
Kismet: Wireless Network Detector, Sniffer, and Intrusion Detection

This cool little program will give you detailed and useful information about your wireless network and surrounding wireless networks. If I only knew about this in college!
Description from site:
Kismet is an 802.11 layer2 wireless network detector, sniffer, and intrusion detection system. Kismet will work with any wireless card which supports raw monitoring (rfmon) mode, and can sniff 802.11b, 802.11a, 802.11n, and 802.11g traffic (devices and drivers permitting).
Kismet identifies networks by passively collecting packets and detecting standard named networks, detecting (and given time, decloaking) hidden networks, and inferring the presence of non-beaconing networks via data traffic.
Check out the documentation and download here
iEntry 10th Anniversary
LinuxHaxor
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Why pacing this here its not for windows this program should be LINUX !!!!
I am pretty sure you can run it under certain windows installs.. Here is their documentation:
2b. Windows Quick Start
PLEASE read the full manual, but for the impatient, here is the BARE
MINIMUM method to get Kismet running:
* Download the Win32/Cygwin Installer created by CACE
* Run the installer
* Start Kismet
* Pick your AirPcap or Kismet Drone sources
* READ THE REST OF THIS README
KISMET WILL ONLY WORK WITH THE CACE AIRPCAP DEVICE OR REMOTE KISMET DRONES IN WINDOWS. NO OTHER CARDS ARE SUPPORTED, PERIOD. DO NOT ASK IF KISMET WILL WORK WITH THEM ON WINDOWS, IT WILL NOT. THIS LIMITATION IS CAUSED BY THE LACK OF SNIFFER-MODE CAPABLE DRIVERS ON WINDOWS.