Wireshark is free and open-source software that provides packet capture and analysis capabilities. The software is available for Mac OS X/MacOS systems. An Apple Disk Image .dmg file can be downloaded from Download Wireshark. After downloading the .dmg file, double-click on it to open it. Inside the .dmg file you will see a .pkg file and a Read me first.rtf file.
Double-click on the .pkg file to start the installation.
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