Understanding IP Addressing B-13InternetRouter ARouter CRouter Ba.b.c.0a.b.c.16a.b.c.1a.b.c.2a.b.c.248a.b.c.249a.b.c.128a.b.c.129Nested IP subnetsUnder certain situations, you may wish tocreate remote subnets from the limitednumber of IP addresses issued by your ISPor other authority. You can do this usingconnection profiles. These subnets can benested within the range of IP addressesavaiilable to your network.For example, suppose that you obtain theClass C network address a.b.c.0 to bedistributed among three networks. Thisnetwork address can be used on your mainnetwork while portions of it can besubnetted to the two remaining networks.Note: The IP address a.b.c.0 has letters inplace of the first three numbers to generalizeit for this example.The figure at left shows a possible networkconfiguration following this scheme. Themain network is set up with the Class Caddress a.b.c.0, and contains Router A(which could be a Netopia Router), a NetopiaRouter, and a number of other hosts. RouterA maintains a link to the Internet, and maybe used as the default gateway.Routers B and C (which could also beNetopia Routers) serve the two remotenetworks that are subnets of a.b.c.0. Thesubnetting is accomplished by configuringthe Netopia Router with connection profilesfor Routers B and C (see the following table).
