet will have their
access interrupted whilst the restart takes place, and they may need to
reboot their computers when the restart has completed and the Gateway
is operational again.

Time Zone

Figure 57 Time Zone Screen

70 CHAPTER 5: GATEWAY CONFIGURATION

Choose the time zone that is closest to your actual location. The time

zone setting is used by the system clock when displaying the correct time

in the log files.

If you use Daylight saving tick the Enable Daylight savings box, and then

click Apply (Figure 57

The Gateway reads the correct time from NTP servers on the Internet and

sets its system clock accordingly. The Daylight Savings option merely

advances the system clock by one hour. It does not cause the system

clock to be updated for daylight savings time automatically.

).

Configuration

Figure 58 Configuration Screen

Select the Configuration tab to display the Configuration screen

(Figure 58

).

Backup Configuration

Click BACKUP to save the current Gateway configuration. You will be

prompted to download and save a file to disk.

Restore Configuration Data

If you want to reinstate the configuration settings previously saved to a

file, press Browse to locate the backup file on your computer, and then

click RESTORE to copy the data into the Gateway's memory.

The password will remain unchanged.

System Tools 71

Reset to Factory Default

If you want to reset the settings on your Gateway to those that were
loaded at the factory, click RESET. You will lose all your configuration
changes. The Gateway LAN IP address will revert to 192.168.1.1, and the
DHCP server on the LAN will be enabled. You may need to reconfigure
and restart your computer to re-establish communication with the
Gateway.

Upgrade

Figure 59 Upgrade Screen

The Upgrade facility allows you to install on the Gateway any new
releases of system software that 3Com may make available. To install new
software, you first need to download the software from the 3Com
support web site to a folder on your computer. Once you have done this,
select Browse to tell your web browser where this file is on your
computer, and then click Apply. The file will be copied to the Gateway,
and once this has completed, the Gateway will restart. Although the
upgrade process has been designed to preserve your configuration
settings, it is recommended that you make a backup of the configuration
beforehand, in case the upgrade process fails for any reason (for example,
the connection between the computer and the Gateway is lost while the
new software is being copied to the Gateway).

The upgrade procedure can take up to two minutes, and is complete
when the Alert LED has stopped flashing and is permanently off. Make
sure that you do not interrupt power to the Gateway during the upgrade
procedure; if you do, the software may be corrupted and the Gateway
may not start up properly afterwards. If the Alert LED comes on
continuously after a failed upgrade, refer to Chapter 6

Troubleshooting”.

“

,

72 CHAPTER 5: GATEWAY CONFIGURATION

Status and Logs Figure 60 Status and Logs Screen

Selecting Status and Logs from the main menu displays the Status and

Logs screens (Figure 60

) in your Web browser window. The Status screen

displays a tabular representation of your network and Internet

connection.

Status and Logs 73

Status Status will display the current unit status, including a summary of the

configuration

Logs Logs will allow you to view both the normal events, and security threats

logged by the Gateway

You may be asked to refer to the information on the Status and Logs
screens if you contact your supplier for technical support.

Support

Figure 61 Support Screen

Selecting the Support option on the main menu displays the support links
screen, which contains a list of Internet links that provide information and
support concerning the Gateway (Figure 61

).

74 CHAPTER 5: GATEWAY CONFIGURATION

6

TROUBLESHOOTING

Basic Connection Checks

Browsing to the Gateway Configuration Screens

■ Check that the Gateway is connected to your computers and to the

cable/DSL modem, and that all the equipment is powered on. Check
that the LAN and WAN port link status LEDs on the Gateway are
illuminated, and that any corresponding LEDs on the cable/DSL
modem and the NIC (Wireless Gateway only) are also illuminated.

■ Ensure that the computers have completed their start-up procedure

and are ready for use. Some network interfaces may not be correctly
initialised until the start-up procedure has completed.

■ If the link status LED does not illuminate for a port that is connected,

check that you do not have a faulty cable. Try a different cable.

