[clug] Measuring Bandwidth usage by Application Protocol

[jm]

It's a little quiet on the list today. May be everyone's taking an 
extended "Community Day" or something. Anyway, I'm looking at generating 
some network usage statistics on an open network with a large number of 
users. The data I'm looking to collect is

  Source IP
  Source Port
  Destination IP
  Destination Port
  Application Protocol
  Packets
  Octets
  Duration


of each session or flow on a 15 minute basis. NetFlow is close to giving 
me with this, but lacks the application level protocol information that 
I'm after. Any thought, or suggestions on how to collect this data?

Jeff.