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Easy, using a tool such as tcpdump or [http://www.ethereal.com/ Ethereal for Windows].Easy, using a tool such as tcpdump or Ethereal* for Windows.* The Etherreal project was forced to change names in May 2006 due to trademark issues. It is now called [http://sourceforge.net/project/showfiles.php?group_id=255 Wireshark].