If you have connected your Gateway and computers together but cannot
browse to the Gateway configuration screens, check the following:

■ Confirm that the physical connection between your computer and the

Gateway is OK, and that the link status LEDs on the Gateway and NIC
are illuminated and indicating the same speed (10Mbps or 100Mbps).
Some NICs do not have status LEDs, in which case a diagnostic
program may be available that can give you this information.

■ Ensure that you have configured your computer as described in

Chapter 3

is connected to the Gateway to ensure that your computer receives an
IP address.

, Setting Up Your Computers. Restart your computer while it

■ When entering the address of the Gateway into your web browser,

ensure that you use the full URL including the http:// prefix (e.g.
http://192.168.1.1).

■ If you cannot browse to the Gateway, use the winipcfg utility in

Windows 95/98/ME to verify that your computer has received the
correct address information from the Gateway. From the Start menu,

76 CHAPTER 6: TROUBLESHOOTING

■ If you still cannot browse to the Gateway, then use the Discovery

choose Run and then enter winipcfg. Check that the computer has
an IP address of the form 192.168.1.xxx (where xxx is in the range
2-254), the subnet mask is 255.255.255.0, and the default Gateway is

192.168.1.1 (the address of the Gateway). If these are not correct, use
the Release and Renew functions to obtain a new IP address from the
Gateway. Under Windows 2000, use the ipconfig command-line utility
to perform the same functions.

program on the accompanying CD-ROM as described in Appendix A

.

Connecting to the Internet

If you can browse to the Gateway configuration screens but cannot

access sites on the Internet, check the following:

■ Confirm that the physical connection between the Gateway and the

cable/DSL modem is OK, and that the link status LEDs on both
Gateway and modem are illuminated.

■ Confirm that the connection between the modem and the cable/DSL

interface is OK.

■ Ensure that you have entered the correct information into the

Gateway configuration screens as required by your Internet Service
Provider. Use the “Internet Settings” screen to verify this.

■ For DSL users, check that the PPPoE or PPTP user name, password and

service name are correct, if these are required. Only enter a PPPoE
service name if your ISP requires one.

■ For cable users, check whether your ISP required a fixed MAC

(Ethernet) address. If so, use the Clone MAC Address feature in the
Gateway to ensure that the correct MAC address is presented, as
described on page 58

■ Ensure that your computers are not configured to use a Web proxy.

.

On Windows computers, this can be found under Control Panel >
Internet Options > Connections.

Forgotten Password and Reset to Factory Defaults

If you can browse to the Gateway configuration screen but cannot log on

because you do not know or have forgotten the password, follow the

steps below to reset the Gateway to it’s factory default configuration.

CAUTION: All your configuration changes will be lost, and you will need

to run the configuration wizard again before you can re-establish your

Wireless Networking 77

Gateway connection to the Internet. Also, other computer users will lose
their network connections whilst this process is taking place, so choose a
time when this would be convenient.

1 Remove power from the Gateway.
2 Disconnect all your computers and the cable/DSL modem from the

Gateway.

3 Using a straight through Ethernet cable, connect the Ethernet Cable/DSL

port on the rear of the Gateway to any one of the LAN ports.

4 Re-apply power to the Gateway. The Alert LED will flash as the Gateway

starts up, and after approximately 30 seconds will start to flash more
slowly (typically 2 seconds on, 2 seconds off). Once the Alert LED has
started to flash slowly, remove power from the Gateway.

5 Remove the cable connecting the Cable/DSL port to the LAN port, and

reconnect one of your computers to one of the Gateway LAN ports.

6 Re-apply power to the Gateway, and when the start-up sequence has

completed, browse to:

http://192.168.1.1

Wireless Networking

and run the configuration wizard. You may need to restart your computer
before you attempt this.

7 When the configuration wizard has completed, you may reconnect your

network as it was before.

This section applies to the Wireless Cable/DSL Gateway only.

