NetHogs is a small ‘net top’ tool. Instead of breaking the traffic down per protocol or per subnet, as most tools do, it groups bandwidth by process. NetHogs does not rely on a special kernel module to be loaded. If there’s suddenly a lot of network traffic, you can fire up NetHogs and immediately see which PID is causing this. This makes it easy to identify programs that have gone wild and are suddenly taking up your bandwidth.
Being CLI it is also quick and easy to run on remote VPNs or servers via a quick SSH login.
See
Nethogs – Monitor Linux Network Traffic Usage Per Process#
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Linux #
Nethogs #
networktraffic 
This article explains how to install and find out real-time per-process network bandwidth usage with nethogs utility under Unix/Linux operating systems.
