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Peter_99690's avatar
Peter_99690
Icon for Nimbostratus rankNimbostratus
Sep 21, 2015

RESOLV::lookup don't work

I use RESOLV::lookup to perform a DNS query, but RESOLV::lookup don't work. It returns blank for a hostname.Why? My irules: when HTTP_REQUEST { log local0.info "www.f5.com is currently at IP [RESOLV::lookup @218.2.135.1 -a "www.f5.com"]" }

 

218.2.135.1 is a DNS server IP address.

 

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devops
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11 Replies

  • Matt_Dierick's avatar
    Matt_Dierick
    Icon for Employee rankEmployee
    Sep 21, 2015

    Hi,

     

    I suppose you forget to set a default root on the TMOS (to reach your DNS server). Management route can not be used. Set a default root in Network > Routes.

     

    Just made a test in my lab, and without any route, no DNS request.

     

    Regards Matt

     

  • Peter_99690's avatar
    Peter_99690
    Icon for Nimbostratus rankNimbostratus
    Sep 23, 2015

    Hi, I have set a default root on the TMOS (to reach my DNS server). When the management interface is down, I ping my DNS server on the command line,the DNS server is reachable.I use nslookup to resolve the domain "www.f5.com" on the command line,it is successful.But RESOLV::lookup don't work. Then I create a volume and install 12.0.0 software,then switch default boot volume to the volume. RESOLV::lookup can work on 12.0.0 software version.I don't do any other settings.Why? I think whether it is a bug of 11.6.0 software.

     

  • Aditya_248044's avatar
    Aditya_248044
    Icon for Nimbostratus rankNimbostratus
    Jun 15, 2017

    Hi, Was this issue fixed? We do see a similar issue in our environment running 11.5.3 version. Thanks

     

    • Peter_99690's avatar
      Peter_99690
      Icon for Nimbostratus rankNimbostratus
      Jun 15, 2017

      It is a bug. When I upgrade 11.6.0 version to 12.0.0 version, I fix this issue. I think you can try to upgrade your environment from 11.5.3 version to 12.0.0 version.

       

    • Aditya_248044's avatar
      Aditya_248044
      Icon for Nimbostratus rankNimbostratus
      Jun 19, 2017

      Thanks Peter for your help. I will check on this on our environment.

       

    • Aditya_Mehra's avatar
      Aditya_Mehra
      Icon for Cirrus rankCirrus
      Jun 19, 2017

      Thanks Peter for your help. I will check on this on our environment.

       

  • Aditya_Mehra's avatar
    Aditya_Mehra
    Icon for Cirrus rankCirrus
    Jun 15, 2017

    Hi, Was this issue fixed? We do see a similar issue in our environment running 11.5.3 version. Thanks

     

  • Muhammad_Asyraf's avatar
    Muhammad_Asyraf
    Icon for Nimbostratus rankNimbostratus
    Feb 17, 2018

    Hi Aditya,

     

    Are the upgrade changes made by you resolve the RESOLV::lookup as well?

     

    Thanks