■ Ensure that you have a Wi-fi certified 802.11b wireless adapter for

each wireless computer, and that it is correctly installed and
configured. Verify that each Wireless computer has either Windows
95 or higher or MAC OS 8.5 or higher.

■ Verify that your wireless computers are configured to work in

Infrastructure mode and not Ad Hoc mode. The Gateway contains an
Access Point that is designed to operate in Infrastructure mode. Ad
Hoc mode is not supported by the Gateway.

■ Check the status of the Gateway Wireless LED, it should be lit if

wireless is enabled and will flash when there is wireless activity. If not
lit go to “

Wireless Settings” on page 46 and enable wireless

networking.

■ Ensure that the TCP/IP settings for all devices are correct.

78 CHAPTER 6: TROUBLESHOOTING

■ Ensure that the Wireless Clients are using the same SSID or Service

■ Ensure that you are using the same level of security on all of your

■ Ensure that you have the Wireless computer enabled in the list of

■ If you are having difficulty connecting or are operating at a low speed

■ Sources of interference: The 2.4Ghz ISM band is used for 802.11b.

Area Name as the Gateway. The SSID is case-sensitive

wireless computers (None, 40/64 or 128 bit) and that all devices are
using the same keys, and the same order of keys where appropriate.

allowed MAC addresses if you are using Wireless Connection control
on the Gateway.

try changing the antenna positions on the rear of the Gateway. For
more effective coverage you can try reorientating your antennae.
Place one antenna vertically and one horizontally to improve coverage.
Additionally consider moving the wireless computer closer to the
Gateway to confirm that the building structure or fittings are not
adversely affecting the connectivity. If this resolves the problem
consider relocating the Wireless computer or the Gateway, or trying a
different channel on the Gateway.

This is generally a licence free band for low power applications, and
you may have other devices at your location that operate in this
frequency band. You should take care to ensure that there are no
devices like microwave ovens for example close to the Gateway or
wireless computers as this could affect receiver sensitivity and reduce
the performance of your network. If you are unsure try relocating both
the wireless computers and the Gateway to establish whether this
problem exists.

■ Most wireless computer Adapters will scan the channels for the

wireless Gateway. If a wireless computer has not located the Gateway
then try initiating a search manually if the client software supports this
feature or manually set the channel on your wireless computer to
correspond to the Gateway channel number. Please refer to your
Wireless computer adapter documentation and vendor to do this.

■ Speed of connection: The 802.11b standard will automatically choose

the best speed depending on the quality of your connection. As the
signal quality weakens then the speed falls back to a lower speed. The
speeds are 11Mbps, 5.5Mbps, 2Mbps and 1Mbps. In general the
closer you are to the Gateway the better the speed. If you are not
achieving the speed you had anticipated then try moving the antenna
on the Gateway or moving the Wireless computer closer to the
Gateway. In an ideal network the Gateway should be located in the

Alert LED 79

centre of the network with Wireless computers distributed around it.
Applications are generally available with the computer wireless card to
carry out a site survey. Use this application to find the optimal siting
for your wireless computer. Consult your Computer Card
documentation and vendor for more details.

Alert LED The Alert LED will flash when the Gateway unit is first powered up while

the system software checks the hardware for proper operation. Once the
Gateway has started normal operation, the Alert LED will go out.

■ If the Alert LED does not go out following start up, but illuminates

continuously, this indicates that the software has detected a possible
fault with the hardware. Remove power from the Gateway, wait 10
seconds and then re-apply power. If the Alert LED comes on
continuously again, then a fault has been detected. Locate the copy of
the Gateway software on the accompanying CD-ROM or 3Com web

http://www.3com.com) and upload it to the Gateway to see if

site (
this clears the fault (refer to “Recovering from Corrupted Software”
below). If this does not fix the problem, contact your supplier for
further advice.

Recovering from Corrupted Software

■ During normal operation, you may notice the Alert LED lighting briefly

from time to time. This indicates that the Gateway has detected a
hacker attack from the Internet and has prevented it from harming
your network. You need take no specific action on this, unless you
decide that these attacks are happening frequently in which case you
may wish to discuss this with your ISP. The Gateway logs such attacks,
and this information is available through the Status and Logs screens.

