![]() ![]() ![]() ![]() ![]() You can either use BGP which forms adjacencies using Global Unicast Address or Static routes as we use in this example. Note that internal routing protocols such as EIGRPv6 OSPFv3 cannot be used across the 6to4 tunnels since they use Link-Local address to form adjacencies. The routers R1 and R2 runs OSPFv3 in their internal network with routers R3 and R4 respectively. In this example, router R1 and R2 are connected via Gigabit Ethernet G1/0. Refer to Implementing IPv6 Addressing and Basic Connectivity for basic understanding on IPv6. The IPv4 address embedded in the IPv6 address is used to find the other end of the automatic tunnel. In automatic 6to4 tunnels, the IPv4 infrastructure is treated as a virtual nonbroadcast multiaccess (NBMA) link routers are not configured as point-to-point. The main difference between the manual tunnels and automatic 6to4 tunnels is that the tunnel is not point-to-point but it is point-to-multipoint. 6to4 Tunneling is one of the IPv6 translation mechanism which encapsulates the IPv6 packets into IPv4 which allows remote IPv6 networks to communicate across the IPv4 infrastructure(core network or Internet). This document provides sample configuration of IPv6 6to4 tunneling in Cisco IOS routers. ![]()
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