I want to keep my MacBook from going online. I know how to disable wifi.
Can I prevent my MacBook from connecting to the internet if a LAN cable is plugged into it?
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To change these preferences on your Mac, choose Apple menu > System Preferences, click Network , then select an Ethernet service in the list on the left.
If there’s a lock at the bottom left of the Network pane, click it to unlock the preference pane. Source