If the Alert LED remains permanently on following power-up, it is possible
that the system software has become corrupted. In this condition, the
Gateway will enter a “recovery” state; DHCP is disabled, and the LAN IP
address is set to 192.168.1.1. Follow the instructions below to upload a
new copy of the system software to a Gateway unit in this state.

Ensure that one of your computers has a copy of the new software image
file stored on its hard disk or available on CD-ROM.

The latest software is available on 3Com’s Web site at:

www.3com.com.

80 CHAPTER 6: TROUBLESHOOTING

1 Remove power from the Gateway and disconnect the Cable/DSL modem

and all your computers, except for the one computer with the software

image.
2 You will need to reconfigure this computer with the following static IP

address information:

■ IP address: 192.168.1.2

■ Subnet mask: 255.255.255.0

■ Default Gateway address: 192.168.1.1

3 Restart the computer, and re-apply power to the Gateway.
4 Using the Web browser on the computer, enter the following URL in the

location bar:

http://192.168.1.1.

This will connect you to the Microcode Recovery utility in the Gateway.
5 Follow the on-screen instructions. Enter the path and filename of the

software image file.
6 When the upload has completed, the Gateway will restart, run the

self-test and, if successful, resume normal operation. The Alert LED will

go out.

Frequently Asked Questions

7 Refer to the Installation Guide to reconnect your Gateway to the

Cable/DSL modem and the computers in your network. Do not forget to

reconfigure the computer you used for the software upload.

If the Gateway does not resume normal operation following the upload,

it may be faulty. Contact your supplier for advice.

How do I reset the Gateway to Factory Defaults?

Forgotten Password and Reset to Factory Defaults” on

See “

page 76

.

How many computers on the LAN does the Gateway support?

A maximum of 253 computers on the LAN are supported.

How many wireless clients does the Wireless Cable/DSL Gateway

support?

A maximum of 32 wireless clients are supported.

Frequently Asked Questions 81

There are only 4 LAN ports on the Gateway. How are additional
computers connected?

You can expand the number of connections available on your LAN
by using hubs, switches and wireless access points connected to
the Gateway. 3Com wireless access points and OfficeConnect hubs
and switches provide a simple, reliable means of expanding your
network; contact your supplier for more information, or visit:

http://www.3com.com/

Does the Gateway support virtual private networks (VPNs)?

The Gateway supports VPN passthrough, which allows VPN clients
on the LAN to communicate with VPN hosts on the Internet. It is
also possible to set up VPN hosts on your LAN that clients
elsewhere on the Internet can connect to, but this is not a
recommended configuration.

Where can I download software upgrades for the Gateway?

Upgrades to the Gateway software are posted on the 3Com
support web site, accessible by visiting:

http://www.3com.com.

What other online resources are there?

The 3Com Knowledgebase at:

http://knowledgebase.3com.com

is a database of technical information covering all 3Com products.
It is updated daily with information from 3Com technical support
services, and it is available 24 hours a day, 7 days a week.

82 CHAPTER 6: TROUBLESHOOTING

A

USING DISCOVERY

Running the Discovery Application

Windows Installation

(95/98/2000/Me/NT)

3Com provides a user friendly Discovery application for detecting the
Gateway on the network.

1 Insert the Gateway CD-ROM in the CD-ROM drive on your computer. A

menu will appear; select Gateway Discovery.

Discovery will find the Gateway even if it is unconfigured or
misconfigured.

Figure 62 Discovery Welcome Screen

2 When the Welcome screen is displayed click on Next and wait until the

application discovers the Gateways connected to your LAN.

84 APPENDIX A: USING DISCOVERY

Figure 63 Discovered Gateway Screen

3 Figure 64 shows an example Discovered Devices screen. Highlight the

Wireless Cable/DSL Gateway by clicking on it, and press Next.

