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Re: [v6ops] draft-smith-v6ops-larger-ipv6-loopback-prefix-04

Fred Baker <fredbaker.ietf@gmail.com> Mon, 02 November 2020 06:35 UTC

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From: Fred Baker <fredbaker.ietf@gmail.com>
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Date: Sun, 01 Nov 2020 22:35:02 -0800
Cc: Gyan Mishra <hayabusagsm@gmail.com>, Greg Mirsky <gregimirsky@gmail.com>, Jeff Tantsura <jefftant.ietf@gmail.com>, v6ops list <v6ops@ietf.org>
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To: Mark Smith <markzzzsmith@gmail.com>
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Subject: Re: [v6ops] draft-smith-v6ops-larger-ipv6-loopback-prefix-04
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> On Oct 29, 2020, at 1:42 AM, Mark Smith <markzzzsmith@gmail.com> wrote:
> 
> I've thought that the use of Anycast would increase, and have thought that it would be useful to have a specially designated anycast prefix. It has also occurred to me that anycast has some of the properties of unicast as well as some of the properties of multicast, so could be seen to fit in between unicast and multicast (1:1 -> 1:Any -> 1:Many)

That's a reasonable description of anycast as deployed.

My question in that would be exactly what you might want to change. We have some pretty widespread use of anycast today (https://www.iana.org/domains/root/servers https://root-servers.org), and to my knowledge it seems to work just fine. If we're going to replace existing anycast with some sort of anycast prefix, the first big change we have to make is in BGP; it can advertise a unicast prefix or address, but can't, today at least, advertise an anycast prefix.Then we have to tell hosts that they can send traffic to such addresses and should. I think we should have a good reason if we're going to boil the ocean.

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