Use IP over Thunderbolt to connect Mac computers
Connect two Thunderbolt-equipped Mac computers using a Thunderbolt cable, then use Internet Protocol (IP) to communicate between the computers.
When you connect computers using a Thunderbolt cable, by default the computers receive IP addresses using DHCP. If needed, you can enter an IPv4 address manually.
Connect a Thunderbolt cable to the Thunderbolt ports on the computers you want to connect.
On your Mac, choose Apple menu
in the sidebar. (You may need to scroll down.)Click the Thunderbolt Bridge service, then click Details.
If you don’t see a Thunderbolt Bridge service, you need to add one. See Set up a network service.
If you need to enter an IP address, click TCP/IP, click the Configure IPv4 pop-up menu, choose an option, then enter the IPv4 address in the IP address field.
If needed, you can also enter a subnet mask and router address.
If you need to enter DNS or search domain addresses, click DNS, then enter the addresses.
Click OK.
To transfer files between the computers, open a Finder window on one Mac, click Network below Locations in the Finder sidebar, double-click the icon for the other Mac, click Connect As, select a connection option, then click Connect. If you don’t see the other Mac, make sure it has file sharing turned on.