Brocade Communications Systems ServerIron ADX 12.4.00 - Manual (Page 210)

198 ServerIron ADX Global Server Load Balancing Guide
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Basic GSLB for IPv6 configuration
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Enabling DNS override
DNS override enables you to configure the GSLB ServerIron ADX to "override" the DNS reply for a
domain and specify the IP addresses for the domains configured on it. DNS override (when
configured in conjunction with DNS cache-proxy) allows the GSLB ServerIron ADX to respond
directly to DNS queries using the configured IP lists, without the need for a backend DNS server.
To enable DNS override, use the dns override command. You must enable DNS override to allow
the ServerIron ADX to insert the proxy IP address in the DNS reply.
ServerIronADX(config)# gslb policy

ServerIronADX(config-gslb-policy)# dns override
Syntax: [no] dns override
NOTE
Although DNS override is a global parameter. The response to the client contains all the domain IPs
configured for the domain. You can enable the active-only option in the policy, in which case the reply
contains only the active addresses. Refer to
“Configuring an active-only policy” on page 229.
To display the DNS override state, enter the show gslb policy command. The state is shown in the
DNS override field. Refer to
“Displaying the default GSLB policy” on page 175 for more information.
NOTE
Both DNS cache-proxy and DNS override must be enabled to configure GSLB for IPv6.
Configuring zones
You must specify the DNS zone name and the host information (applications) within each zone for
which you want the GSLB ServerIron ADX to provide global server load balancing. There are no
defaults for these parameters.
To configure a zone, enter commands such as the following:
ServerIronADX(config)# gslb dns zone-name brocade.com

ServerIronADX(config-gslb-dns-brocade.com)# host-info www http

ServerIronADX(config-gslb-dns-brocade.com)# host-info ftp ftp
This example adds the zone brocade.com and two host names within that zone: www and ftp. The
GSLB ServerIron ADX will provide global SLB for these two hosts within the zone.
Syntax: [no] gslb dns zone-name
The parameter specifies the DNS zone name. If you delete a DNS zone (by entering no
gslb dns zone-name ), the zone and all the host names you associated with the zone are
deleted.
Syntax: [no] host-info |
The parameter specifies the host name. You do not need to enter the entire
(fully-qualified) host name. Enter only the host portion of the name. For example, if the fully
qualified host name is www.brocade.com, do not enter the entire name. Enter only “www”. The rest
of the name is already specified by the gslb dns zone-name command. You can enter a name up to
32 characters long.
The parameter specifies the host application for which you want the GSLB
ServerIron ADX to provide global server load balancing. You can specify one of the following: