Yes, the UD-7400PD supports Ethernet MAC address Pass Through when used with Windows host computers that have this feature enabled.

To expand further, Ethernet MAC address pass-through is a function in which an Ethernet MAC address (also known as a ‘hardware’ address) programmed into the host computer is ‘passed through’ the docking station, overriding the Ethernet MAC address programmed into the docking station itself.

Please note, that the host computer must both support this feature and have it enabled in order for the mechanism to function properly.  

As an example, please see this Dell Knowledge Base article for more information → LINK