GTM iRule - answering DNS based on some criteria.

Hi guys,

Thank you both for your suggestions.

@Stephan

I just did a small tweak to get this working, as it was complaining about a missing statement:

when DNS_REQUEST {
  switch [IP::remote_addr] {   
  "10.10.100.0/24" {
    if {[LB::status vs LInk_Test_GTM] eq "up" } {     
        host 1.1.1.1
      } else {
        host 2.2.2.2
      }
   }
  "10.10.200.0/24" {
   if {[LB::status vs LInk_Test_GTM] eq "up" } {  
        host 1.1.1.1
      } else {
        host 2.2.2.2
      }
  } 
   "10.10.10.10" {
    if {[LB::status vs LInk_Test_GTM] eq "up" } {  
        host 1.1.1.1
      } else {
        host 2.2.2.2
      }
   }
 }
}

@Brad

Tried this way as well, but I get "invalid IP address" error. With the "$" sign syntax is accepted, but I am observing errors in the GTM log (this is probably valid for predefined variables within the iRule only). Data groups option is only available from DNS>Delivery>iRules>Data Group List, but I need the iRule to be created/applied on GSLB section where DGL is missing (there is only GSLB>iRules available). Unless there is a way to create them "on the fly" within the iRule...