Applications
The size of the subnet mask. defines the subnet mask by using the specified number to reserve a series of contiguous bit locations from the start of the entire IP address. These reserved bit locations are then used as the network portion of the IP address.
For example, with a class C IP address, a subnet mask size of 26 will mask the 24 network address bits plus 2 host bits for the subnet address, resulting in 4 subnet addresses being created. (Note that depending on whether or not nonstandard subnets are allowed, not all of these addresses may be valid; see the sections on defining masks).
The configuration options described here are only for initial set up and configuration purposes. For more information on all of the configuration parameters available please refer to the router PPP Menus Reference Manual file on the accompanying
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