Forum Discussion

Dave_W__178431's avatar
Dave_W__178431
Icon for Nimbostratus rankNimbostratus
Mar 24, 2015
Solved

GTM Wildcard Listener

I'm trying to nail down the concept of the GTM's wildcard listener. Creating a listener (non-wildcard) causes a VS to be created for the listener's IP addresss. This virtual server then becomes anoth...
application delivery
BIG-IP DNS
deployment
design
gtm
listener
  • Brad_Parker_139's avatar
    Brad_Parker_139
    Mar 24, 2015

    Network listeners in both LTM and GTM by default do not participate in ARP. For wildcard/network listeners to work and not participate in ARP, the traffic must be routing through the BigIP for the BigIP to process it. In the GTM perspective you could have your GTM setup as the default gateway for your LDNS servers so when they perform recursion you could cache responses, use iRules, and respond authoritative if you wish.

     

Brad_Parker's avatar
Brad_Parker
Icon for Cirrus rankCirrus
Mar 24, 2015

Network listeners in both LTM and GTM by default do not participate in ARP. For wildcard/network listeners to work and not participate in ARP, the traffic must be routing through the BigIP for the BigIP to process it. In the GTM perspective you could have your GTM setup as the default gateway for your LDNS servers so when they perform recursion you could cache responses, use iRules, and respond authoritative if you wish.

 

  • Dave_W__178431's avatar
    Dave_W__178431
    Icon for Nimbostratus rankNimbostratus
    Mar 24, 2015
    Brad, thanks for your reply. It seems that the wildcard listener feature has a limited use case. Could it also be used in a conserving subnet address use case? More specifically, can it be said that creating a wildcard listener can eliminate the need to create virtual servers (done by defautlt) per-listener and instead allow the GTM to use its self-IPs as listener IPs?