3COM 3CRWE554G72 User Manual

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OfficeConnect®

Wireless 11g Cable/DSL Gateway User Guide

3CRWE554G72

http://www.3com.com/

Part No. DUA0055-4AAA01 Rev. 01 Published July 2003

3Com Corporation 5500 Bayfront Plaza Santa Clara, California 95052-8145

Copyright © 2003, 3Com Corporation. All rights reserved. No part of this documentation may be reproduced in any form or by any means or used to make any derivative work (such as translation, transformation, or adaptation) without written permission from 3Com Corporation.

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

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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 Wireless 11g 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

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 42

Password 43

Wizard 44 LAN Settings 44

Unit Configuration 44

DHCP Clients List 45 Wireless Settings 47

Configuration 47

Encryption 49

Configuring WPA Encryption 49

Configuring WEP Encryption 50

Connection Control 53

Client List 55

Profile 55 Internet Settings 57

Connection to ISP 58 Firewall 63

Virtual Servers 63

Special Applications 65 PC Privileges 67 URL Filter 69 Security 73

System Tools 75

Restart 75 Time Zone 76 Configuration 77 Upgrade 78

Status and Logs 78

Status 79 Usage 79 Logs 80

Support/Feedback 80

Support 81 Feedback 81

6 TROUBLESHOOTING

Basic Connection Checks 83 Browsing to the Gateway Configuration Screens 83 Connecting to the Internet 84 Forgotten Password and Reset to Factory Defaults 85 Wireless Networking 85

Replacement Power Adapters 87 Alert LED 88 Recovering from Corrupted Software 89 Frequently Asked Questions 90

A USING DISCOVERY

Running the Discovery Application 93

Windows Installation (95/98/2000/Me/NT) 93

B IP ADDRESSING

The Internet Protocol Suite 95 Managing the Gateway over the Network 95

IP Addresses and Subnet Masks 95

How does a Device Obtain an IP Address and Subnet Mask? 97

DHCP Addressing 97 Static Addressing 97 Auto-IP Addressing 97

C TECHNICAL SPECIFICATIONS

Standards 100

D SAFETY INFORMATION

E END USER SOFTWARE LICENSE AGREEMENT

F ISP INFORMATION

GLOSSARY

INDEX

REGULATORY NOTICES FOR THE WIRELESS 11G CABLE/DSL G

ATEWAY

ABOUT THIS GUIDE

This guide describes how to install and configure the OfficeConnect Wireless 11g Cable/DSL Gateway (3CRWE554G72).

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 Wireless 11g 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 Wireless 11g Cable/DSL

Gateway is 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:

pddtechpubs_comments@3com.com

Please include the following information when commenting:

■ Document title

■ Document part number (on the title page)

■ Page number (if appropriate)

Conventions 9

Example:

■ OfficeConnect Wireless 11g Cable/DSL Gateway User Guide

■ Part Number DUA0055-4AAA01

■ 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.

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://www.3com.com/register/

10 ABOUT THIS GUIDE

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 Wireless 11g Cable/DSL Gateway

The OfficeConnect Wireless 11g Cable/DSL Gateway is 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. The Gateway can also prevent your users from accessing Web sites which you find unsuitable.

Figure 1

only one computer is connected to the Internet. This computer must always be powered on for the other computers on the network to access the Internet.

shows an example network without a Gateway. In this network,

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 both wired and wireless computers

■ High speed 802.11g wireless networking

■ 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

■ Filtered access of inappropriate Web sites using the built-in URL filter

Package Contents The Gateway kit includes the following items:

■ One OfficeConnect Wireless 11g 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 or 802.11g wireless NIC.

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

connector).

■ An active Internet access account.

■ A Web browser that supports JavaScript, such as Netscape 4.7 or

higher, Internet Explorer 5.0 or higher, or Mozilla 1.2.1 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

21 43

WLAN

Alert Enabled

LAN Status Cable/DSL

3CRWE554G72

OfficeConnect Wireless 11g 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:

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

routine, or

Front Panel 15

■ 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 85

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 Wireless LAN (WLAN) Status LED

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”.

4 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

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, a power adapter OK LED, and a power adapter socket.

