RFC 3056:Connection of IPv6 Domains via IPv4 Cloud...
RFC-Ref

IPv6 packet


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... encapsulation mechanism for transmitting IPv6 packets using such a prefix over the global IPv4 network. It also describes scenarios for using such prefixes ...
... 6to4 encapsulation of IPv6 packets inside IPv4 packets occurs at a point that is logically equivalent to an IPv6 ...


... IPv6 packets from a 6to4 site are encapsulated in IPv4 packets ...
... IPv6 packets are transmitted in IPv4 packets [RFC791] with an IPv4 protocol ...
... RFC791] with an IPv4 protocol type of 41, the same as has been assigned [MECH] for IPv6 packets that are tunneled inside of IPv4 frames. The IPv4 header ...


... queries the DNS for a host on site B. IPv6 packets are formed and transmitted in the normal way within both sites. ...
... IPv6 packets received by the relay router whose next hop IPv6 address ...
... if the next hop IPv6 address for an IPv6 packet does match the prefix 2002::/16, and ...



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