Instruction manual

Chapter 2 Installation, Configuration and Management
2-18 NetScaler 9000 Series Installation and Configuration Guide - Volume 1
NSICG60_DEC04
 Public-Private
When load-balancing a server farm, it may be desirable to hide the IP
addresses of the real servers. This can be accomplished by placing the
servers on non-routable IP subnets.
Although no router or gateway is usually placed between the NetScaler
9000 system and server farm, the router or gateway can be placed there if
required .
In this environment, the servers must be configured with the NetScaler
9000 system as the default router.
Depending on whether the NetScaler 9000 system needs to perform
network address translation (NAT) the subnet with the servers should be
configured for reverse network address translation (NAT) in the
NetScaler 9000 system. For more information on configuring RNAT in
NetScaler 9000 system, see “VLANs Support in Chapter 13”.
This environment is the same as that shown in Figure 2-20 (i.e. the high
availability, two-arm mode), except the upper part is a public subnet and
the lower part consists of private subnets.
The following applies to this environment:
z Virtual IP addresses (VIPs) configured in the NetScaler 9000
system are on a public subnet.
z The two NetScaler 9000 systems, their IP addresses and the
mapped IP address are on public or private subnets.
z The servers and their IP addresses may be either in the same or
different private subnets.
This environment can be varied to yield a one-arm mode with or without
high availability.
2.3.2 Pre-Installation Checklist
Before installing the NetScaler 9000 system, use the following check list to
ensure that you have all of the hardware and software items:
2.3.2.1 Hardware
1. NetScaler 9000 system
2. Brackets to hold NetScaler 9000 system
3. RJ-45-to-RJ-45 Serial Cable