IPv6 Network - Manually Configured Tunnels
6to4 has the advantages that it’s easy to configure and there is no need to obtain IPv6 address space. However, 6to4 also has some disadvantages: whenever the IPv4 address changes, the IPv6 addresses must also change, and communication with users of regular IPv6 address space often incurs detours through remote relays in the absence of relays closer by. Also, the relay service isn’t always very reliable, and the traffic flow is generally asymmetric (that is, packets in both directions follow different paths through the network). On the other hand, the fact that the remote endpoint is known for manually configured tunnels makes it easier to reject fake packets. Last but not least, unlike 6to4 tunnels, manually configured or point to point tunnels can transport multicast packets. Apart from allowing the use of multicast applications, this also makes it possible to use regular IPv6 autoconfiguration mechanisms and routing protocols, if desired.

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