Figure 64 Discovery Finish Screen

4 Click on Finish to launch a web browser and display the login page for

the Gateway.

B

IP ADDRESSING

The Internet Protocol Suite

Managing the Gateway over the Network

IP Addresses and

Subnet Masks

The Internet protocol suite consists of a well-defined set of
communications protocols and several standard application protocols.
Transmission Control Protocol/Internet Protocol (TCP/IP) is probably the
most widely known and is a combination of two of the protocols (IP and
TCP) working together. TCP/IP is an internationally adopted and
supported networking standard that provides connectivity between
equipment from many vendors over a wide variety of networking
technologies.

To manage a device over the network, the Gateway must be correctly
configured with the following IP information:

■ An IP address

■ A Subnet Mask

Each device on your network must have a unique IP address to operate
correctly. An IP address identifies the address of the device to which data
is being sent and the address of the destination network. IP addresses
have the format n.n.n.x where n is a decimal number between 0 and 255
and x is a number between 1 and 254 inclusive.

However, an IP Address alone is not enough to make your device operate.
In addition to the IP address, you need to set a subnet mask. All networks
are divided into smaller sub-networks and a subnet mask is a number
that enables a device to identify the sub-network to which it is
connected.

86 APPENDIX B: IP ADDRESSING

For your network to work correctly, all devices on the network must have:

■ The same sub-network address.

■ The same subnet mask.

The only value that will be different is the specific host device number.

This value must always be unique.

An example IP address is ‘192.168.100.8’. However, the size of the

network determines the structure of this IP Address. In using the

Gateway, you will probably only encounter two types of IP Address and

subnet mask structures.

Typ e O ne

In a small network, the IP address of ‘192.168.100.8’ is split into two

parts:

■ Part one (‘192.168.100’) identifies the network on which the device

■ Part two (‘.8’) identifies the device within the network.

resides.

This type of IP Address operates on a subnet mask of ‘255.255.255.0’.

See Ta bl e 3

for an example about how a network with three computers

and a Gateway might be configured.

Tab le 3 IP Addressing and Subnet Masking

Device IP Address Subnet Mask

PC 1 192.168.100.8 255.255.255.0
PC 2 192.168.100.33 255.255.255.0
PC 3 192.168.100.188 255.255.255.0
Gateway 192.168.100.72 255.255.255.0

Typ e Tw o

In larger networks, where there are more devices, the IP address of

‘192.168.100.8’ is, again, split into two parts but is structured differently:

■ Part one (‘192.168’) identifies the network on which the device

resides.

■ Part two (‘.100.8’) identifies the device within the network.

How does a Device Obtain an IP Address and Subnet Mask? 87

This type of IP Address operates on a subnet mask of ‘255.255.0.0’.

See Ta bl e 4

for an example about how a network (only four computers

represented) and a Gateway might be configured.

Tab le 4 IP Addressing and Subnet Masking

Device IP Address Subnet Mask

PC 1 192.168.100.8 255.255.0.0
PC 2 192.168.201.30 255.255.0.0
PC 3 192.168.113.155 255.255.0.0
PC 4 192.168.002.230 255.255.0.0
Gateway 192.168.002.72 255.255.0.0

How does a Device Obtain an IP Address and Subnet Mask?

There are three different ways to obtain an IP address and the subnet
mask. These are:

■ Dynamic Host Configuration Protocol (DHCP) Addressing

■ Static Addressing

■ Automatic Addressing (Auto-IP Addressing)

DHCP Addressing The Gateway contains a DHCP server, which allows computers on your

network to obtain an IP address and subnet mask automatically. DHCP
assigns a temporary IP address and subnet mask which gets reallocated
once you disconnect from the network.

®

DHCP will work on any client Operating System such as Windows

95,
Windows 98 or Windows NT 4.0. Also, using DHCP means that the same
IP address and subnet mask will never be duplicated for devices on the
network. DHCP is particularly useful for networks with large numbers of
users on them.

