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Netwatcher is a small menu bar utility that monitors your network and who and what is connected to your computer.

Internet Monitoring checks that you are connected to the Internet and what your public IP address is.

Interface monitoring concerns the various network interfaces on your Mac. You can check if they are still active and connected to their router and get their local IP address. You can also choose your network location.

Service Monitoring concerns File Sharing (SMB), Screen Sharing (VNC), Remote Connection (SSH and Telnet), the remote control (ARD) but also everything else you want to monitor. Indeed, it is possible to add your own services if you know the port to monitor. So in my case I'm monitoring an Rsync sync server.

This monitoring can manifest itself in many different ways, in the menu bar, by notification, by sound, all of which are very precisely customizable. You can also add this login information to a log so that you can later check who has logged into your computer.

I have designed Netwatcher to be as light as possible. For example, it consumes less than 0.1% of an M1 processor with each refresh.