Network Monitor 3.2 is a protocol analyzer. It allows you to capture network traffic, view and analyze it. Version 3.2 is an update and replaces Network Monitor 3.1. Network Monitor 3.x is a complete overhaul of the previous Network Monitor 2.x version
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Read the complete post at http://blogs.technet.com/keithcombs/archive/2008/09/17/netmon-3-2-download-now-available.aspx