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> the trivial extension of the IPv4 protocol

It wouldn't be trivial in practice. You'd still end up needing to replace everything in between. And if you're going to replace everything in between, you might as well upgrade it to something much larger instead of taking little half steps that will need to be repeated again and again.

> preserving the existing IPv4 addresses

But it wouldn't really in the end. 0.0.1.2.3.4 is still a different address than 1.2.3.4. You'd still end up needing to translate 0.0.1.2.3.4 to 1.2.3.4, aka a 6to4 tunnel. So, you're in the same place in the end as where we are with the current IPv6, just with only a baby step in changes that will probably need to be upgraded again in the future.




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