Figure 4 Gateway - Rear Panel

6 6

7 9 108

Ethernet

Cable/

DSL

LAN

6 Wireless Antennae

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

CAUTION: Do not force the antennae beyond their mechanical stops. Rotating the antennae further may cause damage.

7 Power Adapter Socket

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

8 Power Adapter OK LED

Green

Indicates that the power adapter is supplying power to the Gateway. If the LED is off, there may be a problem with the power adapter or adapter cable.

9 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, and will set itself to MDI or MDIX

Rear Panel 17

depending on the device to which they are connected and the type of cable used.

10 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 will automatically set themselves to MDI or MDIX depending on the device to which they are connected and the type of cable used.

18 CHAPTER 1: INTRODUCING THE GATEWAY

HARDWARE INSTALLATION

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 “Safety Information” before you start.

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

AVERTISSEMENT: Veuillez lire attentivement la section “Consignes

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.

■ 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 optimize wireless connections to computers in both

horizontal and vertical directions, allowing wider coverage.

■ 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.

section in Appendix D

20 CHAPTER 2: HARDWARE INSTALLATION

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.

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

Before you Install your Gateway 21

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, Password and PPTP Server Address:

PPTP User Name : ______________________

PPTP Password : ______________________

PPTP Server Address : ____.____.____.____

You only need a PPPoE Service Name 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

Power Supply Unit

3Com OfficeConnect Wireless 11g Cable/DSL Gateway

Your existing Cable/DSL Modem

Internet

Wireless Users

Your PC

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.

3 Connect the cable or DSL modem to the Internet.

Connecting the Gateway 23

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.

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 wirelessly with your Gateway, your wireless NIC should be set as follows:

■ Encryption — none

■ Service Area Name/SSID — 3Com

■ Channel — 11

24 CHAPTER 2: HARDWARE INSTALLATION

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.

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 4.7 or higher, Internet Explorer 5.0 or higher, or Mozilla 1.2.1 or higher).

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

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. Select

the country you wish to configure the Gateway for, then click Apply. (Figure 11

)

Figure 11 Country Selection Screen

6 When you have selected a country either:

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

and click Wizard. or

Accessing the Wizard 31

■ 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 57

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,

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

Wireless Settings Figure 25 Wireless Configuration Screen

This screen displays the Channel and Service Area Name. It also allows you to change these settings. There are a maximum of 14 channels, the number available to you is dependent on the country you reside in. Selecting Clear Channel Select allows the Gateway to automatically select an available channel when first powered on.

Accessing the Wizard 39

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.

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.

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

40 CHAPTER 4: RUNNING THE SETUP WIZARD

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.

For information on improving your Wireless network security see

Wireless Settings” on page 47.

“

See Chapter 5

for a detailed description of the Gateway configuration

screens.

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).

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 — enables /disables access from wireless computers,

■ 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, set up DHCP server parameters, and display the DHCP client list.

and provides facilities for improving the security of the wireless network.

and PPTP connections, allows you to clone the Gateway’s MAC address, and set up dynamic IP address allocation and static IP address settings.

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

Virtual Servers, Special Applications, PCs Privileges, URL Filtering 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/Feedback — contains a comprehensive online help system

and allows you to provide 3Com with feedback on your Gateway.

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

accessed through the use of tabs (see Figure 27

for example). To access a

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 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 27 Notice Board Screen

The Notice Board is used to display configuration warning messages. For example, you would be warned if you had disabled wireless networking or wireless encryption.

Password Figure 28 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

Welcome Screen 43

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.

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

Forgotten Password and Reset to Factory Defaults” on page 85

“

44 CHAPTER 5: GATEWAY CONFIGURATION

Wizard Figure 29 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 30 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 31 DHCP Clients List Screen

The DHCP Clients List provides details on the devices that have received IP addresses from the Gateway. 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 following information is displayed:

■ IP address — The Internet Protocol (IP) address issued to the client

machine.

■ Host Name — The client machine’s host name, if configured.

■ MAC Address — The Media Access Control (MAC) address of the

46 CHAPTER 5: GATEWAY CONFIGURATION

■ client’s network card.

■ Client Type — Whether the client is connected to the Gateway by

wired or wireless connection.

■ Fix — This box is checked if the IP address is fixed to the MAC address

of the client’s network card. Clients that have fixed addresses will get the same IP address each time they connect.

