Segregate listener responses

Hi, I have a GTM running with 2 listeners (they are assigned to different physical interfaces and go to different vlans), one servicing lb-internal resolutions and the other serving lb-external. I have this iRule on the lb-external listener when DNS_REQUEST { if { ([IP::local_addr] eq "192.168.3.10") and ([DNS::name ne "lb-external "] ) } { drop } }

 

But if i dig one of the lb-internal names on the lb-external listener i get a response, where i should be getting a drop. Am i missing something obvious here? All i want to do is to segregate the lb-external interface so that it will only return its associated resolutions

 

Thanks