Using Mac OS X 10.5.6 Leopard users with Internet access can share their connection via AirPort to other users that may not be able to connect. A common example is when your work computer is tethered ...

I've got an M1 MacBook Pro, and want to connect to a 2011 Mac Mini. Basically, I'm using the Mac Mini as a fancy dongle. I want access to its ethernet port, and I've got an 8 GB USB spinning platter ...

If by "ethernet is unchecked in network control panel" you mean it's unchecked in the Network Port Configuration list, go ahead and make sure it's checked. It won't show up in the Sharing pref pane as ...