Static Addressing You must enter an IP Address and the subnet mask manually on every

device. Using a static IP and subnet mask means the address is
permanently fixed.

Auto-IP Addressing Network devices use automatic IP addressing if they are configured to

acquire an address using DHCP but are unable to contact a DHCP server.
Automatic IP addressing is a scheme where devices allocate themselves

88 APPENDIX B: IP ADDRESSING

an IP address at random from the industry standard subnet of

169.254.x.x (with a subnet mask of 255.255.0.0). If two devices allocate
themselves the same address, the conflict is detected and one of the
devices allocates itself a new address.

Automatic IP addressing support was introduced by Microsoft in the
Windows 98 operating system and is also supported in Windows 2000.

TECHNICAL SPECIFICATIONS

C

This section lists the technical specifications for the OfficeConnect
Cable/DSL Gateway and the Wireless Cable/DSL Gateway.

Cable/DSL Gateway Interfaces

Cable or DSL modem connection - 10/100 FD.

LAN connection - four 10Mbps/100Mbps dual speed Ethernet ports
(10BASE-T/100BASE-TX)

Operating Temperature

0 °C to 40 °C (32 °F to 105 °F)

Power

7VA, 23.9 BThU/hr

Humidity

0 % to 90 % (non-condensing) humidity

Dimensions

■ Width = 220 mm (8.7 in.)

■ Depth = 135 mm (5.3 in.)

■ Height = 24 mm (1 in.)

Weight

Approximately 535 g (1.2 lbs)

Standards Functional: ISO 8802/3

IEEE 802.3

90 APPENDIX C: TECHNICAL SPECIFICATIONS

Safety: UL 1950, EN 60950

EMC: EN 55022 Class B

Environmental: EN 60068 (IEC 68)

CSA 22.2 #950
IEC 60950

EN 55024
AS/NZS 3548 B
FCC Part 15 Class B*
ICES-003 Class B
VCCI Class B
CNS 13438 Class A

*See “

Safety Information” on page 95 for conditions of operation.

System Requirements Operating Systems

The Cable/DSL Gateway will support the following Operating Systems:

■ Windows 95/98

■ Windows NT 4.0

■ Windows ME

■ Windows 2000

■ Windows XP

■ Mac OS 8.5 or higher

■ Unix

Ethernet Performance The Cable/DSL Gateway complies to the IEEE 802.3i, u and x

specifications.

Cable Specifications The Cable/DSL Gateway supports the following cable types and

maximum lengths:

■ Category 3 (Ethernet) or Category 5 (Fast Ethernet or Dual Speed

Ethernet) Twisted Pair — shielded and unshielded cable types.

■ Maximum cable length of 100m (327.86 ft).

91

Wireless Cable/DSL
Gateway

Interfaces

Cable or DSL modem connection - 10/100 FD.

LAN connection - four 10Mbps/100Mbps dual speed Ethernet ports
(10BASE-T/100BASE-TX)

WLAN Interface

Standard IEEE 802.11b, Direct Sequence Spread Spectrum (DSSS)
Transmission rate: 11Mbps, automatic fallback to 5.5, 2 or 1Mbps
Maximum channels: 13
Range up to 304.8m (1000ft)
Frequency: (US/Canada/Europe) 2.400-2.4835 GHz
Sensitivity: 1,2,5.5Mbps: -80dBm; 11Mbps -76dBm typical
Modulation: CCK, BPSK, QPSK
Encryption: 40/64bit, 128 bit WEP
Maximum clients: 32
O/P Power 15dBm

Operating Temperature

0 °C to 40 °C (32 °F to 105 °F)

Power

7VA, 23.9 BThU/hr

Humidity

0 % to 90 % (non-condensing) humidity

Dimensions

■ Width = 220 mm (8.7 in.)

■ Depth = 135 mm (5.3 in.)

■ Height = 24 mm (1 in.)

Weight

Approximately 592 g (1.3 lbs)

92 APPENDIX C: TECHNICAL SPECIFICATIONS

Standards Functional: ISO 8802/3

Safety: UL 1950, EN 60950

EMC: EN 55022 Class B

Radio CFR 47 FCC Part 15.207, 15.209, 15.247 and 15.249.

