. "Reference : RFC 2863: The Interfaces Group MIB - ifPhysAddress" . "Status : DEPRECATED" . "The interface's address at its protocol sub-layer. For\nexample, for an 802.x interface, this object normally\ncontains a Media Access Control (MAC) address. The\ninterface's media-specific modules must define the bit\nand byte ordering and the format of the value of this\nobject. For interfaces that do not have such an address\n(e.g., a serial line), this node is not present." . . .