3Com OfficeConnect 3C857 User Manual page 86

86 A B: IP A
PPENDIX 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
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
PC 1 192.168.100.8
PC 2 192.168.100.33
PC 3 192.168.100.188
Gateway 192.168.100.72
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.
Subnet Mask
255.255.255.0
255.255.255.0
255.255.255.0
255.255.255.0