Specifications

Equalizer Installation and Administration Guide 165
B Using Reserved IP Addresses
Equalizer supports placing servers on reserved, non-routable networks such as the class A network
10.0.0.0 and the class C network 192.168.2.0. 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 (the now-defunct Arpanet) as the internal network and assign virtual server addresses
out this network for the servers. Figure 67 illustrates a typical reserved internal network.
Figure 76 Reserved Internal Network
Note – Due to the additional overhead introduced by enabling outbound NAT, approach using
reserved internal networks with caution.
External
Network
199.145.85.0
Name
Server
Router
Equalizer
Servers
Internal
Network
10.0.0.0
Client
.12.11
.10