IPv6-Only-to-IPv4-Only Transition Mechanisms
The previous sections presented mechanisms to tunnel IPv6 packets over existing IPv4 networks to interconnect IPv6 domains. This section presents other transition scenarios in which networks made of native IPv6-only and IPv4-only protocols have to interact and coexist.
Early adopters of IPv6 are currently deploying an IPv6-only infrastructure on their production networks. In Asia and Europe, where getting globally unique IPv4 space is a long and costly process (it's almost impossible in some countries), the deployment of IPv6-only networks has already started. This enables more islands and networks made of IPv6-only nodes interconnected to the IPv6 Internet. On the other hand, organizations and providers ...
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