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Forum Discussion

amritkp789's avatar
amritkp789
Icon for Nimbostratus rankNimbostratus
Oct 13, 2017

port based DNS response from GTM

Is it possible for GTM to respond to the DNS queries based on the port that I am trying to access? Elaboration: A FQDN abc.example.com has got two services running one on port X and the other on port...
application delivery
BIG-IP DNS
dns
iRules
Kevin_Davies's avatar
Kevin_Davies
Icon for Nacreous rankNacreous
Oct 13, 2017

The short answer to your question is no.

 

GTM operates at layer 3. The client makes a DNS request to lookup the IP address of the service. This is where GTM is used. The client has not even tried to connect to any service yet as that happens AFTER the IP address lookup is complete which means GTM is no longer involved as the client now talks to LTM.