LTM : Troubleshooting with no source IP

Hello Mate, 

Thanks for checking. 

We crossed our first battle. like we found the IP with which it is coming to our environment. 

But we are proceeding further check using the suggestion given here. So once I get the concrete thing I will update here and we can make that available to all as a resolution. 

We were asked to prove like it's leaving our F5 or not. we can see that the traffic is handed over to the Pool from F5 level.  It is a cloud F5 so they are using AWS LB URL in pool. 

The traffic is getting Natted on the F5. so AWS LB level can't segregate the traffic from Google .If it reaches AWS LB then they will start investigate from their side  . so we thought of create  SNAT pool and associate to this Ip's which Google uses. sot that we can segregate traffic on the AWS LB. we are on it.  keep you posted.