On Tue, May 12, 2015 at 3:40 PM, Tim Chown <tjc@ecs.soton.ac.uk> wrote:

We’re to date only allocating from 1/8th of the overall IPv6 address space.

Which is actually an immensely huge part of it.

There’s 7/8ths remaining in which policy can be changed, if required.

Yes, fortunately.

And I would put a bet on IPv6 not being the mainstream global / interplanetary communication protocol in hundreds of years, but I won’t be around to collect, so….

Perhaps it won't, but if it won't, then the IPv6 design has failed. IPv4 already has been around for 34 years or so (IIRC, we got it in 1981), and will be something we have to work with for a couple of decades or more, depending on whether IPv6 actually can replace IPv6 use that quickly. So let's say, for simplicity's sake, that IPv4's lifetime turns out to be 50-60 years.

If IPv6 shouldn't be the mainstream communication protocol for the timeframe I mentioned, someone had best get started on IPv7.

On the /64 boundary, I’d point you at RFC7421.

Well, I guess that's a nice document to point people to, if they're unfamiliar with the history of IPv6 and the issues that have been raised. I'll be sure to mention it if I run into someone who needs it, thanks!

Jan