Pv6 over IPv4 Tunnels

In this deployment model, pockets of IPv6-only networks are connected using IPv4 tunnels. With tunneling, IPv6 traffic is encapsulated within IPv4 packets so that they are sent over the IPv4 WAN. The advantage of this method is that you do not need separate circuits to connect the IPv6 networks. A disadvantage of this method is the increased protocol overhead of the encapsulated IPv6 headers. Tunnels are created manually, semiautomatedly, or automatically using 6to4.

RFC 3056 specifies the 6to4 method for transition by assigning an interim unique IPv6 prefix. 2002::/16 is the assigned range for 6to4. Each 6to4 site uses a /48 prefix that is concatenated with 2002.

Figure 8-7 shows a network using IPv4 tunnels. Site A and Site B both have IPv4 and IPv6 networks. The IPv6 networks are connected using an IPv4 tunnel in the WAN.

Figure 8-7 IPv6 over IPv4 Tunnels

Figure 8-7 IPv6 over IPv4 Tunnels

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