Sam,
You would require a netflow analyser tool to analyse the results.
i have found Netflow-analyser from adventnet to be very useful. Its gives you all the details including source, destination, ports & also diplays them graphically
you can download a demo from below and try it out
http://manageengine.adventnet.com/products/netflow/download.html
Solarwinds also has an integrated network traffic monitoring tool based on cisco netflow.
You can check that out from www.solarwinds.net
HTH, rate if it does
Narayan
