Hewlett Packard Enterprise WL537S User Manual

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OfficeConnect

Wireless 54Mbps/108Mbps 11g Cable/DSL Router User Guide

3CRWER100-75(Model:WL-537) 3CRWER200-75(Model:WL-537S)

http://www.3com.com/

3Com Corporation 350 Campus Drive Marlborough, MA USA 01752-3064

Copyright © 2006, 3Com Corporation. All rights reserved. No part of this documentation may be reproduced in any form or by any means or used to make any derivative work (such as translation, transformation, or adaptation) without written permission from 3Com Corporation.

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

3Com Corporation provides this documentation without warranty, term, or condition of any kind, either implied or expressed, including, but not limited to, the implied warranties, terms or conditions of merchantability, satis34factory quality, and fitness for a particular purpose. 3Com may make improvements or changes in the product(s) and/or the program(s) described in this documentation at any time.

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

UNITED STATES GOVERNMENT LEGEND

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

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

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

3Com, OfficeConnect and the 3Com logo are registered trademarks of 3Com Corporation. Intel and Pentium are registered trademarks of Intel Corporation. Microsoft, MS-DOS, Windows, and Windows

NT are registered trademarks of Microsoft Corporation. Novell and NetWare are registered trademarks of Novell, Inc. UNIX is a registered trademark in the United States and other countries, licensed exclusively through X/Open Company, Ltd.

Netscape Navigator is a registered trademark of Netscape Communications.

JavaScript is a trademark of Sun Microsystems Wi-Fi and the Wi-Fi logo are registered trademarks of the WI-Fi Alliance. IEEE and 802 are trademarks of the Institute of Electrical and Electronics Engineers, Inc.

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

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It is the policy of 3Com Corporation to be environmentally-friendly in all operations. To uphold our policy, we are committed to:

Establishing environmental performance standards that comply with national legislation and regulations.

Conserving energy, materials and natural resources in all operations.

Reducing the waste generated by all operations. Ensuring that all waste conforms to recognized environmental standards. Maximizing the recyclable and reusable content of all products.

Ensuring that all products can be recycled, reused and disposed of safely.

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Improving our environmental record on a continual basis.

End of Life Statement

3Com processes allow for the recovery, reclamation and safe disposal of all end-of-life electronic components.

Regulated Materials Statement

3Com products do not contain any hazardous or ozone-depleting material.

Environmental Statement about the Documentation

The documentation for this product is printed on paper that comes from sustainable, managed forests; it is fully biodegradable and recyclable, and is completely chlorine-free. The varnish is environmentally-friendly, and the inks are vegetable-based with a low heavy-metal content.

ABOUT THIS GUIDE

This guide describes how to install and configure the OfficeConnect Wireless 54Mbps/108Mbps 11g cable/DSL Router(3CRWER100-75 and 3CRWER200-75).

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 Router systems.

If a release note is shipped with the OfficeConnect Wireless

54Mbps/108Mbps 11g cable/DSL Router 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

and contains information that

Naming Convention Throughout this guide, the OfficeConnect Wireless 54Mbps/108Mbps!

11g Cable/DSL Router is referred to as the “Router”.

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 Ta bl e 2 list conventions that are used throughout this guide.

Table 1 Notice Icons

Icon Notice Type Description

Information note Information that describes important features or

instructions.

Caution Information that alerts you to potential loss of data or

potential damage to an application, system, or device.

Warning Information that alerts you to potential personal

injury.

Table 2 Text Conventions

Convention Description

The words “enter” and “type”

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

Words in italics Italics are used to:

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

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

Press Ctrl+Alt+Del

■ 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 54Mbps/108Mbps 11g cable/DSL Router User

Guide

■ Part Number DUA0554-TAAA02

■ 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 Router document set includes one Installation Guide. This guide contains the instructions you need to install and configure your Router.

10 ABOUT THIS GUIDE

INTRODUCING THE ROUTER

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 54Mbps/108Mbps 11g cable/DSL Router

The OfficeConnect Wireless 54Mbps/108Mbps 11g cable/DSL Router is designed to provide a cost-effective means of sharing a single broadband Internet connection amongst several wired and wireless computers. The Router 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 Router 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 Router. In this network,

12 CHAPTER 1: INTRODUCING THE ROUTER

Figure 1 Example Network Without a Router

When you use the Router in your network (Figure 2), it becomes your connection to the Internet. Connections can be made directly to the Router, 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 11g Cable/DSL Router

Router Advantages The advantages of the Router 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

Router Advantages 13

Package Contents The Router kit includes the following items:

■ One OfficeConnect Wireless 54Mbps/108Mbps 11g cable/DSL Router

■ One power adapter for use with the Router

■ Four rubber feet

■ One Ethernet cable

■ One CD-ROM containing the Quick Installation Guide!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 ROUTER

Minimum System and Component Requirements

Your Router 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 Router.

