F5 LTM SNAT features Question

AhmedMS to add to what Stefan_Klotz has stated because that is all correct. AutoMap does enable SNAT but it uses the self-IP of the interface closest to the pool member that you are balancing traffic to. By closest I mean whichever route on the F5 will get you to the destination pool member then that is the interface self-IP that the F5 will use to SNAT traffic. A word of caution, the self-IP of the F5 is used for health monitors and various other tasks so using AutoMap in a high connection environment might put you in a situation where you exaust the ephemeral ports on the self-IP of the F5 which can cause issues with health monitors to pool members and other communication. It is always recommended to use the SNAT pool feature over AutoMap for this reason unless AutoMap is the only configuration that will work for your situation. Typically when you configure a SNAT pool the IP in that pool will be the same IP as the virtual server (VS) that you are configuring SNAT for and in some cases of a high connection virtual server you will want to configure a range IPs so that you do not encounter port exaustion on the SNAT IP.