According to the invention an embodiment, a network node for communicating using a MAC address is disclosed. The network node includes a point-to-point interface, a bridge and a MAC address register. The point-to-point interface uses a first protocol. The bridge is coupled to the point-to-point interface and provides a fixed route for the Ethernet interface. The first protocol encapsulates the data of a second protocol. The MAC address register stores the MAC address for the second protocol, were the MAC address is dynamically determined in the field and written to the MAC address register. The MAC address is used when communicating with the network node through the point-to-point interface.