PACKET SNIFFER : TCP DUMP

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Tcpdump is the classic IP sniffer which requires fewer system resources. It is great for tracking down network problems or monitoring activity. 

Download here:

http://www.megaupload.com/?d=IGQELRZ3

PACKET SNIFFER : WIRESHARK

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Wireshark is a fantastic open source network protocol analyzer for Unix and Windows. It allows you to examine data from a live network or from a capture file on disk. You can interactively browse the capture data, delving down into just the level of packet detail you need. Wireshark has several powerful features, including a rich display filter language and the ability to view the reconstructed stream of a TCP session. It also supports hundreds of protocols and media types.

Download from Wireshark Official Website:

http://www.wireshark.org/download.html

WIRELESS SNIFFER : KISMET

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Kismet is a console based 802.11 layer2 wireless network detector, sniffer, and intrusion detection system. It identifies networks by passively sniffing and can even decloak hidden networks if they are in use. It can automatically detect network IP blocks by sniffing TCP, UDP, ARP, and DHCP packets, log traffic in Wireshark/TCPDump compatible format, and even plot detected networks and estimated ranges on downloaded maps.  

Download here (Windows Users):

http://www.megaupload.com/?d=2RUEPA0B 

Download here (Linux Users):
 
http://www.megaupload.com/?d=ATRPIKOJ