Packet capture is the act of capturing data packets crossing a network

Best Offline analyze tools

1.Wireshark formly ethreal

Best online packet capture analyze tools

1.Pcapr-www.pcapr.net

Best packet capture samples

1.Evilfingers security community-https://www.evilfingers.com/projects/pcaps.php
2.Wireshark-http://wiki.wireshark.org/SampleCaptures
3.Packet life-http://packetlife.net/captures/