So let's say you have setup TLS between two different services. And you want to "prove" that out (for lack of better words. Basically just trying to witness the encrypted traffic in action).
What's the best/easiest way to do that? Because those two services are communicating directly, can you really put yourself in the "middle" of the communication without doing major things (I guess modifying the routing tables of both services to send traffic through the observer?)?
I suppose one way is to go on one service and just look at network traffic with tcpdump? Is that correct? And if so, is that the easiest way?
Thanks in advance!