Microsoft Network Monitor 3

Brief Description
Network Protocol Analyzer
Tool to allow capturing and protocol analysis of network traffic.

Overview
Network Monitor 3.0 is a protocol analyzer. It allows you to capture network traffic, view and analyze it. This version is a complete overhaul of the previous Network Monitor 2.x version.

System Requirements

• Supported Operating Systems: Windows Server 2003; Windows Server 2003 x64 editions; Windows Vista; Windows Vista Business 64-bit edition; Windows XP; Windows XP 64-bit
  

It is suggested that you have a CPU of 1GHz or greater, 1G or greater of Memory and 25 Megs of available Hard Disk space, plus room for capture files.

http://www.microsoft.com/downloads/details.aspx?familyid=aa8be06d-4a6a-4b69-b861-2043b665cb53&displaylang=en&tm