iRule needed :Inside to outside DNS not getting resolved

Hi Team, My internal clients are unable to resolve the DNS when they are accessing google.com or Internet.

But from outside to inside it is getting resolved. We have created iRule with wildcard virtual server and it is getting resolved for outside to inside.

We are facing issue from inside to outside.

We have created iRule for inside to outside but not working. Can anyone suggest the the iRule as below iRule is not working.

Note: X.X.X.X IP used to resolve or forward outgoing DNS request.

**when DNS_REQUEST { if {[IP::addr [IP::client_addr] equals X.X.X.X]}

{ log local0. "-------[IP::client_addr] allowed-----" pool pool_dns }}**