How To: Spy on Your "Buddy's" Network Traffic: An Intro to Wireshark and the OSI Model
Wouldn't it be nice to just sit at your buddy's house, plug into his network, and see exactly what he's doing? What if it was as easy as that? What makes packet sniffers like Wireshark such potent tools is that a majority of local area networks (LANs) are based on the shared Ethernet notion.