E-10 User’s Reference Guide

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 available 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 R3100), a Netopia R3100, and a number of other hosts. Router A maintains a link to the Internet, and may be used as the default gateway.

Internet

a.b.c.16

a.b.c.1

Router A

a.b.c.0

a.b.c.2

Router B

Router C

a.b.c.128

a.b.c.129

a.b.c.248

a.b.c.249

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Netopia R3100 manual Nested IP subnets, Internet