Tunneling IPv6 traffic in IPv4 shows a network with four nodes. Each of R1 and R2 has an interface that is configured as IPv6 and an interface that is configured as IPv4. The figure shows configuration of the nodes by using tunneling over IPv4 to enable R3 and R4 to communicate through R1 and R2.

In the figure, all interfaces are configured with the IP addresses as shown, and R1 and R2 have forwarding enabled.