Brocade Virtual ADX Global Server Load Balancing Guide (Supporting ADX v03.1.00) - Manual (Page 83)

Brocade Virtual ADX Global Server Load Balancing Guide 73
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Transparent DNS query intercept
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queries. This parameter also instructs the Brocade Virtual ADX to ignore ARP requests and pings to
the address. The Brocade Virtual ADX needs to ignore ARPs and pings to the address because the
address still belongs to the authoritative DNS server. Without the intercept parameter, the Brocade
Virtual ADX will respond to ARPs and pings to the virtual server’s IP address.
Syntax: [no] bind dns real-server-name dns
This command binds the real server (the alternative DNS server) to the virtual server (the
intercepted authoritative DNS server). This command creates an entry in the Brocade Virtual ADX’s
port binding table that allows the Brocade Virtual ADX to redirect DNS traffic sent to the
authoritative DNS server to the alternative DNS server.
Syntax: [no] gslb dns zone-name name
This command specifies the zone for which you want to intercept queries. The Brocade Virtual ADX
will intercept and redirect DNS queries only for the zones you specify, and forwards all other client
queries to the authoritative DNS server.
Syntax: [no] host-info host-name host-application | tcp/udp-portnum
This command specifies the host application on the zone you specified above.
Redirecting queries and perform GSLB
To configure transparent DNS query intercept to redirect queries to a proxy DNS server and perform
GSLB on the response, do the following:
• Configure a real server with the IP address of the proxy DNS server
• Configure a virtual server with the IP address of the authoritative DNS server, which you want
to intercept.
• Specify the domain and host application for which you want to intercept queries.
• Enable port dns proxy on the real server corresponding to the proxy server.
NOTE
A Brocade Virtual ADX intercepts queries only for domain names configured on the Brocade Virtual
ADX. For domain names that are not configured on a Brocade Virtual ADX, the Brocade Virtual ADX
still sends queries to the authoritative DNS server.
To configure the Brocade Virtual ADX to redirect queries to another DNS server and apply GSLB on
the response, enter commands such as the following.
Virtual ADX(config)#server remote-name dns-redirect 10.200.22.100
Virtual ADX(config-rs-dns-redirect)#port dns proxy
Virtual ADX(config-rs-dns-redirect)#exit
Virtual ADX(config)#server virtual-name-or-ip dns-intercept 10.157.23.130
intercept
Virtual ADX(config-vs-dns-intercept)#port dns
Virtual ADX(config-vs-dns-intercept)#bind dns dns-redirect dns
Virtual ADX(config-vs-dns-intercept)#exit
Virtual ADX(config)#gslb dns zone brocade.com
Virtual ADX(config-gslb-dns-brocade.com)#host-info www http
Virtual ADX(config-gslb-dns-brocade.com)#exit