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Understanding IP Addressing B-13
Internet
Router A
Router CRouter B
a.b.c.0
a.b.c.16
a.b.c.1
a.b.c.2
a.b.c.248
a.b.c.249
a.b.c.128
a.b.c.129
Nested IP subnets
Under certain situations, you may wish to
create remote subnets from the limited
number of IP addresses issued by your ISP
or other authority. You can do this using
connection profiles. These subnets can be
nested within the range of IP addresses
avaiilable to your network.
For example, suppose that you obtain the
Class C network address a.b.c.0 to be
distributed among three networks. This
network address can be used on your main
network while portions of it can be
subnetted to the two remaining networks.
Note: The IP address a.b.c.0 has letters in
place of the first three numbers to generalize
it for this example.
The figure at left shows a possible network
configuration following this scheme. The
main network is set up with the Class C
address a.b.c.0, and contains Router A
(which could be a Netopia Router), a Netopia
Router, and a number of other hosts. Router
A maintains a link to the Internet, and may
be used as the default gateway.
Routers B and C (which could also be
Netopia Routers) serve the two remote
networks that are subnets of a.b.c.0. The
subnetting is accomplished by configuring
the Netopia Router with connection profiles
for Routers B and C (see the following table).