Several protocol analyzers are on the market and you should choose the right one for your environment. There are
a few freeware utilities out there as well that will generate the same types of information but store it only for a very low amount of time and the graphical displays are a little crude. I would highly recommend anything that reports upon NetFlow data if possible in your infrastructure. Cisco products offer robust support for NetFlow technologies and many other vendors are providing NetFlow type reporting to collectors as well. For more information, check out the NetFlow product page on Cisco's web site.
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