An IP traffic monitor that shows information on the IP traffic passing over your network.
3.iftop
Amazing network bandwidth utility to analyse what is really happening on your eth
http://s0.cyberciti.org/images/faq/2013/11/iftop-outputs-small.gif
4.pkstat
pktstat listens to the network and shows the bandwidth being consumed by packets of various kinds in realtime
5.EtherApe
is a graphical network monitor for Unix modeled after etherman. Featuring link layer, IP and TCP modes, it displays network activity graphically.

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