■ 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 Router contains a series of indicator lights (LEDs)

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

Figure 3 Router - Front Panel

1 Alert LED

Orange

Indicates a number of different conditions, as described below.

Off - The Router is operating normally.

Flashing quickly - Indicates one of the following conditions:

Front Panel 15

■ The Router has just been started up and is running a self-test routine,

■ 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 Router has completed the current operation and the alert LED is Off.

Flashing slowly - The Router 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 Router will then enter the start-up sequence and resume normal operation.

On for 2 seconds, and then off - The Router has detected and prevented a hacker from attacking your network from the Internet.

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

“Troubleshooting”.

2Power LED

Green

Indicates that the Router 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 Router, or there is a problem. Refer to Chapter 6

“Troubleshooting”.

4 Four LAN Status LEDs

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

5 Cable/DSL Status LED

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

If the LED is on, the link between the Router 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 Router contains four LAN ports, one

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

Figure 4 Router - Rear Panel

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 Router. Do not use any other adapter.

8 Power Adapter OK LED

Green

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

Rear Panel 17

9 Ethernet Cable/DSL port

Use the supplied patch cable to connect the Router 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 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 Router 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 ROUTER

HARDWARE INSTALLATION

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

including:

■ Connecting the Router to the Internet.

■ Connecting the Router to your network.

■ Setting up your computers for networking with the Router.

Safety Information

Positioning the Router

WARNING: Please read the “ before you start.

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

AVERTISSEMENT: Veuillez lire attentivement la section “

importantes de sécurité” avant de mettre en route.

You should place the Router 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

Router. 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.

Safety Information” section in Appendix D

Wichtige Sicherheitshinweise”

Consignes

20 CHAPTER 2: HARDWARE INSTALLATION

When positioning your Router, 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 Router 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 Router.

Stacking the Router If you are stacking your Router with other OfficeConnect units, install the

Router at the top of the stack. Refer to the documentation supplied with your other OfficeConnect unit for details on using the stacking clip.

A stacking clip is not supplied with the Router. Use the stacking clip supplied with another stackable OfficeConnect unit.

Wall Mounting There are two slots on the underside of the Router 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.

Before you Install your Router 21

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 Router

Before you install and configure your Router, 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 : ______________________

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 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 : ____.____.____.____

22 CHAPTER 2: HARDWARE INSTALLATION

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

IP Address : ____.____.____.____

Subnet Mask : ____.____.____.____

Default Router address : ____.____.____.____

DNS address : ____.____.____.____

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 Router

Connecting the Router

To power up the Router:

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

back panel of the Router.

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

The first step for installing your Router 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 Router

Connecting the Router 23

Power Supply Unit

11g Cable/DSL Router

V 2 1

A 5 2 . 1

Your existing Cable/DSL Modem

S D /

e l

b a C

O R E

W O P

N A L

Wireless Users

Internet

Your PC

To use your Router 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 Router.

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 Router.

3 Connect the cable or DSL modem to the Internet.

4 Connect your computer to one of the four LAN ports on the Router using

a Category 5 twisted pair cable. Check that the corresponding LAN status LED on the Router lights.

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

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

If you configure the Router from a wireless computer, note that you may lose contact with the Router if you change the wireless configuration.

24 CHAPTER 2: HARDWARE INSTALLATION

To communicate wirelessly with your Router, your wireless NIC should be set as follows:

■ Encryption — none

■ Service Area Name/SSID — 3Com

■ Channel — 11

SETTING UP YOUR COMPUTERS

The Router 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 Router CD-ROM to detect and configure your Router. Refer to Appendix A program.

for information on using the Discovery

Obtaining an IP Address Automatically

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

Refer to the section below which relates to your operating system for details on how to obtain an IP address automatically.

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.

Obtaining an IP Address Automatically 27

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

change your TCP/IP settings:

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.

Windows 95/98/ME If you are using a Windows 95/98/ME 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. 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 Router.

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 Router 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 Router.

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 Router Login Screen

5 If the password is correct, the Country Selection screen will appear. Select

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

)

If your purchased your Router in the United States, you do not see this screen, as it is automatically set.

Figure 11 Country Selection Screen

Accessing the Wizard 31

6 When you have selected a country either:

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

and click Wizard.

■ If your Router 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

32 CHAPTER 4: RUNNING THE SETUP WIZARD

Figure 13 Wizard Screen

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 Router for the first time. The Router is shipped from the factory with a default password, admin.

