Wireshark

Wireshark is a free and open-source network protocol analyzer. It is used to capture and analyze network traffic in order to troubleshoot and diagnose network issues, as well as for educational and research purposes.

Wireshark provides a graphical user interface that allows you to view and analyze network traffic in real-time or from a capture file. It can capture traffic from a variety of interfaces, including Ethernet, WiFi, and Bluetooth, and supports a wide range of network protocols.

Wireshark provides many powerful features to help you analyze network traffic, such as:

• Decoding and dissecting of various protocols, including TCP, UDP, HTTP, DNS, and many more
• Coloring rules and filters to help you quickly identify specific types of traffic
• Statistics and measurement tools to help you analyze network performance
• Ability to export data in various formats such as CSV, XML and JSON

Wireshark runs on various platforms like Windows, Linux, macOS and Unix. It can be run in command line mode as well as GUI mode.