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19), but on different subnets. These two
computers would need a router or switch to communicate. Subnets can be useful to separate
workgroups.
CHAPTER 25 Setting Up Networks and Samba 510
Netmasks
Subnet masks, or just plain netmasks, are used by TCP/IP to show which octets are owned
by the network and which are owned by the host. You saw the standard netmasks earlier
in the chapter. You can use customized netmasks to organize subnets to fit your needs.
Even if you have a single Class C address, you can use netmasks to create subnets. You
don??™t have to use an entire octet to represent a network, you can subdivide an octet to
produce your own subnets.
Here??™s a simple example of using a unique subnet mask for a network. Instead of the standard
Class C address which uses three octets to represent the network portion of the IP
address, we??™ll add a part of the fourth octet to be used in the subnet mask. To determine
the number of bits to add to the subnet mask, you must first determine the number of
subnets you need to create in your network.


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