Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

Nikson_M's avatar
Nikson_M
Icon for Cirrus rankCirrus
May 15, 2020

GTM iRule for DNS query treatment.

Folks, We have our GTM configured with many domains. All the configured domains are a part of our subdomain "test.com".   We want to configure any domain on the GTM, say "abc.test.com". However...
application delivery
BIG-IP DNS
irules
rob_carr's avatar
rob_carr
Icon for Cirrocumulus rankCirrocumulus
May 15, 2020

If you look at the clouddocs page for DNS_REQUEST (https://clouddocs.f5.com/api/irules/DNS_REQUEST.html), there is example code for checking the source address of the query*. From there you can choose the pool to forward the resolution to.

 

*Keep in mind that the source address of the query is seldom the actual client, but is usually the client's configured DNS server.