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Possible Duplicate:
How can you monitor internet download usage?

Any idea how one would monitor internet usage on a laptop to find out if any unauthorised program is making internet connections?

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marked as duplicate by Scaine, Jorge Castro, James Jun 25 '12 at 13:33

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Use nethogs :)
Install it by typing sudo apt-get install nethogs.
To start the app type:
sudo nethogs [network interface name e.g. eth0, eth1 or ppp0 etc.]
To find this name use the command ifconfig and check which of the interfaces are associated with valid ip address..

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