Microsoft has released a free security utility tool called Promqry 1.0 designed to detect the unauthorized presence of sniffers on a network. The utility, which can be operated through a graphical user interface or via command line, works by looking for network devices that are operating in promiscuous mode. It requires Windows 2000 or later and the Microsoft .NET framework. (255KB)
http://www.microsoft.com/downloads/details.aspx?FamilyID=1a10d27a-4aa5-4e96-9645-aa121053e083&DisplayLang=en
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