Using Reserved Ip Addresses - Coyote Point Systems E350GX Installation And Administration Manual

Appendix C:

Using Reserved IP Addresses

RFC 1918 defines blocks of internet IP addresses that will never be officially assigned to any entity, and will not be
routed through the Internet. This means that any site can use these reserved, non-routable networks in their interanet:
• the class A network
• the class B networks
• the class C networks
In environments in which the conservation of IP addresses is important, using reserved IP addresses can minimize
the number of "real" IP addresses needed. For example, an ISP hosting several hundred unique web sites replicated
on three servers might not want to assign real IP addresses for all of them because each virtual cluster would
consume four addresses: three on the back-end servers and one for the virtual cluster. In this case, the ISP might use
10.0.0.0 as the internal network and assign virtual server addresses out of this network for the servers. Figure 64
shows an example of a reserved network configuration, where Equalizer uses public IP addresses on one subnet for
clusters, and reserved IP addresses for servers.
Figure 64 Servers using reserved IP addresses
Equalizer Installation and Administration Guide
10.0.0.0/8 (10.0.0.0 to 10.255.255.255)
172.16.0.0/12 (172.16.0.0 to 172.31.255.255)
192.168.0.0/16 (192.168.0.0 to 192.168.255.255)
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