Wireshark
Wireshark is a network traffic monitoring tool.
basic usage
This is covered really well here
slightly advanced tricks
add any field as a custom column (or you can do it from prefs)
add geoip db and then go to Statistics > Endpoints and you can see the IPs plotted out on a map
decrypt tls by importing the cert
SSHdump
You can capture packets from an interface on a remote machine using SSH and tcpdump.
On Mac/Ubuntu this is built into Wireshark by default and you can select it as an option from the capture interface screen. (I think on Windows there's a plugin. Go find out and update this wiki!)
You just give it the SSH details and it runs tcpdump on the remote machine.
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