the best way to do this is with a switch probe or packet sniffer.
these can be highly effective but do have limitations: on a decent sized network you can run into bandwidth issues and other performance issues as the network may be able to generate more information than the device can receive (the connected switch port is slower than the total amount of traffic).
the better ones, of course, are expensive but a pretty good one you can get is from Ethereal (
www.ethereal.com)
I am curious, what kind of data are you trying to capture from this controller?