Summary
As we've seen over the course of the book, much of IPv6 is finalized. Certainly enough is now concrete that IPv6 could step in as a replacement for IPv4, we would lose no features, and we would also be able to gratefully dispose of NAT.
However, as you might expect of a living and growing protocol, not everything in IPv6 has been finalized yet. This is in fact good: not only does it keep us networking folk in jobs and thinking about interesting things, but it also means that we have not spent our time solving problems that do not exist yet.
In this chapter, we ran through some of the more controversial outstanding issues, illustrated our take on them, and talked a little bit about where you might expect to see IPv6 ending up in the future. Hopefully these will help you in your planning and preparation.
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