Understanding SNAT
SNAT pool is configured but source translation is set to None on Virtual Server and there is a pool attached to it which has Allow SNAT as yes? Does translation happens in this case when client sends a request to server? As per my understanding it shouldn’t but I’m seeing source ip from snat pool list for server side connection.
Yes, if you have such configuration as this is outside the F5 Virtual servers (VIP) configuration and it works for all traffic matching this SNAT object. The idea is if you want to use the F5 devices just as NAT/SNAT devices without load balancing, you use those objects. You read the article below on how this is done:
https://support.f5.com/csp/article/K47945399
Please also read this as if you have VIP with snat pool or auto map and NAT and SNAT separate objects the VIP SNAT config takes priority over the NAT and SNAT objects. If the VIP does not do source translation then if there are matching NAT and SNAT objects, they are used as the NAT has higher priority than the SNAT. If there is no NAT object and the VIP does not do translation, then the SNAT is used.
https://support.f5.com/csp/article/K9038