Brocade Virtual ADX Global Server Load Balancing Guide (Supporting ADX v03.1.00) - Manual (Page 142)

132 Brocade Virtual ADX Global Server Load Balancing Guide
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Basic GSLB for IPv6 configuration
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Adding a VIP for the ADNS server
The server virtual-name-or-ip command enables you to define a virtual server port on the GSLB
Brocade Virtual ADX. The virtual server acts as the authoritative DNS server (ADNS) for a domain.
Clients send queries to the virtual IP address.
The ADNS VIP intercepts DNS requests for the domains configured on it. If the query is of type
AAAA, then it performs global server load balancing in accordance with the configured GSLB policy
on all IPv6 domain IP addresses for the requested domain and places the best IPv6 address at the
top of the response. The ADNS VIP can be either an IPv4 or an IPv6 address.
To define an IPv6 intercept VIP on the GSLB Brocade Virtual ADX, enter commands such as the
following:
Virtual ADX(config)#server virtual-name-or-ip dns6-vip 2001:db8::200
Virtual ADX(config-vs-dns-proxy)#port dns
The command in this example adds a virtual server called “dns6-vip” with the IP address
2001:db8::200. The GSLB Brocade Virtual ADX processes all client queries sent to this address.
This command changes the CLI to the Virtual Server configuration level. At this level, the port dns
command adds the DNS port to the virtual server.
Syntax: [no] server virtual-name-or-ip name [ipv4-address | ipv6-address]
The name parameter specifies the name for the virtual server. The ipv4-address and ipv6-address
parameters specify the respective IPv4 or IPv6 address of the virtual server.
Enabling DNS cache proxy
The dns cache-proxy command enables you to configure the GSLB Brocade Virtual ADX to act as a
proxy for the authoritative DNS (itself a virtual server configured on the controller) so that the GSLB
Brocade Virtual ADX responds directly to the client queries.
To enable DNS cache proxy, enter the following commands:
Virtual ADX(config)#gslb policy
Virtual ADX(config-gslb-policy)#dns cache-proxy
Syntax: [no] dns cache-proxy
Enabling DNS override
DNS override enables you to configure the GSLB Brocade Virtual 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 Brocade Virtual 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
Brocade Virtual ADX to insert the proxy IP address in the DNS reply.
Virtual ADX(config)#gslb policy
Virtual ADX(config-gslb-policy)#dns override
Syntax: [no] dns override