For more information regarding the security incident at F5, the actions we are taking to address it, and our ongoing efforts to protect our customers, click here.

Forum Discussion

Wasfi_182818's avatar
Wasfi_182818
Icon for Altostratus rankAltostratus
Sep 20, 2016

i-rule on an LTM for returning a DNS response based on the zone value in the query

Hi;   Let's say I have an LTM and a virtual server of type DNS load balancing a pool of DNS servers. Can I have an i-rule which states that if the DNS A record query is to a record in the zone abc...
application delivery
BIG-IQ
crodriguez's avatar
crodriguez
Ret. Employee
Sep 20, 2016

You are quite restricted in which DNS events and commands you can use without a GTM or DNS Services add-on license. I believe the only event you can trigger an iRule on is DNS_RESPONSE. You have access to the DNS::answer and DNS::type commands, so I suppose you could parse the answer on the DNS_RESPONSE event to see if the response includes an A record in zone in abc.net. If so, you can replace DNS::answer with the answer of your choice. See https://clouddocs.f5.com/api/irules/DNS.html for more details.