1. Password is case sensitive.

Accessing the Wizard 33

2. Write the new password down and keep it in a safe place, so that you can change your settings in the future.

Time Zone

WAN Settings

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.

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.

Figure 16 Internet Settings Screen

This Internet Addressing Mode window allows you to set up the Router for the type of Internet connection you have. Before setting up your

34 CHAPTER 4: RUNNING THE SETUP WIZARD

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)

■ ISP provides configuration dynamically (via DHCP)

■ ISP has provided a static IP address

■ PPTP is required (some DSL users in Europe)

and click Next.

PPPoE Mode

Figure 17 PPPoE Screen

To setup the Router 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.

Accessing the Wizard 35

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

4 Enter the MTU value supplied by your ISP in the MTU text box. If your ISP

has not supplied an MTU value, leave this at the default value. The default is 1454.

5 Select an idle time from the Maximum Idle Time drop down list. This is

the amount of time without Internet activity that you want to allow before the Router ends the PPPoE session.

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

Dynamic IP Address Mode

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

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

click Next.

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

36 CHAPTER 4: RUNNING THE SETUP WIZARD

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 was previously connected directly to the cable modem, choose Yes ,

please clone the MAC address from the PC I’m currently using.

Static IP Mode

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

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

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 Router 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 Router 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 Enter the value supplied by your ISP in the MTU text box. If your ISP has

not supplied an MTU value, leave this at the default value. The default is

1460.

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

the amount of time without Internet activity that you want to allow before the Router ends the PPTP session.

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

displays.

38 CHAPTER 4: RUNNING THE SETUP WIZARD

Figure 22 PPTP IP Settings

8 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.

Heart Beat Signal Mode(For Australia only)

Figure 23 Heart Beat Signal Mode Screen

Accessing the Wizard 39

To set up the Router for use with an L2TP connection, use the following procedure:

1 IT is a service used in Australia only. If you are using Heart Beat Signal

connection, check with your ISP for the necessary setup information.

2 Enter the User Name and Password you use when logging nonto your ISP

through a Heart Beat connection.

40 CHAPTER 4: RUNNING THE SETUP WIZARD

LAN Settings Figure 24 LAN IP Address Screen

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

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

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

Figure 25 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 26 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 from the Channel drop-down list allows the Router to automatically select an available channel when first powered on.

Accessing the Wizard 41

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.

Click Next when you have finished.

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

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

42 CHAPTER 4: RUNNING THE SETUP WIZARD

channel you select as this may be useful if you experience problems with your clients.

Summary Figure 27 Configuration Summary Screen

When you complete the Setup Wizard, a configuration summary will display. 3Com recommends that you verify the configuration information of the Router and then print this page for your records. Click Finish to display the Wizard completed screen, shown in Figure 28

Accessing the Wizard 43

Figure 28 Wizard Completed Screen

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 Router again.

Your Router is now configured and ready for use.

See Chapter 5

for a detailed description of the Router configuration

screens.

44 CHAPTER 4: RUNNING THE SETUP WIZARD

ROUTER CONFIGURATION

Navigating Through the Router Configuration Pages

Main Menu At the left side of all screens is a main menu, as shown in Figure 29

This chapter describes all the screens available through the Router configuration pages, and is provided as a reference. To get to the configuration pages, browse to the Router 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 Router LAN IP address during initial configuration, use the new IP address instead. When you have browsed to the Router, log in using your system password (default admin).

page 46

appear in the main part of the screen.

■ Welcome — displays the firmware version of the Router, allows you to

■ 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

change your password, and launch the Wizard

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

configures WPA or WEP encryption, and provides facilities for improving the security of the wireless network.

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

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

Virtual Servers, Special Applications, PCs Privileges, URL Filtering, Content Filtering and SPI options

■ System Tools — allows the administrator to perform maintenance

activities on the Router.

46 CHAPTER 5: ROUTER CONFIGURATION

■ Advanced — allows you to monitor and configure the Router’s

advanced features, including RIP, DDNS and Security.

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

Router.

■ Support/Feedback — contains a comprehensive online help system

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

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

accessed through the use of tabs (see Figure 29

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.

Notice Board Figure 29 Notice Board Screen

Welcome Screen 47

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 30 Password Screen

Changing the Administration Password

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

1 Enter the current password in the Old Password field

2 Enter the new password in the New Password field

3 Enter the new password again in the Confirm Password field

4 Click Apply to save the new password

The password is case sensitive.

If you have forgotten your password you need to reset the Router.

