Fun, but if you have a managed switch, there are some even more interesting things you can do, like bandwidth monitoring:<p>nTop - <a href="http://www.ntop.org/news.php" rel="nofollow">http://www.ntop.org/news.php</a><p>And realtime traffic stats:<p><a href="http://iptraf.seul.org/" rel="nofollow">http://iptraf.seul.org/</a><p>If you run SIP on your network, you can capture call setup information to debug phone issues:<p><a href="http://wiki.wireshark.org/SIP" rel="nofollow">http://wiki.wireshark.org/SIP</a><p>And even extract RTP audio streams to investigate call quality issues:<p><a href="http://wiki.wireshark.org/RTP_statistics" rel="nofollow">http://wiki.wireshark.org/RTP_statistics</a>