Check the box to fix an association. Uncheck the box to remove the fixed association.

As you connect more devices, the client list will grow to a maximum number of 253 clients.

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.

Adding Fixed DHCP Mappings

You can add Fixed Mappings so that the Gateway allocates an IP address chosen by you when it encounters a particular device.

You only need to create Fixed Mappings for devices that need a specific IP address. For devices that do not need a specific IP address, the Gateway will automatically allocate addresses.

To add a Fixed Mapping:

1 Click New. The DHCP Fixed Mapping Setup screen will be displayed. 2 Enter the MAC Address for which you want to create a Fixed Mapping in

the MAC Address of Client box.

The MAC Address must be entered as 6 hexadecimal pairs, e.g. 12-34-56-78-90-ab.

3 Enter the IP Address that you want to reserve in the IP Address for client

box.

4 Click Add to add the Fixed Mapping or Close to close the window

without adding the Fixed Mapping.

The Fixed DHCP Mapping will be displayed in the DHCP Clients list as a Fixed Association.

Wireless Settings

Configuration Figure 32 Configuration Screen

Wireless Settings 47

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

1. Change the SSID from its default value - see page 48

2. Enable Encryption - see page 49

3. Enable Connection Control - see page 53

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 through this Gateway.

Channel Selection

The Channel Selector allows you to specify which Channel the Gateway will transmit and receive on. If another access point or gateway 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 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.

48 CHAPTER 5: GATEWAY CONFIGURATION

Choose the Clear Channel Select option to automatically choose the clearest channel. The Gateway will check for the clearest channel whenever it is rebooted, powered up, and when the Clear Channel Select option is first applied.

Valid channels are country dependent. See “

Channels” on page 121 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 authorized Wireless PCs list if

Connection Control is enabled. See page 53

Enable Broadcast SSID

This feature can be used to improve the security of your wireless network. When the tickbox is checked, the Gateway will broadcast the Service Area Name/SSID of your wireless network. This will allow unauthorized 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 unless this feature is enabled. The clients will still be able to connect, provided that they are supplied with the SSID.

Wireless Settings 49

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

Encryption When setting up wireless networks, it is important to remember that with

encryption disabled, anyone with a Wireless PC can eavesdrop on your network. 3Com recommends that you get the network working with encryption disabled first and then enable it as the last step. This will simplify setting up your network.

The Gateway supports two types of encryption:

■ WPA — Wi-Fi Protected Access (WPA) is a 256 bit encryption method

with keys that change over time.

■ WEP — Wireless Equivalent Privacy (WEP) is a 64 bit or 128 bit

encryption method with user configurable fixed keys.

WPA provides a higher level of security, provided by its longer key and dynamic changes made to the key over time. 3Com recommends that you use WPA with any clients which support it.

Configuring WPA

Encryption

If you enable encryption 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.

The encryption methods used by the Gateway secure data transmitted through wireless communications between the Gateway and its wireless clients. Enabling encryption has no security effect on data transmitted through wired (Ethernet) connections or through your connections to the Internet.

The only configuration that is needed for WPA is to enter the pre-shared key. This key is used to start the dialog between the Gateway and the client. During this dialog, a new key is agreed, making it more difficult to eavesdrop on wireless networks encrypted using WPA, than those encrypted using WEP. The pre-shared key can be entered as a 256 bit series of hexadecimal digits or as a pass-phrase.

50 CHAPTER 5: GATEWAY CONFIGURATION

Figure 33 Encryption Keys Screen showing WPA configuration

To enter the pre-shared key as hexadecimal digits:

1 Select Enabled - Manual Pre-shared Key from the WPA Encryption Type

drop-down box.

Configuring WEP

Encryption

2 Enter a pair of hexadecimal digits in each of the 32 Key fields. Each field

can contain a hexadecimal number from 00 to ff, for example 1a.

3 Click Apply to generate the key.

To enter the pre-shared key as a pass-phrase:

1 Select Enabled - Pre-Shared Passphrase from the WPA Encryption Type

drop-down box.

2 Enter a phrase of between 8 and 63 characters in length in the

Passphrase field. This passphrase will be used to generate a 256 bit key.

