Maintain the Src IP while SNATing to multiple pools

All,

Apologies if this is answered here already -- I looked for a while and could not find it, but please directly to that thread if appropriate.

I have BigIP LTM 9.4.4 and I need a configuration to allow pools of source IP addresses to SNAT to a common IP on the "internal" side.

So in a simplified example, servers are pooled together, and I want the target server to see a common IP address for all servers in a pool, but this IP needs to be unique across different pools.

I hope my diagram doesn't make the question more confusing. Everything is on the same as the LTM is being used in a "loopback" configuration just to translate within the same subnet. I need a common VIP (IP/port) used by all client servers in the network:

  
        
                     +- F5 LTM ----------------+     + server --+    
    Server A --\     | IP A --\                |     |          |    
    Server B ------> | IP B -----> SNAT_POOL_1 | <-> | src IP 1 |    
    Server C --/     | IP C --/                |     |          |    
                     |                         |     |          |    
    Server D ------> | IP D -----> SNAT_POOL_2 | <-> | src IP 2 |    
    Server E --/     | IP E --/                |     |          |    
                     +-------------------------+     +----------+    
    
  

I've created SNAT lists containing the client server IPs (A,B,C,D,E) and associated these with created SNAT pools containing the new source IP (1,2). When I create the VIP, I need to associate a specific SNAT_POOL, auto-map which uses the self IP, or none which passes through the client server IP. I don't see how I can get the combination.

Is it possible?

Thanks in advance for your help.

-Scott