2.2.2.2.87 Ipv6InterfaceId
The Ipv6InterfaceId key specifies a 64-bit interface identifier for the IPv6 address of the demand-dial connection. This key is optional.<234> This key SHOULD be initialized to 0000000000000000 and MUST be ignored on receipt. When RRAS connects to a remote RRAS endpoint, the interface identifier for the IPv6 address of the demand-dial connection is cached as a value for this key.