48 CHAPTER 5: ROUTER CONFIGURATION

Wizard Figure 31 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 32 Unit Configuration Screen

LAN Settings 49

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

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

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

Router is 192.168.1.1.

2 If you want to use the Router as a DHCP Server, check the Enable check

box.

3 Clicking Auto Range will automatically choose the largest available range

of addresses for your network. Alternatively, you can change the address range by changing the last digit(s) of the IP Pool Start Address, or the IP Pool End Address, or both.

4 If you use 3Com NBX telephones, enter the IP address of the NBX call

processor at 3Com NBX Call Processor.

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

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

Static DHCP Assignment

DHCP Clients List

Figure 33 Static DHCP Assignment Screen

Click on the DHCP Client Tab to display a list of all the DHCP clients in your network.

50 CHAPTER 5: ROUTER CONFIGURATION

Wireless Settings

The Wireless Settings menu provides options described in the following sections.

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

1.Change the SSID from its default value

2.Enable Encryption

3.Enable Connection Control

LAN Settings 51

Configuration

Figure 34 Configuration Screen

Enable Wireless Networking

Use this check box to enable or disable the wireless secion 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 Router.

Channel Selection

Select a number from the drip-down list to specify which Channel the Router will transmit and receive on. If another access point or Router 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 Router.

Choose the Clear Channel Select option to automatically choose the clearest channel. The Router 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.

52 CHAPTER 5: ROUTER CONFIGURATION

Service Area Name/SSID

This allows you to name your Wireless network. The Service Area Name/SSID 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 Router uses the name "3Com". 3Com recommends that you change the default name.

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

■ Use Infrastructure Mode not Ad hoc Mode

■ Have the same Service Area Name as the Router.

■ Have the same Channel number as the Router.

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

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

Connection Control is enabled.

Enable Broadcase SSID

Disable this feature after you have installed your wireless network to improve the security of your network. When the check box is checked, the Router will broadcast the Service Area Name/SSID of your wireless network, whick reduces the security of your Router as it allows any wireless client to see your wireless LAN.

If you have a wireless client that can detect all the available SSIDs in your area, your client will not list the Router SSID unless this feature is enabled. THe clients will still be able to connect, provided that they are supplied with the SSID.

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

SSID

If required, enter a name that you want to use to uniquely identify the device at the SSID prompt.

LAN Settings 53

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.

You can configure wireless security such as WEP or WPA encryption on this screen. Note: it is recommended that you use WPA encryption over WEP if your wireless clients support WPA All of the wireless clients must use the same security settings in order to connecdt to the router.

■ 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.

If you enable encryption on the Router, 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 Router secure data transmitted through wireless communications between the Router and its wireless clients. Enabling encryption has no security effect on data transmitted through wired (Ethernet) connections or through your connections to the Internet.

54 CHAPTER 5: ROUTER CONFIGURATION

WEP

To enable WEP, select WEP from the Security Mode.

Encryption: Choose from 64 bits or 128 bits

Passphrase:You can enter a passphrase and click on the Generate

button and the router will automatically generate four WEP keys for you.

WEP Key1-4:Manaually assign a passphrase for each key. If you selected 64 bits encryption, enter 10 HEX characters (0-F) for each key. If you selected 128 bits encrtpyion,enter 26 HEX characters (0-F) for each key.

TX Key:Select a key to be the active key.

Click Save to save the setting

LAN Settings 55

WPA

To enable WPA, select WPA-PSK or WPA2-PSK from the Security Mode.

Encryption Methods: Select either TKIP or AES as the encryption

method.

Passphrase:Enter a passphrase between 8 to 63 characters long.

Key Renewal:Enter the desired key renewal time in seconds.

Click Save to save the setting.

56 CHAPTER 5: ROUTER CONFIGURATION

WPA!with RADIUS

If you are using a RADIUS server in your network for authentication, you may choose WPA or!WPA2 from the Security Mode.

Encryption Methods: Select either TKIP or AES as the encryption method.

RADIUS Server:Enter the IP Address of your RADIUS server.

RADIUS Port:;Enter the port number of your RADIUS server.

Shared Key:Enter the shared key.

Key Renewal:Enter the desired key renewal time in seconds.

Click Save to save the setting.

LAN Settings 57

Connection Control

You can restrict certain wireless clients from accessing the router by specifying their MAC address and enabling access restrictn.

Select Enabled from the drop-down menu and choose whether the specified wireless clients will be prevented or permitted to access the wireless network. Enter their MAC address in the fields below and click

Save to save the setting.!

58 CHAPTER 5: ROUTER CONFIGURATION

Client List

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 Router can support).

LAN Settings 59

Advanced Wireless Settings

Internet Settings

Advanced Wireless Settings Screen

You can configure various advanced wireless settings on this screen. Click Save to save the setting.

