1 Transparent DNS query intercept
ServerIronADX(config)# server
The commands are the same as the ones for configuring the ServerIron ADX to redirect queries directly to another DNS server, with one difference. The command that enables the DNS port on the real server (the other ServerIron ADX) uses the proxy parameter. This parameter indicates that the ServerIron ADX needs to perform GSLB on the response before sending the response back to the client.
Responding to queries directly
To configure transparent DNS query intercept to directly respond to queries using IP addresses configured on the ServerIron ADX, do the following:
•Configure a virtual server with the IP address of the authoritative DNS server that you want to intercept.
•Specify the domain name and host application for which you want to intercept queries.
•Enable the DNS transparent intercept feature.
•Configure an IP policy to examine incoming DNS packets.
•Enable dns
NOTE
In the
NOTE
The ServerIron ADX intercepts queries only for domain names configured on the ServerIron ADX. For domain names that are not configured on the ServerIron ADX, the ServerIron ADX still sends queries to the authoritative DNS server.
To configure the ServerIron ADX to respond to queries using a set of IP addresses configured on the ServerIron ADX itself, enter commands such as the following:
ServerIronADX(config)# server
ServerIronADX(config)# gslb policy
These commands configure a virtual server for the authoritative DNS server IP address, specify the zone and host names for which to intercept queries, and specify the IP addresses to use in responses to the queries. The commands also enable the DNS transparent intercept feature and enable the ServerIron ADX to examine incoming DNS packets.
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