Monitor network traffic

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http://crunchbang.org – Hi guys. I don't know if this really is the right forum for this, but since #! is running on Debian the solution should be easy to apply on a Ubuntu Server. I recently bought a NAS, Netgear ReadyNAS Duo v2 to be more specific. I plan on using it mostly at home but I also wanna make it available for my friends. Therefor I wanna be able to monitor the traffic going in & out of my network. Mostly for fun, but also to see the amount of traffic I can put out.I have a sort of clear picture of what i want. I want to have a program that monitor all my network traffic, not just on the laptop t (HowTos)