How to View Network Traffic in macOS and OS X
Using an application of terminal command and you’re not sure if it’s stuck? Want to monitor network usage from the computers on your network? There’s a built-in program for that.
Navigate to Applications > Utilities > Terminal.
Enter the following command and press enter:
nettop
The nettop program supports a number of commands (usually executed by pressing a single button on your keyboard). Check them out!

Resetting your network settings is usually a last-resort effort when troubleshooting network issues. It completely wipes your network settings including any saved networks—proceed with caution.
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