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

DNS::question name - Modifying a DNS Suffix When Your Windows Client Appends It During Recursive Lookups

Quite some time ago I was asked about a 2-second delay when performing recursive lookups against the BIG-IP. My first thought was that there was an issue with transport. I then decided to deploy it i...
Updated Jun 05, 2023
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BIG-IP DNS
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Steve_Lyons's avatar
Ret. Employee
My name is Steve Lyons and I reside in Tampa, FL with my 3 children, wife and Frenchie. We live the typical Florida life of swimming, fishing, boating, and BBQ. I started my F5 journey as a customer in 2009 where I was first introduced to it as a "load balancer." I have since deployed and maintained all modules realizing the BIG-IP is so much more. I joined F5 in 2015 where I have made it a personal mission to educate as many people as I can so they too can take advantage of the tremendous potential of the BIG-IP.
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stan_piron's avatar
stan_piron
Icon for Cumulonimbus rankCumulonimbus
Jan 04, 2019

if you don't want domain appended, you must end the request with a dot.

nslookup www.google.com

will first request with domain appended, then fallback to initial request

nslookup www.google.com.

will request only