The type of the mapping. The 'dynamic(2)' type
indicates that the IPv6 address to physical
addresses mapping has been dynamically
resolved using the IPv6 Neighbor Discovery
protocol. The static(3)' types indicates that
the mapping has been statically configured.
The local(4) indicates that the mapping is
provided for an entity's own interface address.
This object is obsoleted by IP-MIB::ipNetToPhysicalType.