nanog mailing list archives

Re: Waste will kill ipv6 too


From: "Ricky Beam" <jfbeam () gmail com>
Date: Thu, 28 Dec 2017 21:54:46 -0500

On Thu, 28 Dec 2017 21:05:33 -0500, Owen DeLong <owen () delong com> wrote:
If you want to make that argument, that we shouldn’t have SLAAC and we should use /96 prefixes, that wouldn’t double the space, it would multiply it by roughly 4 billion.

I'm saying I should be able to use whatever size LAN I want.

The routing problem might be real if everyone goes to PI, but I think that’s an unlikely scenario.

Every scenario everyone has come up with is "unlikely". Home networks with multiple LANs??? Never going to happen; people don't know how to set them up, and there's little technical need for it.

Your definition of “amazingly fast is pretty odd... we’ve allocated tiny fractions of 2 /3 prefixes to special uses (multicast, ULA, loopback, unknown, etc.). Beyond that, there’s a /3 delegated to IANA as unicast space for distribution to the RIRs. Of that /3, IANA has delegated a little more than 5 /12s to RIRs. That’s the total of 20 years worth of turkey carving and constitutes well under 1/8th of the address space. Issued. By that measure, we’ve got well over 160 years to worry about runout.

After 20 years of not using IPv6, that's actually A LOT of carving. And if you look at what's been assigned vs. what's being announced vs. what's actually being used, there's a fantastic amount of waste. But nobody cares because there's plenty of space, and "we'll never use it all." (history says otherwise.)


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