wfIpv6IfTunnelProtocol 1.3.6.1.4.1.18.3.5.3.16.1.1.2.1.26

If wfIpv6IfCircuit is zero, this parameter specifies the tunnel protocol type: ip4st - IPv6-in-IPv4 static tunnel, ip6st - IPv6-in-Ipv6 static tunnel, ip4au - IPv6-in-IPv4 automatic tunnel, ip6au - IPv6-in-Ipv6 automatic tunnel, ip4sa - IPv6-in-Ipv4 semiautomatic tunnel, ip6sa - IPv6-in-Ipv6 semiautomatic tunnel. Static tunnels are tunnels where both local and remote endpoints must be defined. They are also called configured tunnels. Automatic tunnels are tunnels that don't have predefined remote address, i.e. the destination address of encapsulating header is derived from the destination address of encapsulated packet. They also called opened-end tunnels. A semiautomatic tunnel acts as a static tunnel for outgoing traffic and as an automatic (multipoint-to-point) tunnel for incoming traffic. Both local and remote endpoints must be configured.