IEEE 802.3
IEEE 802.11b, WiFi

CSA 22.2 #950
IEC 60950

EN 55024
AS/NZS 3548 B
FCC Part 15 Class B*
ICES-003 Class B
CNS 13438 Class A
ETS 300-826

ETS 300 328 (2.4 GHz ISM band wide band transmission
systems.

Environmental: EN 60068 (IEC 68)

*See “

Safety Information” on page 95 for conditions of operation.

System Requirements Operating Systems

The Wireless Cable/DSL Gateway will support the following Operating
Systems:

■ Windows 95/98

■ Windows NT 4.0

■ Windows ME

■ Windows 2000

■ Windows XP

■ Mac OS 8.5 or higher

■ Unix

Ethernet Performance The Wireless Cable/DSL Gateway complies to the IEEE 802.3i, u and x

specifications.

Wireless Performance The Wireless Cable/DSL Gateway complies with the IEEE 802.11b

specification and conforms to the WiFi interoperability test standard.

Cable Specifications The Wireless Cable/DSL Gateway supports the following cable types and

maximum lengths:

■ Category 3 (Ethernet) or Category 5 (Fast Ethernet or Dual Speed

Ethernet) Twisted Pair — shielded and unshielded cable types.

■ Maximum cable length of 100m (327.86 ft).

93

94 APPENDIX C: TECHNICAL SPECIFICATIONS

D

Important Safety
Information

SAFETY INFORMATION

WARNING: Warnings contain directions that you must follow for your
personal safety. Follow all directions carefully.
You must read the following safety information carefully before you
install or remove the unit:

WARNING: The Gateway generates and uses radio frequency (rf) energy.
In some environments, the use of rf energy is not permitted. The user
should seek local advice on whether or not rf energy is permitted within
the area of intended use.

WARNING: Exceptional care must be taken during installation and
removal of the unit.

WARNING: Only stack the Gateway with other OfficeConnect units.

WARNING: To ensure compliance with international safety standards,

only use the power adapter that is supplied with the unit.

WARNING: The socket outlet must be near to the unit and easily
accessible. You can only remove power from the unit by disconnecting
the power cord from the outlet.

WARNING: This unit operates under SELV (Safety Extra Low Voltage)
conditions according to IEC 950. The conditions are only maintained if
the equipment to which it is connected also operates under SELV
conditions.

WARNING: There are no user-replaceable fuses or user-serviceable
parts inside the Gateway. If you have a physical problem with the unit
that cannot be solved with problem solving actions in this guide,
contact your supplier.

96 APPENDIX D: SAFETY INFORMATION

WARNING: Disconnect the power adapter before moving the unit.

WARNING: RJ-45 ports. These are shielded RJ-45 data sockets. They

cannot be used as telephone sockets. Only connect RJ-45 data
connectors to these sockets.

Wichtige
Sicherheitshinweise

VORSICHT: Warnhinweise enthalten Anweisungen, die Sie zu Ihrer
eigenen Sicherheit befolgen müssen. Alle Anweisungen sind sorgfältig
zu befolgen.
Sie müssen die folgenden Sicherheitsinformationen sorgfältig
durchlesen, bevor Sie das Geräts installieren oder ausbauen:

VORSICHT: Der Gateway erzeugt und verwendet Funkfrequenz (RF). In
manchen Umgebungen ist die Verwendung von Funkfrequenz nicht
gestattet. Erkundigen Sie sich bei den zuständigen Stellen, ob die
Verwendung von Funkfrequenz in dem Bereich, in dem der Bluetooth
Access Point eingesetzt werden soll, erlaubt ist.

VORSICHT: Bei der Installation und beim Ausbau des Geräts ist mit
höchster Vorsicht vorzugehen.

VORTSICHT: Stapeln Sie das Geräts nur mit anderen OfficeConnect
Gerätes zusammen.