3 Click Apply to generate the key.

There are two levels of WEP encryption available, 64 bit (sometimes referred to as 40 bit) and 128 bit. Use the WEP Encryption Type box to select the desired level.

Wireless Settings 51

Encryption Keys

Figure 34 Encryption Keys Screen showing WEP configuration

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

52 CHAPTER 5: GATEWAY CONFIGURATION

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.

■ 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 the key generation method you wish to use from the drop down list. 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.

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.

Connection Control Figure 35 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 same Service Area Name/SSID, channel and encryption settings as the Gateway can connect to it.

Wireless Settings 53

Select Only Authorized 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 Authorized Wireless PC list.

Authorized Wireless PCs

Figure 36 Connection Control Detail Screen

54 CHAPTER 5: GATEWAY CONFIGURATION

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

1 Press New. The screen shown in Figure 36 opens. 2 Select the MAC addresses of the Wireless PCs for which you want to

allow access.

To select multiple MAC addresses, hold down the Ctrl key while clicking on the addresses.

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, enter the MAC address in the appropriate fields. A MAC address consists of 12 characters. Valid characters are '0-9', and 'A-F'.

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 37

2 Modify the MAC address. 3 Press Apply to accept the changes.

Figure 37 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 38 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 55

Profile

Figure 39 Profile Screen

56 CHAPTER 5: GATEWAY CONFIGURATION

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:

■ 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 authorized Wireless PCs.

Internet Settings 57

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)

58 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 40 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 40

). 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 59

■ Dynamic IP address (automatically allocated) see page 60

■ PPPoE (used by DSL providers only) see page 61

■ PPTP (used by some European providers) see page 62

Internet Settings 59

Static IP Address

Figure 41 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 41

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.

60 CHAPTER 5: GATEWAY CONFIGURATION

Dynamic IP Address

Figure 42 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 42

)

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 61

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

62 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 44 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 44

)

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.

Firewall 63

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.

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

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

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

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

Servers setup screen. (Figure 45

)

Virtual DMZ

Figure 45 Virtual Servers Screen

64 CHAPTER 5: GATEWAY CONFIGURATION

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.

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 46

)

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 46

Figure 46 Virtual Servers Settings Screen

)

Firewall 65

Or select Custom to specify a suitable name for the service and then enter the port numbers required for that service. (Figure 47

Figure 47 Custom Setup Screen

)

4 Click Add to save the settings.

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 48 Special Applications Screen

Select Special Applications tab to display Authorized Application setup screen. (Figure 48

)

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

66 CHAPTER 5: GATEWAY CONFIGURATION

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 49

Figure 49 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 49

). These values correspond to the outbound port numbers

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.

Firewall 67

PC Privileges

Figure 50

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.

Figure 51 PC Privileges Screen

Select PC Privileges to display the PC Privilege setup screen (Figure 51).

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.

68 CHAPTER 5: GATEWAY CONFIGURATION

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 52

Figure 52 All PCs Setup Screen

In addition to the four authorized 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 53

Firewall 69

Figure 53 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.

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

In addition to the four authorized 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.

URL Filter Select URL Filter to control your clients’ access to Web sites. The

Gateway’s URL Filter has three settings:

■ Disabled — Users can browse all Web sites. None will be filtered.

■ Deny List — Users can browse all Web sites apart from those sites

listed in the deny list and those whose URLs contain keywords listed in the deny list. See “

■ Allow List — Users are unable to browse any Web sites except of

Deny List” on page 70.

those listed in the allow list and those whose URLs contain keywords listed in the allow list. See “

Allow List” on page 71.

70 CHAPTER 5: GATEWAY CONFIGURATION

Deny List

To allow users access to all Web sites except for those you choose to block, choose Deny List in the URL Filter Type drop-down box (Figure 54

Figure 54 URL Filter Screen showing Deny List

To filter a specific site, enter the URL for that site. For example, to stop your users from browsing a site called www.badsite.com, enter www.badsite.com or badsite.com in one of the fields.

If badsite.com has multiple sub-domains, such as this.badsite.com and that.badsite.com then you can either:

■ Block them individually by entering this.badsite.com in one field

and that.badsite.com in another. or

■ Block them by entering the keyword badsite.com into one of the

fields. This will block all URLs containing the string badsite.com. As well as blocking this.badsite.com and that.badsite.com, the keyword badsite.com would block searches that mentioned badsite.com in their domain name, for example www.notabadsite.com.

