Wireshark is a network traffic monitoring tool.
This is covered really well here
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.