VORSICHT: Aufgrund von internationalen Sicherheitsnormen darf das
Gerät nur mit dem mitgelieferten Netzadapter verwendet werden.

VORSICHT: Die Netzsteckdose muß in der Nähe des Geräts und leicht
zugänglich sein. Die Stromversorgung des Geräts kann nur durch
Herausziehen des Gerätenetzkabels aus der Netzsteckdose
unterbrochen werden.

VORSICHT: Der Betrieb dieses Geräts erfolgt unter den
SELV-Bedingungen (Sicherheitskleinstspannung) gemäß IEC 950. Diese
Bedingungen sind nur gegeben, wenn auch die an das Gerät
angeschlossenen Geräte unter SELV-Bedingungen betrieben werden.

Consignes
importantes de
sécurité

97

VORSICHT: Es sind keine von dem Benutzer zu ersetzende oder zu
wartende Teile in dem Gerät vorhanden. Wenn Sie ein Problem mit
dem Gateway haben, das nicht mittels der Fehleranalyse in dieser
Anleitung behoben werden kann, setzen Sie sich mit Ihrem Lieferanten
in Verbindung.

VORSICHT: Vor dem Ausbau des Geräts das Netzadapterkabel
herausziehen.

VORSICHT: RJ-45-Anschlüsse. Dies sind abgeschirmte
RJ-45-Datenbuchsen. Sie können nicht als Telefonanschlußbuchsen
verwendet werden. An diesen Buchsen dürfen nur RJ-45-Datenstecker
angeschlossen werden.

AVERTISSEMENT: Les avertissements présentent des consignes que
vous devez respecter pour garantir votre sécurité personnelle. Vous
devez respecter attentivement toutes les consignes.
Nous vous demandons de lire attentivement les consignes suivantes de
sécurité avant d’installer ou de retirer l’appareil:

AVERTISSEMENT: La Gateway fournit et utilise de l'énergie
radioélectrique (radio fréquence -rf). L'utilisation de l'énergie
radioélectrique est interdite dans certains environnements. L'utilisateur
devra se renseigner sur l'autorisation de cette énergie dans la zone
prévue.

AVERTISSEMENT: Faites très attention lors de l'installation et de la
dépose du groupe.

AVERTISSEMENT: Seulement entasser le moyer avec les autres moyeux
OfficeConnects.

AVERTISSEMENT: Pour garantir le respect des normes internationales
de sécurité, utilisez uniquement l'adaptateur électrique remis avec cet
appareil.

AVERTISSEMENT: La prise secteur doit se trouver à proximité de
l’appareil et son accès doit être facile. Vous ne pouvez mettre l’appareil
hors circuit qu'en débranchant son cordon électrique au niveau de
cette prise.

98 APPENDIX D: SAFETY INFORMATION

AVERTISSEMENT: L’appareil fonctionne à une tension extrêmement
basse de sécurité qui est conforme à la norme CEI 950. Ces conditions
ne sont maintenues que si l'équipement auquel il est raccordé
fonctionne dans les mêmes conditions.

AVERTISSEMENT: Il n’y a pas de parties remplaceables par les
utilisateurs ou entretenues par les utilisateurs à l’intérieur du moyeu. Si
vous avez un problème physique avec le moyeu qui ne peut pas être
résolu avec les actions de la résolution des problèmes dans ce guide,
contacter votre fournisseur.

AVERTISSEMENT: Débranchez l'adaptateur électrique avant de retirer
cet appareil.

AVERTISSEMENT: Ports RJ-45. Il s'agit de prises femelles blindées de
données RJ-45. Vous ne pouvez pas les utiliser comme prise de
téléphone. Branchez uniquement des connecteurs de données RJ-45 sur
ces prises femelles.

END USER SOFTWARE LICENCE

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A

3Com Corporation
END USER SOFTWARE LICENSE AGREEMENT

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100 APPENDIX E: END USER SOFTWARE LICENCE AGREEMENT

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