This mode is normally used for packet sniffing that takes place on a router or on a computer connected to a hub (instead of a switch) or one being part of a WLAN. In computer networking, promiscuous mode or promisc mode is a mode for a wired network interface controller (NIC) or wireless network interface controller (WNIC) that causes the controller to pass all traffic it receives to the central processing unit (CPU) rather than passing only the frames that the controller is intended to receive. Wireshark can capture live data flowing through the network.

It has several advance options such as filtering the packets, exporting packets, and name resolution. Wireshark supports a wide range of protocols likeTCP, UDP, HTTP and even advanced protocols such as AppleTalk. Wireshark, and the other programs distributed with it such as TShark, are free software, released under the terms of the GNU General Public License. There is also a terminal-based (non-GUI) version called TShark. It runs on Linux, OS X, BSD, Solaris, some other Unix-like operating systems, and Microsoft Windows.

It is used for network troubleshooting, analysis, software and communications protocol development, and education.

Wireshark is a free and open-source packet analyzer that captures data packets flowing over the network (wire) and presents them in an understandable form through its GUI.

Wireshark promiscuous mode windows