Before you can configure the Router, you need to know the IP information allocation method used by your ISP. There are four different ways that ISP scan allocate IP information, as described below:

Static IP Address (DSL or Cable)

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

■ IP Address

■ Subnet Mask

■ ISP Router

■ DNS address(es)

Dynamic IP Address (DSL or Cable)

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

PPPoE (DSL only)

If the installation instructions that accompany your modern ask you to install a PPPoE client on your PC, then select this option. To configure the

60 CHAPTER 5: ROUTER CONFIGURATION

Router you will need to know the following:

■ User name

■ Password

■ Service Name(ifrequired by your ISP)

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

LAN Settings 61

PPTP (DSL or Cable)

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

■ User name

■ Password

■ VPN Server address(usually your moderm)

When you install the Router, you will not need to use the dialup VPN on your PC anymore.

Heart Beat Signal(For Australia only)

It is a service used in Australia only. If you are using Heart Beat Signal

connection, check with your ISP for the necessary setup information.

User Name and Password

Enter the User Name and Password you use when logging onto your

ISP through a Heart Beat Signal connection.

Connection to ISP Before beginning this section, ensure you have the required information

from your ISP.

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

■ Dynamic IP address (automatically allocated)

■ PPPoE (used by DSL providers only)

■ PPTP (used by some European providers)

■ Heart Beat Signal(supported by some ISPs)

62 CHAPTER 5: ROUTER CONFIGURATION

Static IP Address

Connection Parameters Screen - Static IP

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

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

Mode field.

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 Router, and you should go to

step 7

3 Enter your subnet mask in the Subnet Mask text box.

4 Enter your ISP Router 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 Save.

LAN Settings 63

Dynamic IP Address

Figure 35 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 Router for use with a dynamic IP address connection:

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

Mode field.

2 Enter the Host Name(optional).

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

3 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 Router’s original Internet MAC address - This field is selected

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

64 CHAPTER 5: ROUTER CONFIGURATION

■ 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 Router. 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.

4 Check all settings and click Save.

PPP over Ethernet

PPPoE Setup Screen

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

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

2 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.

LAN Settings 65

3 Enter your PPP over Ethernet user name in the PPPoE User Name text box.

4 Enter a password in the PPPoE Password text box.

5 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.

6 Enter the MTU value supplied by your ISP. If you do not know this, leave it

at the default value. The default is 1454.

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 Router automatically ends your PPP over Ethernet session.

Since the Router contains its own PPPoE client, you no longer need to run PPPoE client software on your computer to access the Internet.

PPTP

PPTP Setup Screen

66 CHAPTER 5: ROUTER CONFIGURATION

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

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

field.

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

typically the address of your modem).

3 Enter your PPTP user name in the PPTP User Name text box.

4 Enter your password in the PPTP Password text box.

5 Enter the MTU value supplied by your ISP. If you do not know this, leave it

at the default value. The default is 1460.

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 Router automatically ends your PPTP session.

7 IP settings must be used when establishing a PPTP connection. To obtain

an IP address

■ Fill in the Initial IP Address, Initial Subnet Mask fields if your ISP has

provided you with these settings.

Check all of your settings, and then click Save.

LAN Settings 67

Heart Beat Signal

Check with your ISP to make sure they support Heart Beat Signal.

To set up the Router for use with a Heart Beat Signal connection, use the following procedure:

1 Select Heart Beat Signal (For Australia only) in the IP Allocation Mode

field.

2 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.

3 Enter your Heart Beat Signal user name in the Heart Beat Signal User

Name text box.

4 Enter your Heart Beat Signal password in the Heart Beat Signal Password

text box.

5 Enter the MTU value supplied by your ISP. If you do not know this, leave it

at the default value. The default is 1440.

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 Router automatically ends your PPTP session.

Check all of your settings, and then click Save.

68 CHAPTER 5: ROUTER CONFIGURATION

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

Virtual Servers, Special Applications, PCs Privileges, URL Filter, Content Filter and SPI.

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

Servers setup screen.

Virtual Servers Screen

Virtual DMZ

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 Save.

Firewall 69

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.

If you want to host ftp server or online gaming, you must open up ports on the router. This page allows you to setup port forwarding for the specified applications.

Before using forwarding, you should assian static IP addresses to the designated PCs.

Click Save to save the settings.

70 CHAPTER 5: ROUTER CONFIGURATION

Special Applications Special Applications Screen

Select Special Apps tab to display Authorized Application setup screen.

