The type of mapping. The 'dynamic(2)' type indicates that the IP address to physical addresses mapping has been dynamically resolved using e.g. IPv4 ARP or the IPv6 Neighbor Discovery protocol. The 'static(3)' type indicates that the mapping has been statically configured. Both of these refer to entries that provide mappings for other entities addresses. The 'local(4)' type indicates that the mapping is provided for an entity's own interface address. As the entries in this table are typically not persistent when this object is written the entity SHOULD NOT save the change to non-volatile storage.