Wireshark is a free and open source packet analyzer for Linux

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Wireshark is a free and open source packet analyzer. It is used for network troubleshooting, analysis, software and communications protocol development, and education. Wireshark uses the Qt widget toolkit in current releases to implement its user interface, and using pcap to capture packets.

Wireshark lets you put network interface controllers into promiscuous mode (if it is supported by the network interface controller), so you can see all the traffic visible on that interface, including unicast traffic, not sent to that network interface controller's MAC address.

However, when capturing with a packet analyzer in promiscuous mode on a port on a network switch, not all traffic through the switch is necessarily sent to the port where the capture is done, so capturing in promiscuous mode is not necessarily sufficient to see all network traffic.

Port mirroring or various network taps extend capture to any point on the network.

Wireshark understands the structure of different networking protocols and it can parse and display the fields, along with their meanings as specified by different networking protocols.

On Linux, with libpcap 1.0.0 or later installed, Wireshark 1.4 and later can also put wireless network interface controllers into monitor mode.

NOTE: WireShark is used during CCNA - certifications at Universitys.

Other: There is also a terminal-based (non-GUI) version called TShark, most likely used by g33ks.

License: GNU/GPL V3.

How to install:

sudo apt-get install wireshark

Press Enter,

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