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

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

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

Special Application allows the router to keep track of outgoing data for

specific port numbers. The router remembers which computer sends out what data, so when the requested data returns through the router, the data is sent back to the proper computer by way of IP address and port mapping rules.

Click Save to save the setting.

Firewall 71

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

SPI Select Firewall from the main menu, then select the SPI to display the SPI screen.!SPI Screen

Check the Enable SPI and Anti-Dos Firewall protection check box to enable SPI.!When this feature is enabled, all incoming packets will be blocked except for those types that you allow in the Stateful Packet Inspection section.

Web Filters:You can select to filter Proxy, Java, ActiveX, and/or Cookies.

Click Save to save the setting.

72 CHAPTER 5: ROUTER CONFIGURATION

QOS QoS(Quality of Service) manages information as it is transmitted and

received. It ensures better service to those application with a higher priority.

Click Save to save the setting. Internet Access Policy You can setup policies that deny or allow specific clients to access the

Internet.

Enter Policy Name;!Enter a name for the ploicy.

Firewall 73

Status:Choose to enable or disable the selected policy.

PCs:Click on the Edit List button to specify the network clients. Policy

only applies to the PCs that are in the list.

You can specify each client by its MAC Addressor IP Address. You can also specify a group of clients by entering their IP Address Range. Once you have specified all the clients, click Save.

Access Restrictions: Select to Deny or Allow the specified clients to access the Internet by Day and Time.

Blocked Application Port

Select which application port to block, if any, when the specified PCs have Internet access.

For your convenience, 11 preset applications and their ports are listed. If you have a Custom application, select Custom and manually enter its port number.

74 CHAPTER 5: ROUTER CONFIGURATION

Website Blocking

You can block the specified clients from accessing certain websites by URL or Keyword.

Enter the URL or the Keyword you wish to block.

Click Save to save the setting.

To view all the policies, click the Summary button.

Firewall 75

Contnet!Filter You can subscribe to the 3Com Content Filter Service, which enables you

to block or allow the URL of a number of pre-defined categories.

The Router comes with a 14-day free trial of the 3Com Content Filter Service. To activate the 14-day free trial of the service, you must first register your Router at www.3com.com. To continue using the service after the trial period, you must purchase the Full 3Com Content Filter Service(3CS8CFS).

URL Filtering rules supersede content filtering rules. If the 3Com Content Filter is blocking certain Web sites that you want to allow, you can add these sites to URL Filter's allow list.

76 CHAPTER 5: ROUTER CONFIGURATION

To activate Content Filtering:

1 Select Firewall form the main menu, then select the Content Filter tab.

The Content Filter screen displays.

Figure63!Content Filter Screen

2 Make sure the Enable Content Filter check box is checked.

3 Select the Content Filter Server that you require from the drop-down list.

If you select custom entry, enter the server IP address in the text box.

4 Select the Server Timeout value in milliseconds. The default is 3000

milliseconds (3 seconds).

5 Select Allow or Deny for each displayed category, as required.

Click Apply to save the settings.

Click Save to save the settings.

Firewall 77

System Tools

The main frame of the System Tools screen includes four administration items: Restart, Time Zone, Configuration, and Upgrade.

Restart Restart Screen

If your Router is not operating correctly, you can choose to restart the Router by selecting Restart the Router, 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 thier computers when the restart has completed and the Router is operational again.

78 CHAPTER 5: ROUTER CONFIGURATION

Time Zone 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 Day Light savings box, and then click Save.

The Router 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 Configuration Screen

Select the Configuration tab to display the Configuration screen .

Backup Configuration

Firewall 79

Click BACKUP to save the current Router 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 Router's memory.

The password will remain unchanged.

Reset to Factory Default

If you want to reset the settings on your Router to those that were loaded at the factory, click RESET. You will lose all your configuration changes. The Router 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 Router.

80 CHAPTER 5: ROUTER CONFIGURATION

Upgrade Upgrade Screen

The Upgrade facility allows you to install on the Router 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 Router, and once this has completed, the Router 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 Router is lost while the new software is being copied to the Router).

Advanced 81

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 Router during the upgrade procedure; if you do, the software may be corrupted and the Router may not start up properly afterwards. .

Advanced Selecting Advanced from the main menu displays the following five tabs

in your Web browser window: Static Route, RIP, Security

Static Route The Router supports static route functionality. Select the Static Route tab

to display the screen/

Static Route screen

and!Syslog.

The following information is displayed for each static route:

■ Index - the index of the static route

■ Network Address - the network address of the route. If network

address and subnet mask are both set to 0.0.0.0, this is the default route.

■ Subnet Mask - the subnet mask of the route. If network address and

subnet mask are both set to 0.0.0.0, this is the default route.

