There are many traffic monitoring tools available on Linux, which can monitor/classify network traffic, and report real-time traffic statistics in fancy user interfaces. Most of these tools (e.g., ntopng [http://xmodulo.com/2013/10/set-web-based-network-traffic-monitoring-linux.html] , iftop [http://xmodulo.com/2012/06/how-to-install-iftop-on-linux.html]) are powered by libpcap