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

Forum Discussion

jjm1971's avatar
jjm1971
Icon for Altocumulus rankAltocumulus
Apr 09, 2020

Enable External DNS Resolution on BIG-IP DNS

I have set up DNS Express on a BIGIP DNS, zone transfers and internal DNS resolution using the BIGIP works as expected. I also need to provide DNS resolution for external urls using the BIGIP, so I h...
application delivery
BIG-IP DNS
Samir's avatar
Samir
Icon for MVP rankMVP
Apr 11, 2020

You need to allow rule in firewall port 53 tcp n UDP. There is no other way...

​

Thanks​

jjm1971's avatar
jjm1971
Icon for Altocumulus rankAltocumulus
Apr 13, 2020

Hi Samir, it's not a firewall issue. The correct firewall rules are in place however they only allow access to a restricted list of external DNS servers. The question I have posted is around whether I have implemented the correct solution on the BIGIP DNS to provide external DNS resolution.

 

John