■ Gateway - the gateway used to route data to the network specified by

the network address.

82 CHAPTER 5: ROUTER CONFIGURATION

RIP The Router supports the Routing Information Protocol (RIP). RIP allows

you to set up routing information on one RIP enabled device, and have that routing information replicated to all RIP enabled devices on the network. LAN and WAN interfaces can be configured independently of each other.

Select the RIP tab to display the screen/

RIP screen

Check the Enable RIP Mode check box to configure RIP on the Router.

Advanced 83

DDNS Dynamic Domain Name Server (DDNS) enables you to map a static

domain name to a dynamic IP address. The Router supports two DDNS providers, TZO.com and DYNDNS.org. Before you can set up DDNS, you must obtain an account, password and static domain name from your DDNS provider. DDNS is disabled by default.

To set up DDNS:

1 Select Advanced from the main menu, then select the DDNS tab. The

DDNS screen displays.

DDNS screen

84 CHAPTER 5: ROUTER CONFIGURATION

2 Select a DDNS Service provider from the drop-down list. This can be

either TZO.com or DynDNS.org.

TZO.com

If you select TZO.com:

1 In the Domain Name text box, enter the domain name.

2 In the E-mail text box, enter the account name.

3 In the Key text box, enter the account password.

4 Click Save to make this service active.

DynDNS.org

If you select DYNDNS.org:

1 In the Host Name text box, enter the host name.

2 In the Username text box, enter the account name.

3 In the Password text box, enter the account password.

4 Click Save

to make this service active.!

Security Select Security to display the Security screen.

Security Screen

Advanced 85

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. The options in the Security tab features help you to protect your network.

Advanced Settings

The Advanced Settings section of the Security screen displays the following options:

■ Enable universal plug and play - Universal plug and play allows

compatible software to read and change some the Router’s firewall settings. This reduces the configuration required but lessens your control of the Router’s firewall.

Check on the check box to enable this feature, and then select Apply.

86 CHAPTER 5: ROUTER CONFIGURATION

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

Check on the check box to enable this feature, and then select Save.

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

■ Disable NAT - Network Address Translation (NAT) is the method by

which the Router shares the single IP address assigned by your ISP with the computers on the network. Only disable NAT if your ISP assigns you multiple IP addresses or you need NAT disabled for an advanced system configuration. If you have a single IP address and your turn NAT off, the computers on your network will not be able to access the Internet. Other problems may also occur.

Check on the check box to disable NAT, and then select Save.

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

Enabling Remote Administration

It is possible to administer the Router remotely. Select one of the following options for remote administration:

■ Disable Remote Administration - This option is set as default.

■ Enable administration from a single Internet Host - Only the specified

Host IP Address can manage the Router. Any other users will be rejected.

■ Enable administration from a whole subnet - This option allows a

number of users within the specified Host Network Address and Subnet Mask to administer the Router.

■ Enable administration from any Internet Host - This option allows any

host to access the administration pages.

To remotely administer your Router, 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 Router. You may then login using the administration password.

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

Syslog Select Syslog to display the syslog screen.

Advanced 87

Check on the check box to enable this feature, and then click Save.

88 CHAPTER 5: ROUTER CONFIGURATION

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

and Routing Table in yur Web browser window.

Logs

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

Internet connection.

Status Screen

Status and Logs 89

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

logged by the Router.

Logs Screen

Select Incoming Log or Outgoing Log from the Type drop-down menu. The Incoming Log will display a temporary log of the Source IP Addresses and Destination Port Numbers fo rthe incoming Internet trafic. Click the Save Log button to save this information to!a file on your PC's hard drive. Click the Refresh button to update the log. click the Clean button to clear all the information that is displayed.

The Outgoing Log will display a temporary log of the LAN IP Addresses, Destination URLs or IP Addresses, Destination URLs or IP Address, and Service or Port Numbers for the outgoing Internet traffic. Click the Save Log button to save this information to a file on your PC's hard drive. Click the Refresh button to update the log. Click the Clearn button to clear all the information that is displayed.

90 CHAPTER 5: ROUTER CONFIGURATION

Routing Table

Support/Feedback

Support Support Screen

Select the Routing table tab to display routing information used by the Router. The information is displayed in the form at shown as below.

Selecting Support/Feedback from the main menu displays the Support and Feedback screens.

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 Router/

Feedback Feedback Screen

Status and Logs 91

Selecting the Feedback option displays the Feedback screen and allows you to provide feedback to 3Com on the operation of your Router . This screen should not be used to obtain technical support.

