SNAT by Destination IP

So, assuming you don't apply the SNAT to the Virtual Server and want to do it all with an iRule, something like this will work if the TESTLAN destination is a single subnet;

when CLIENT_CONNECTED {
 Check if the client source IP is from the internal network
 if { [IP::addr [IP::client_addr] equals 192.168.10/16] } {
  If so, check if the destination IP is in the TESTLAN
  if { [IP::addr [IP::local_addr] equals x.x.x.x/xx] } {
   If so, don't SNAT
   snat none }
   If not, SNAT
  else {
   snat 'name or snat here or specific address'
   }
 }
}