Surprised nobody has mentioned it yet, but some of the best network engineers I know will use a combination of `tcptrace` and `xplot`. It's on the command line

Surprised nobody has mentioned it yet, but some of the best network engineers I know will use a combination of `tcptrace` and `xplot`. It's on the command line of course, but graphs can still be generated and I think it's more performant over a GUI (for large pcaps).