Listeners control how BIG-IP GTM handles network traffic. A listener is a specialized virtual server that is assigned a specific IP address. A wildcard listener is a special listener that is assigned an IP address of 0.0.0.0 and DNS query port (port 53). When traffic is sent to the IP address of a listener, BIG-IP GTM either handles the traffic locally or sends the traffic to the appropriate resource.
Perform these tasks to replace a DNS server with BIG-IP GTM.