3com 3CRWE52196 User Guide

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.

An example IP address is ‘192.168.100.8’. However, the size of the 
network determines the structure of this IP Address. In using the 
Gateway, you will probably only encounter two types of IP Address and 
subnet mask structures.

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 

 for an example about how a network with three computers 

and a Gateway might be configured.

Table 3   IP Addressing and Subnet Masking

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.

PC 1

192.168.100.8

255.255.255.0

PC 2

192.168.100.33

255.255.255.0

PC 3

192.168.100.188

255.255.255.0

Gateway

192.168.100.72

255.255.255.0