Wireshark

Wireshark is an open source application used as a packet analyzer. It is used for network troubleshooting, analysis, software and communications protocol development, and education.

Download
Wireshark can be downloaded from http://www.wireshark.org/download.html. Choose the latest stable release for your specific operating system.

Using Wireshark
View the video tutorial on Wireshark to get up and running with this software. http://wiresharkdownloads.riverbed.com/video/wireshark/introduction-to-wireshark/

http://portforward.com/networking/wireshark.htm is another good resource.

When using Wireshark on the laptops in the CIS lab, remember to select Dell Wireless 1397 from the Network Interface Card (NIC) in the Interface drop-down menu at the top of the Wireshark Capture Options.