Brocade Communications Systems ServerIron ADX 12.4.00 - Manual (Page 213)

ServerIron ADX Global Server Load Balancing Guide 201
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Basic GSLB for IPv6 configuration
2
Site ServerIron ADX configuration
Enabling the GSLB protocol
The GSLB protocol is disabled by default on site ServerIron ADX switches. You must enable the
GSLB protocol on each site ServerIron ADX switch and configure the IP addresses of the site
ServerIron ADX switches on the GSLB ServerIron ADX to enable the GSLB ServerIron ADX to
establish communication with the site ServerIron ADX switches.
To enable the GSLB protocol on the site ServerIron ADXs, enter the following command:
ServerIronADX(config)#gslb protocol
Syntax: [no] gslb protocol
The ServerIron ADX uses TCP port 182 for the GSLB protocol by default. You can change the port
number if needed. Refer to
“Changing the protocol port number” on page 29.
You also can secure access to a ServerIron ADX by configuring Access Control Lists (ACLs). For
example, you can configure ACLs to control access to the device on TCP port 182. See the “Access
Control Lists (ACLs)“ chapter of the ServerIron ADX Security Guide.
Basic configuration example
The following procedure demonstrates the configuration of a GSLB ServerIron ADX for performing
IPv6 GSLB. The configuration describes to the example shown in
Figure 12 on page 195.
Configuration on GSLB ServerIron ADX (GSLB controller)
First, configure a virtual IP address to represent the authoritative DNS server (ADNS) for the
domain. Although you do not need a real DNS server when you configure the GSLB ServerIron ADX
as a DNS cache proxy with DNS override, you still need to configure a virtual IP address for the
ADNS. Clients send queries to the virtual IP address.
1. To add a virtual IP address to which the clients can send their DNS queries, enter a command
such as the following:
ServerIronADX(config)# server virtual-name-or-ip dns6-vip 2001:DB8::200

ServerIronADX(config-vs-dns-proxy)# port dns
ServerIronADX(config-vs-dns-proxy)# exit
The command adds IP address 2001:DB8::200 as a virtual server, the ADNS. When clients send
their DNS queries to this address, the GSLB controller processes the queries.
NOTE
The DNS VIP can also be IPv4 address.
2. Enable DNS cache proxy mode with DNS override mode:
ServerIronADX(config)# gslb policy

ServerIronADX(config-gslb-policy)# dns cache-proxy
ServerIronADX(config-gslb-policy)# dns override
In a DNS cache proxy with DNS override configuration, GSLB ServerIron ADX (the GSLB controller)
itself acts as the authoritative DNS server for the configured zones. The gslb policy command
changes the CLI to the GSLB policy configuration level.