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hc_andy_35682's avatar
hc_andy_35682
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Feb 15, 2012

F5 GTM - DNS timeouts after several nslookups

Hi All,     We are using the F5 GTM to be the authoratative dns for our sub-domain abc.xyz.com.     We've configured zonerunner with the relevant zone details and A records to serve dns re...
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venezuz_133353's avatar
venezuz_133353
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Sep 10, 2013

I have the same issue. I use 2 listener (2 ISP) to have a HA on my FQDN. When i do a nslookup on a FQDN using this LoadBalancing method (listeners) I have a timeout of 2 sec and after the fqdn is resolved with the IP. When i publish a FQDN directly pointing on the Virtual Server public IP I don't have the timeout and the FQDN is directly resolved.

 

My listeners are configured with UDP protocol. My Wide IP has a TTL of 30 I set a custom profile of protocol UDP with an iddle timeout of 5 seconds and Datagram LB check.

 

I deduce that the problem is on the configuration of the HA mecanism of DNS on the BigIP. I don't know how can I resolve this issue...