nethogs: nethogs 0.8.0 (Bandwidth monitor)  
nethogs:  
nethogs: NetHogs is a small 'net top' tool. Instead of breaking the traffic 
nethogs: down per protocol or per subnet, like most tools do, it groups 
nethogs: bandwidth by process. NetHogs does not rely on a special kernel 
nethogs: module to be loaded. If there's suddenly a lot of network traffic, 
nethogs: you can fire up NetHogs and immediately see which PID is causing 
nethogs: this. This makes it easy to indentify programs that have gone wild 
nethogs: and are suddenly taking up your bandwidth.  
nethogs: 
nethogs:

