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You've basically invented 6to4. This isn't a new idea; v6 already has it.

I didn't claim it to be a new idea - I asked why we didn't do something simple like that (as the solution) instead of all the expensive complexity of trying to upgrade the entire Internet to IP6 over multiple decades.

That was my point: we did. It turns out people prefer to deploy v6 natively.

(Also, I don't think it's fair to call it simple. Many of the things we've done to deploy v6 are things which need to be done to deploy any IP protocol with bigger addresses than v4. If you count those things against v6 while ignoring them for any alternative, you aren't doing a fair comparison.)

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