Selective Source NATing

Thanks.

Ran into my first snag... I tried using the internal address of the load balancer (the gateway for the pool hosts) as the snat pool address, but got the following error when loading:

./bigip.conf: "The snatpool contains an invalid member."

Under 9.x, I'm able to use the gateway IPA in a source NAT. For 4.5 should I be using a different IPA, or is my syntax for defining the snatpool incorrect? I realize this feature is unsupported in 4.x, but I'm hoping someone has done this before and can offer some hints.

This is the exact configuration used:

snatpool internal_snat_pool {
  member 216.27.85.193
}
rule SNAT_Internal_Test {
   if (client_addr == 216.27.85.192 netmask 255.255.255.224) {
      use snatpool internal_snat_pool                         
   }
   use pool Test-Pool
}