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I do not want to use WiFi but need to share my iMac's Internet connection (with incoming Ethernet) to my MacBook Pro, using a Thunderbolt cable.
I've connected the two in Network/sharing settings, can share files/screens etc, but the MacBook Pro does not pick up any Internet connection.
I switched on Internet sharing on the iMac, Ethernet → Thunderbolt, but no joy - any ideas?
You need to enable the DHCP server service included in macOS. Do this on the side that acts like a router (sharing side).
DHCP is what gives an IP address, DNS servers to user etc. to connected devices.
