Configuring IPv6 Tunnel Interfaces
This section describes how to tunnel IPv4 packets through IPv6 networks and IPv6 packets through IPv4 networks. For instance, in order to pass IPv6 packets through the IPv4 network, the IPv6 packet will be encapsulated into an IPv4 packet at the ingress side of a tunnel. When the encapsulated packet arrives at the egress of the tunnel, the IPv4 packet will be de-capsulated.
Tunnels can be either automatic or manually configured. A configured tunnel determines the endpoint addresses by configuration information on the encapsulating node. An automatic tunnel determines the IPv4 endpoints from the address of the embedded IPv6 datagram. IPv4 multicast tunneling determines the endpoints through Neighbor Discovery.
The following diagram depicts an IPv6 to IPv4 tunnel.
IPv6 to IPv4 Tunnel Configuration
The following sections describe IPv6 Tunnel Interface configuration: