Monitor Network Traffic with EtherApe

I wanted to count packets coming back and forth while telnet'ing to test out some different email protocols on our mail server and found this nifty little utility: it's called EtherApe. Supposedly it's a clone of Etherman, which, if it has clones, probably costs money.

(">sudo apt-get install etherape

There will be a few libraries that are dependencies, but I forget which they are.