Network Monitor (more commonly known as NetMon) is a protocol analyzer.
It allows you to capture network traffic, view and analyze it.
Supported Operating Systems:
• Windows 7; Windows Server 2003; Windows Server 2003 Itanium-based editions; Windows Server 2008; Windows Vista; Windows Vista Business 64-bit edition; Windows XP; Windows XP 64-bit
Download: Microsoft Network Monitor 3.3