Packet loss and huge delays on data interfaces of LTM VM on VMWare

Ilya, even if the issue is with the big-ip we need a packet capture to see where is the issue. Ping tells us nothing.

I am not sure what if it is license related but what is the speed limit in your license? What if your big-ip is dropping the packets due to license speed limit? It might be just legitimate drop of the look packets due to lack of listener.

If the issue affects all boxes in your environment this is definitely something causing this from outside

If you are not facing the issue with ver 12 why just not go with it? What does prevent you to go with 12? There are too many questions and too many unknowns. Need a capture