3Com 3CRWE52196 manual Type One, Type Two

86APPENDIX B: IP ADDRESSING

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

■The same sub-network address.

■The same subnet mask.

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

This value must always be unique.

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

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 Table 3 for an example about how a network with three computers and a Gateway might be configured.

Table 3 IP Addressing and Subnet Masking

Device	IP Address	Subnet Mask
PC 1	192.168.100.8	255.255.255.0
PC 2	192.168.100.33	255.255.255.0
PC 3	192.168.100.188	255.255.255.0
Gateway	192.168.100.72	255.255.255.0

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.