Hi There,
I am guessing you are the same person which asked this question over on Spiceworks?
http://community.spiceworks.com/topic/532900-dpi-signature
Another point I meant to bring up is where you will get a source of network packets. In most networks you have a couple of options, local on a client or server, SPAN ports or by using promiscous mode on virtual switches.
Darragh