Description: Table of port map entries indexed by the NAT instance, protocol, and external realm and address. A port map entry associates an internal upper-layer protocol endpoint with an endpoint for the same protocol in the given external realm. By definition, this is a snapshot of NAT instance state at a given moment. The table provides the basic mapping information.

In the case of DS-Lite (RFC 6333), the table provides the internal IPv6 tunnel source address in natv2PortMapInternalRealmAddress and the IPv4 source address of the encapsulated packet that is actually translated in natv2PortMapInternalMappedAddress. In the general (non-DS- Lite) case, those two objects will have the same value.