IP Flow Monitor.This is a console utility which will listen on an interface using libpcap, aggregate the traffic into flows and display the top (as many as can fit on your screen) flows with their average throughput. A flow is identified ip protocol, source ip, source port, destination ip, destination port, and type of service flag.
Install potion in ubuntu
sudo apt-get install potion
This will complete the installation
potion [options] interface [expression]
potion -a eth0 1