To filter a generic keyword enter it into one of the fields. You should exercise caution when choosing a keyword as many keywords are

Firewall 71

contained within other words. For example, filtering the word sex would filter the following example URLs:

■ www.sussex.com

■ www.thisexample.com

You can filter up to 30 keywords and URLs.

Computers that should not be subject to URL filtering can be excluded by ticking the Bypass URL Filter checkbox in the PC Privileges setup screen.

PC Privileges” on page 67.

See “

Allow List

To stop users from accessing any Web sites that you have not specifically allowed, choose Allow List in the URL Filter Type drop-down box (Figure 55

Figure 55 URL Filter Screen showing Allow List

To allow a specific site, enter the URL for that site. For example, to let your users browse a site called www.goodsite.com, enter www.goodsite.com or goodsite.com in one of the fields.

If goodsite.com has multiple sub-domains, such as this.goodsite.com and that.goodsite.com then you can either:

72 CHAPTER 5: GATEWAY CONFIGURATION

■ Allow them individually by entering this.goodsite.com in one

field and that.goodsite.com in another. or

■ Allow them by entering the keyword goodsite.com into one of the

fields. This will allow all URLs containing the string goodsite.com. As well as allowing this.goodsite.com and that.goodsite.com, the keyword goodsite.com would allow sites that had the string goodsite.com in their URL, for example xxxgoodsite.com.

To filter a generic keyword enter it into one of the fields. You should exercise caution when choosing a keyword as sites that you may wish to block may be allowed if you choose too general a keyword.

The Gateway filters all traffic from domains that have been blocked using the URL filter. If need to access an external mail server, FTP server or other named device outside your network, you must list it in one of the allow fields.

You can filter up to 30 keywords and URLs.

Computers that should not be subject to URL filtering can be excluded by ticking the Bypass URL Filter checkbox in the PC Privileges setup screen.

PC Privileges” on page 67.

See “

Security Select Security to display the Security screen (Figure 56).

Figure 56 Security Screen

Firewall 73

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.

Enable universal plug and play Universal plug and play allows compatible software to read and change some the Gateway’s firewall settings. This reduces the configuration required but lessens your control of the Gateway’s firewall.

3Com recommends that you leave this feature disabled for maximum security.

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.

74 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.

Enabling Remote Administration

It is possible to administer the Gateway remotely. This can be set to one of four different levels using the following 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 56

System Tools 75

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

items: Restart, Time Zone, Configuration, and Upgrade (Figure 57

Restart

Figure 57 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.

76 CHAPTER 5: GATEWAY CONFIGURATION

Time Zone Figure 58 Time Zone Screen

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 58

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 59 Configuration Screen

Select the Configuration tab to display the Configuration screen (Figure 59

System Tools 77

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.

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.

78 CHAPTER 5: GATEWAY CONFIGURATION

Upgrade Figure 60 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”.

“

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

and Logs screens in your Web browser window.

Status and Logs 79

Status The Status screen displays a tabular representation of your network and

Internet connection. (Figure 61

Figure 61 Status Screen

)

Usage Usage displays an approximate count of the traffic since the Gateway was

last reset. (Figure 62

)

The counts are approximate and should be used as a guide only. Contact your ISP for accurate logging information.

80 CHAPTER 5: GATEWAY CONFIGURATION

Figure 62 Usage Screen

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

logged by the Gateway.

Figure 63 Logs Screen

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

Support/Feedback Selecting Support/Feedback from the main menu displays the Support

and Feedback screens.

Support Figure 64 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 64

Support/Feedback 81

Feedback

Figure 65 Feedback Screen

82 CHAPTER 5: GATEWAY CONFIGURATION

Selecting the Feedback option displays the Feedback screen and allows you to provide feedback to 3Com on the operation of your Gateway (Figure 65

). This screen should not be used to obtain technical support.

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 Status and Cable/DSL Status LEDs on the Gateway are illuminated, and that any corresponding LEDs on the cable/DSL modem and the NIC 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 initialized 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 LAN 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).

