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hung_105573
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Oct 23, 2012

F5 response DNS loadbalance inbound time out 2s

Hi all

 

I facing problem F5 response DNS time out 2s for loadbalance inbound, when users in outside and set DNS server 8.8.8. 8 then have time 2s .

 

My network have DNS server inside ,F5 is gateway internet , i have loadbalance ibound on F5 and DNS server delegated some record to F5 .

 

the listener on F5 is seflIp of Lan internet .

 

 

pls help me

 

thanks all

 

9 Replies

  • Can you provide your software version please and also let us know what modules you are using, it's not quite clear.
  • Hi

     

    the IOS version is BIG-IP 11.1.0 Build 1943.0 Final , my F5 ( LC and LTM)

     

    thanks all

     

  • So how is the F5 hosting DNS records? Where is the 2s timeout seen? Do you mean the DNS record TTL?
  • Hi

     

    on F5 i have config wideip : www.wip.abc.com , there are 2 member is 2 vs inbound

     

    the DNS server inside delegated record www to F5 .

     

    the listener ip : seflip internal interface

     

    the users in outside nslookup and shaw ip wan correct to access web. but time out 2S

     

    C:\Users\hung>nslookup

     

    Default Server: google-public-dns-a.google.com

     

    Address: 8.8.8.8

     

    > www.abc.com

     

    Server: google-public-dns-a.google.com

     

    Address: 8.8.8.8

     

    Non-authoritative answer:

     

    DNS request timed out.

     

    timeout was 2 seconds.

     

    Name: www.wip.abc.com

     

    Address: a.b.c.d

     

    Aliases: www.abc.com

     

    pls help

     

    thanks

     

     

  • Hi

     

    the users in inside query dns work fine , is this config true ? i think query dns time out 2s will made slow process access , how to fix it ?

     

    pls help

     

    thanks

     

     

     

  • I'm not sure how you can have a wide IP configured if you're not using GTM. Regardless, I'd suggest you try a lookup using a different Internet DNS server (not Google) and see if the result is the same.
  • hi al

     

     

    My F5 ( LC,LTM) , LC have wideip loadbalance inbound . I tested in environment and the Ip dns of end users is ip of Vss DNS server inside network , when the users query some record was delegated in F5 then time out 2s any else record work fine

     

     

    pls help me

     

     

    thanks all