_GetOID
status_t result = _GetOID(OID_802_3_PERMANENT_ADDRESS, buffer, 6);
status_t result = _GetOID(OID_GEN_MAXIMUM_FRAME_SIZE, &fMaxSegmentSize,
status_t result = _GetOID(OID_GEN_MEDIA_CONNECT_STATUS, &fMediaConnectState,
status_t result = _GetOID(OID_GEN_LINK_SPEED, &fDownstreamSpeed,
status_t _GetOID(uint32 oid, void* buffer, size_t length);