■ 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

84 CHAPTER 6: TROUBLESHOOTING

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

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

Connections tab and click on the LAN Settings button at the bottom. Make sure that the Proxy Server option is unchecked.

Windows 95/98/ME to verify that your computer has received the correct address information from the Gateway. From the Start menu, 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 requires 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 60

■ For cable users, check whether your ISP requires a fixed Host Name. If

so, enter the required Host Name in the Internet Settings screen.

■ 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 85

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 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:

Wireless Networking

http://192.168.1.1

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.

■ Ensure that you have an 802.11b or 802.11g 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.

86 CHAPTER 6: TROUBLESHOOTING

■ If you have a wired and a wireless NIC in the same computer, ensure

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

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

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

■ Ensure that the encryption method and level that you use on 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

that the wired NIC is disabled.

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

Wireless Settings” on page 47 and enable wireless

networking.

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

clients are the same as those configured on the Gateway. The Gateway can simultaneously support WPA and WEP encryption, but can only support one configuration of each.

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.

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

802.11g. 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

Power LED or Power Adapter OK LED Not Lit 87

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 and 802.11g standards 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 supported by 802.11g are 54 Mbps, 48 Mbps, 36 Mbps, 24 Mbps, 18 Mbps, 12 Mbps, and 6 Mbps. The speeds supported by 802.11b are 11 Mbps, 5.5 Mbps, 2 Mbps and 1 Mbps. 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 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.

Power LED or Power Adapter OK LED Not Lit

Replacement Power

Adapters

■ Check that your Gateway is receiving power by looking at the status

of the Power LED on the front panel and the Power Adapter OK LED on the rear panel:

■ If both LEDs are lit green then the unit is receiving power.

■ If both LEDs are unlit then no power is being supplied to the unit.

Check that the power adapter is plugged into a working mains outlet and that the mains outlet is supplying power. If the mains socket is supplying power then the power adapter or power adapter connection may be faulty. See “

Replacement Power

Adapters” below.

■ If the Power Adapter OK LED is lit but the Power LED is unlit then

there may be a fault with your unit. Contact 3Com Technical Support.

■ Check that you are using the correct power adapter for your Gateway.

You should only use the power adapter supplied with your Gateway.

If both the Power Adapter OK LED and Power LED are off, check your power adapter connection. If the mains outlet is working and is capable of supplying power to other devices, contact 3Com Technical Support and ask for a replacement power adapter. Please quote the power

88 CHAPTER 6: TROUBLESHOOTING

adapter part number shown on the OfficeConnect power adapter you are using.

Alternatively, quote the part number for your region:

Tab le 3 Power Adapter Part Numbers

Part Number Region 3C16740A US and Canada 3C16741A UK 3C16742A Europe and Middle East 3C16743A Japan 3C16744A Australasia (except Japan and Korea) 3C16745A South Africa 3C16747A Korea 3C16748A Argentina

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.

■ 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.

Recovering from Corrupted Software 89

Recovering from Corrupted Software

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.

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.

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.

90 CHAPTER 6: TROUBLESHOOTING

Frequently Asked Questions

How do I reset the Gateway to Factory Defaults?

Forgotten Password and Reset to Factory Defaults” on

See “

page 85

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 128 wireless clients are supported.

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 updates for the Gateway?

Updates 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

Frequently Asked Questions 91

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.

92 CHAPTER 6: TROUBLESHOOTING

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 66 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.

94 APPENDIX A: USING DISCOVERY

Figure 67 Discovered Gateway Screen

3 Figure 68 shows an example Discovered Devices screen. Highlight the

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

Figure 68 Discovery Finish Screen

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

the Gateway.

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.

96 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 4

for an example about how a network with three computers

and a Gateway might be configured.

Tab le 4 IP Addressing and Subnet Masking

Device IP Address Subnet Mask

PC 1 192.168.100.8 255.255.255.0 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? 97

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

See Ta bl e 5 for an example about how a network (only four computers represented) and a Gateway might be configured.

Tab le 5 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 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

95,

98 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

This section lists the technical specifications for the OfficeConnect Wireless 11g Cable/DSL Gateway.