92 CHAPTER 5: ROUTER CONFIGURATION

TROUBLESHOOTING

Basic Connection Checks

Browsing to the Router Configuration Screens

■ Check that the Router 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 Router 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 Router and computers together but cannot browse to the Router configuration screens, check the following:

■ Confirm that the physical connection between your computer and the

Router is OK, and that the LAN Status LEDs on the Router 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 Router to ensure that your computer receives an IP address.

, Setting Up Your Computers. Restart your computer while it

■ When entering the address of the Router 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

104 CHAPTER 6: TROUBLESHOOTING

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

■ If you still cannot browse to the Router, 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 Router. 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 Router is

192.168.1.1 (the address of the Router). If these are not correct, use the Release and Renew functions to obtain a new IP address from the Router. 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 Router configuration screens but cannot access sites on the Internet, check the following:

■ Confirm that the physical connection between the Router and the

cable/DSL modem is OK, and that the link status LEDs on both Router 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 Router

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 Router to ensure that the correct MAC address is presented.

■ 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 105

Forgotten Password and Reset to Factory Defaults

If you can browse to the Router configuration screen but cannot log on because you do not know or have forgotten the password, follow the steps below to reset the Router 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 Router 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 Router.

2 Disconnect all your computers and the cable/DSL modem from the

Router.

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

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

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

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

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

6 Re-apply power to the Router, 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 Router contains an Access Point that is designed to operate in Infrastructure mode. Ad Hoc mode is not supported by the Router.

106 CHAPTER 6: TROUBLESHOOTING

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

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

■ 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.

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

“Wireless Settings”

and enable wireless networking.

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

clients are the same as those configured on the Router. The Router 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 Router.

try changing the antenna positions on the rear of the Router. 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 Router 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 Router, or trying a different channel on the Router.

■ 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 Router 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 Router to establish whether this problem exists.

■ Most wireless computer Adapters will scan the channels for the

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

Power LED or Power Adapter OK LED Not Lit 107

■ 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 Router the better the speed. If you are not achieving the speed you had anticipated then try moving the antenna on the Router or moving the Wireless computer closer to the Router. In an ideal network the Router 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 Router 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 Router.

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

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

108 CHAPTER 6: TROUBLESHOOTING

Alternatively, quote the part number for your region:

Power Adapter Part Numbers

Part Number Region

3C16760 US and Canada

3C16761 UK

3C16762 Europe and Middle East

3C16763 Australasia (except Japan and Korea)

3C16764 South Africa

3C16766 Japan

3C16767 Korea

3C16768 Argentina

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

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

Recovering from Corrupted Software

■ 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 Router, 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 Router software on the accompanying CD-ROM or 3Com web site

http://www.3com.com) and upload it to the Router to see if 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 Router 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 Router logs such attacks, and this information is available through the Status and Logs screens.

If the Alert LED remains permanently on following power-up, it is possible that the system software has become corrupted. In this condition, the

Frequently Asked Questions 109

Router 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 Router 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 Router 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 Router address: 192.168.1.1

Frequently Asked Questions

3 Restart the computer, and re-apply power to the Router.

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 Router.

5 Follow the on-screen instructions. Enter the path and filename of the

software image file.

6 When the upload has completed, the Router 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 Router 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 Router does not resume normal operation following the upload, it may be faulty. Contact your supplier for advice.

How do I reset the Router to Factory Defaults?

Forgotten Password and Reset to Factory Defaults”.

See “

110 CHAPTER 6: TROUBLESHOOTING

How many computers on the LAN does the Router support?

How many wireless clients does the Cable/DSL Router support?

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

Does the Router support virtual private networks (VPNs)?

A maximum of 253 computers on the LAN are supported.

A maximum of 128 wireless clients are supported.

You can expand the number of connections available on your LAN by using hubs, switches and wireless access points connected to the Router. 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/

The Router 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 Router?

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

http://www.3com.com

What other online resources are there?

The 3Com Knowledgebase at:

http://knowledgebase.3com.com

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

USING DISCOVERY

Running the Discovery Application

Windows Installation

(95/98/2000/Me/NT)

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

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

menu will appear; select Router Discovery.

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

Discovery Welcome Screen

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

application discovers the Routers connected to your LAN.

112 APPENDIX A: USING DISCOVERY

Discovered Router Screen

3 Highlight the Cable/DSL Router by clicking on it, and press Next.

Discovered Finish!Screen

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

the Router.

IP ADDRESSING

The Internet Protocol Suite

Managing the Router 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 Router 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.

114 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 Router, you will probably only encounter two types of IP Address and subnet mask structures.

Type O n e

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 an example about how a network with three computers and a Router might be configured.

Table 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

Router 192.168.100.72 255.255.255.0

Type 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.

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