Kismet

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 (with appropriate hardware) can sniff 802.11b, 802.11a, 802.11g, and 802.11n traffic. Kismet also supports plugins which allow sniffing other media such as DECT.

Kismet identifies networks by passively collecting packets and detecting standard named networks, detecting (and given time, decloaking) hidden networks, and infering the presence of nonbeaconing networks via data traffic.

Kismet 是一個 802.11 layer2 的無線網路偵測、嗅探及入侵偵測系統，只要是 Linux 支援的無線網卡，幾乎都可以用。Kismet 可以 sniff 的封包有 802.11b/a/b/g/n。 

http://www.kismetwireless.net/