Forum Discussion

David_L_'s avatar
David_L_
Icon for Nimbostratus rankNimbostratus
Mar 29, 2017

BigIP GTM/DNS - no listener?

I recently ran an ihealth report on one of our BigIP GTM servers in preparation for an upgrade from V11.x to 13. One of the warnings received was that "The BIG-IP GTM configuration is missing a listener object". I checked and indeed there are no listeners defined. That being said, the system is working correctly - and has been for a couple of years. The GTM (and its identical twin at another DC) is authoritative for several of our zones. It serves a mix of static IPs configured through ZoneRunner and WideIPs. There are no other (non-F5) DNS servers in the mix.

 

I've read through (many) articles and documentation on configuring listeners and just can't see what I'm missing.

 

Do I, in fact, need to add a listener to this device which is currently behaving as expected? If so, what is its purpose?

 

Thanks

 

application delivery
BIG-IP DNS
cloud
dns
gtm
listener
  • Mohammed_M_Irfa's avatar
    Mohammed_M_Irfa
    Icon for Nimbostratus rankNimbostratus
    Aug 07, 2018

    Hello,

     

    Can you please share the file location or path and file name?

     

    options { listen-on port 53 { 127.0.0.1; "zrd-acl-000-000"; }; listen-on-v6 port 53 { ::1; };

     

  • Mohammed_M_Irf1's avatar
    Mohammed_M_Irf1
    Icon for Nimbostratus rankNimbostratus
    Aug 07, 2018

    Hello,

     

    Can you please share the file location or path and file name?

     

    options { listen-on port 53 { 127.0.0.1; "zrd-acl-000-000"; }; listen-on-v6 port 53 { ::1; };

     

  • Stanislas_Piro2's avatar
    Stanislas_Piro2
    Icon for Cumulonimbus rankCumulonimbus
    Mar 29, 2017

    May be the Bind server is responding to any DNS request instead of GTM.

    to make it work, the Bind option 

    listen-on port 53 { 127.0.0.1; };
    may have been changed.

    GTM, like all others BigIP products requires a "listener" object to handle traffic.

    This listener object is a Virtual server with specific properties.

    A GTM listener create a Virtual server listening on port 53 (tcp or udp) with a dns profile.