Description: Realm to which the internal address belongs. In most cases, this is the realm defining the address space of the packet being translated. However, in the case of DS-Lite (RFC 6333), this realm defines the IPv6 outer header address space. It is the combination of that outer header and the inner IPv4 packet header that is remapped to the external address and realm. The corresponding IPv4 realm is restricted in scope to the tunnel, so there is no point in identifying it. The mapped IPv4 address will normally be the well-known value 192.0.0.2, or at least lie in the reserved 192.0.0.0/29 range.

If natv2AddressMapSubscriberIndex in this table is a valid subscriber index (i.e., greater than zero), then the value of natv2AddressMapInternalRealm MUST be identical to the value of natv2SubscriberRealm associated with that index.