Package nethogs

A tool resembling top for network traffic

NetHogs is a small "net top" tool.

Instead of breaking the traffic down per protocol or per subnet, like
most such tools do, it groups bandwidth by process and does not rely
on a special kernel module to be loaded.

So if there's suddenly a lot of network traffic, you can fire up
NetHogs and immediately see which PID is causing this, and if it's
some kind of spinning process, kill it.

System Administration
Command Description
nethogs Net top tool grouping bandwidth per process