argus and netflow

[Riccardo Veraldi]

Hello,
I am analyzing network traffic with argus (radium) since a few days and 
send Netflow data to the argus machine.
I wonder why  I am missing somthing in the traffic.
For example I opened a bittorrent session but I am not seeing any 
evidence of the torrent traffic.
I Should see hundred of connections or connection attempts but I can't 
see anything...
Perhaps Netflow is not the correct way to monitor such traffic ?
I mean the Netflow granularity is not enough ?
Anyway I can't see anything also for long living bittorrent sessions and 
this is weird.

any hints ?

thank you

Rick