Irule to redirect traffic to a pool with node that is out on the internet

This looks pretty good. You're sending the traffic to a pool of hosts that are external to your environment and enabling automap SNAT so that the remote host sees the self-IP of the BIG-IP. The most important aspect of this configuration is ROUTING. You must ensure that 1) the BIG-IP can route to these remote hosts, and 2) the remote host can route back based on the SNAT IP (which may or may not be required).

 

 

You may also want to consider, depending on your software version, 1) enabling OneConnect and/or 2) setting a default action in your switch statement to go back to internal pool(s).