OID value: 1.3.6.1.2.1.2.2.1.6
OID description:
ifPhysAddress OBJECT-TYPE SYNTAX PhysAddress ACCESS read-only STATUS mandatory DESCRIPTION "The interface's address at the protocol layer immediately `below' the network layer in the protocol stack. For interfaces which do not have such an address (e.g., a serial line), this object should contain an octet string of zero length." ::= { ifEntry 6 }
See also the OID Repository website reference for 1.3.6.1.2.1.2.2.1.6