Specifications
Configuring the Equalizer Network
Equalizer Installation and Administration Guide 15
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 of this network for the servers.
Figure 11 shows a reserved network configuration in detail.
Figure 11 Reservedinternalnetworkconfiguration
If servers placed on a non-routable network need to communicate with hosts on the Internet for any
reason (such as performing DNS resolution or sending e-mail), you need to configure Equalizer to
perform outbound NAT. When you enable outbound NAT, Equalizer translates connections
originating from the servers on the reserved network so that external hosts will not see packets
originating from non-routable addresses. If you use a failover configuration, you must use
Internet
Router
(199.146.85.1)
Equalizer
Servers
External
Network
Internal
Network
(10.0.0.0)
.10
.11
.12
External Address
(199.146.85.2)
Internal Address
(10.0.0.1)
Name
Server