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Port monitoring activity



Hi all, 

I am looking for a standard run-of-the-mill Linux command
that functions similarily to '/usr/sbin/mtr' ( A network diagnostic
tool ) except can monitor how many network packets get sent 
to or from a specific port. For example, I would want to know 
how much traffic get's sent to and from port 25 on eth0, and how 
many bytes get transferred with each packet. (A nifty way of finding
out who is sending chompy emails). 

The command can display a screen, much like mtc, which get's 
updated realtime and/or at set intervals, showing interface/port
activity levels.

I don't know if any of you guys have been hit by the 
W32.Blaster.Worm yet, but the kind of tool I am talking about will 
be very useful in finding out what ports have 'unusual' amounts 
of activity.

Jason.




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