Peter Allgeyer wrote:
> Am Freitag, den 13.01.2006, 08:32 +0100 schrieb Marko:
>> Is it possible to track in real time how much traffic is beeing used by singel NIC throu Wan,
expecialy how much upload and how much download.
>> I can see upload/dowload rate as one but no as separated informations.
> 
> Set up MRTG [1].
> 
> BR,
>    PIT
> 
> [1] http://www.ee.ethz.ch/~oetiker/webtools/mrtg/

And don't forget cacti, my personal favorite.

http://www.cacti.net/