I use MAC addresses to assign static IPs on my network and have recently added a new MacBook Pro Retina with Thunderbolt adapters in stead of Ethernet ports. On the box one MAC address is given for the "Ethernet" but when I plug in to the Thunderbolt ports using the Ethernet-Thunderbolt adapter, I see a different MAC address for this connection.
Which MAC address does the DCHP server see when assigning IP addresses?
I should add that the Ethernet-Thunderbolt adapter doesn't seem to work at all for me. It either incorrectly reports that no cable is connected, or self-assigns an IP address.