Wireless 11g Cable/DSL Gateway

Interfaces

Cable/DSL modem connection — 10Mbps/100Mbps dual speed Ethernet port (10BASE-T/100BASE-TX)

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

WLAN Interfaces

Standard IEEE 802.11g, Direct Sequence Spread Spectrum (DSSS) Transmission rate: 54Mbps, automatic fallback to 48, 36, 24, 18, 12, or 6Mbps Maximum channels: 14 Range up to 304.8m (1000ft) Frequency: (US/Canada/Europe) 2.400-2.4835 GHz Sensitivity: 6, 12, 18, 24, 36, 48 Mbps: -85 dBm;

54 Mbps -66 dBm typical Modulation: CCK, BPSK, QPSK, OFDM Encryption: 40/64 bit WEP, 128 bit WEP, WPA Maximum clients: 128 O/P Power: 18dBm

Standard IEEE 802.11b, Direct Sequence Spread Spectrum (DSSS) Transmission rate: 11bps, automatic fallback to 5.5, 2, or 1 Mbps Maximum channels: 14 Range up to 304.8m (1000ft) Frequency: (US/Canada/Europe) 2.400-2.4835 GHz Sensitivity: 1, 2, 5.5 Mbps: -85 dBm; 11 Mbps -82 dBm typical Modulation: CCK, BPSK, QPSK, OFDM

100 APPENDIX C: TECHNICAL SPECIFICATIONS

Encryption: 40/64 bit WEP, 128 bit WEP, WPA Maximum clients: 128 O/P Power 18dBm

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 500 g (1.1 lbs)

Standards Functional: ISO 8802/3

IEEE 802.3 IEEE 802.11b, 802.11g, Wi-Fi

Safety: UL60950

CSA 22.2 #60950 IEC 60950 EN 60950

EMC: EN 55022 Class B

EN 55024 CISPR 22 FCC Part 15 Class B* ICES-003 Class B CNS 13438 Class A ETSI EN 301 489–17

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

ETS 300 328 (2.4 GHz ISM band wide band transmission

3COM 3CRWE554G72 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

ABOUT THIS GUIDE

Naming Convention Throughout this guide, the OfficeConnect Wireless 11g Cable/DSL

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

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

INTRODUCING THE GATEWAY

OfficeConnect Wireless 11g Cable/DSL Gateway

Gateway Advantages

Package Contents The Gateway kit includes the following items:

Minimum System and Component Requirements

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

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

HARDWARE INSTALLATION

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

Safety Information

Positioning the Gateway

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

Before you Install your Gateway

Powering Up the Gateway

Connecting the Gateway

Obtaining an IP Address Automatically

SETTING UP YOUR COMPUTERS

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

Windows XP

Windows 95/98/ME

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

Disabling PPPoE and PPTP Client Software

Disabling Web Proxy

RUNNING THE SETUP WIZARD

Accessing the Wizard

Password Figure 14 Change Administration Password Screen

Time Zone

WAN Settings

LAN Settings

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

Wireless Settings Figure 25 Wireless Configuration Screen

Summary Figure 26 Configuration Summary Screen

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

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

Welcome Screen The Welcome section allows you to view the Notice board and to change

Notice Board

Password Figure 28 Password Screen

Wizard Figure 29 Wizard Screen

LAN Settings The LAN Settings menu provides the following options:

Unit Configuration Figure 30 Unit Configuration Screen

DHCP Clients List

Wireless Settings

Configuration Figure 32 Configuration Screen

Encryption

Connection Control Figure 35 Connection Control Screen

Client List Figure 38 Client List Screen

Profile

Internet Settings 57

Connection to ISP Figure 40 Connection to ISP Screen

Firewall 63

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

Special Applications

PC Privileges

URL Filter Select URL Filter to control your clients’ access to Web sites. The

Security Select Security to display the Security screen (Figure 56).

System Tools 75

Restart

Time Zone Figure 58 Time Zone Screen

Configuration Figure 59 Configuration Screen

Upgrade Figure 60 Upgrade Screen

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

Status The Status screen displays a tabular representation of your network and

Usage Usage displays an approximate count of the traffic since the Gateway was

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

Support/Feedback Selecting Support/Feedback from the main menu displays the Support

Support Figure 64 Support Screen

Feedback

TROUBLESHOOTING

Basic Connection Checks

Browsing to the Gateway Configuration Screens