M1 Mac Studio, OS 12.7.1
Connected to switch via 1000Base-T Ethernet – all tests show a live connection.
But if I switch off Wi-Fi, I lose both Internet and local network connectivity. Why?
Or putting it another way, why won’t the Mac use Ethernet (for a faster connection)?
Do you have Ethernet at the top of the connections list in Network settings?
Had the same issue a while ago – for some reason Ethernet had made itself Inactive when using wifi. Fix was:
System Settings > Network > Ethernet > Make Active (at bottom of list).
Thanks for the suggestions. I’ve sorted it: the DHCP source was incorrectly set. Having set it to “Manual”, I now have full-speed Ethernet.