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https://www.7key.jp/rfc/2185/rfc2185_.html#source
https://www.7key.jp/rfc/2185/rfc2185_.html#translation
Automatic tunneling may be used when both the sending and destination nodes are connected by IPv4 routing. In order for automatic tunneling to work, both nodes must be assigned IPv4-compatible IPv6 addresses. Automatic tunneling can be especially useful where either source or destination hosts (or both) do not have any adjacent IPv6- capable router. Note that by "adjacent router", this includes routers which are logically adjacent by virtue of a manually configured point-to-point tunnel (which is treated as if it is a simple point-to-point link).
With automatic tunneling, the resulting IPv4 packet is forwarded by IPv4 routers as a normal IPv4 packet, using IPv4 routes learned from routing protocols. There are therefore no special issues related to IPv4 routing in this case. There are however routing issues relating to how IPv6 routing works in a manner which is compatible with automatic tunneling, and how tunnel endpoint addresses are selected during the encapsulation process. Automatic tunneling is useful from a source host to the destination host, from a source host to a router, and from a router to the destination host. Mechanisms for automatic tunneling from a router to another router are not currently defined.
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