3Com 3CRWER100-75 Router Manual PDF (Setup & Configuration Guide)

Page 96 / 128 Scroll up to view Page 91 - 95

110

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HAPTER

6: T

ROUBLESHOOTING

How many computers on the LAN does the Router support?

A maximum of 253 computers on the LAN are supported.

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

A maximum of 128 wireless clients are supported.

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

computers connected?

You can expand the number of connections available on your LAN

by using hubs, switches and wireless access points connected to

the 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/

Does the Router support virtual private networks (VPNs)?

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.

Page 97 / 128

A

U

SING

D

ISCOVERY

Running the

Discovery

Application

3Com provides a user friendly Discovery application for detecting the

Router on the network.

Windows Installation

(95/98/2000/Me/NT)

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

application discovers the Routers connected to your LAN.

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112

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PPENDIX

A: U

SING

D

ISCOVERY

3

Highlight the

Cable/DSL Router

by clicking on it, and press

4

Click on

Finish

to launch a web browser and display the login page for

the Router.

Discovered Finish

!

Screen

Discovered Router Screen

Page 99 / 128

B

IP A

DDRESSING

The Internet

Protocol Suite

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.

Managing the

Router over the

Network

To manage a device over the network, the Router must be correctly

configured with the following IP information:

■

An IP address

■

A Subnet Mask

IP Addresses and

Subnet Masks

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.

Page 100 / 128

114

A

PPENDIX

B: IP A

DDRESSING

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 One

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

resides.

■

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

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

Type Two

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.

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

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