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

Forum Discussion

jjm1971's avatar
jjm1971
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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
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Apr 11, 2020

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

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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