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Understanding IP Addressing B-183
Routers B and C (which could also be Netopia R910s) serve the two remote networks that are subnets of
a.b.c.0. The subnetting is accomplished by configuring the Netopia R910 with connection profiles for Routers B
and C (see the following table).
The Netopia R910’s connection profiles for Routers B and C create entries in its IP routing table. One entry
points to the subnet a.b.c.128, while a second entry points to the subnet a.b.c.248. The IP routing table might
look similar to the following:
Connection profile Remote IP address Remote IP mask
Bits available for host
address
For Router B a.b.c.128 255.255.255.192 7
For Router C a.b.c.248 255.255.255.248 3
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