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Re: [**EXTERNAL**] Re: the race to the bottom problem

Brian E Carpenter <brian.e.carpenter@gmail.com> Fri, 06 November 2020 20:09 UTC

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Subject: Re: [**EXTERNAL**] Re: the race to the bottom problem
To: "Mudric, Dusan" <dmudric=40ciena.com@dmarc.ietf.org>
Cc: 6man WG <ipv6@ietf.org>, "draft-mishra-6man-variable-slaac@ietf.org" <draft-mishra-6man-variable-slaac@ietf.org>
References: <160409741426.1448.16934303750885888002@ietfa.amsl.com> <3c1c3ab5-5726-b141-e7ed-618984bbbdb1@gmail.com> <CABNhwV1zoZpZNjb54rEys4+49H3vpebZW2g9JbO1_58eR+WnQg@mail.gmail.com> <CABNhwV3L7kz=cWu8s3X=djVf4MCwewzbEgx09TWaKzCULCjYUQ@mail.gmail.com> <9A9CE8E7-3552-4FD8-A50E-1BDCA2CB813F@employees.org> <CABNhwV0LxM7EuKo2wNtVacjewsVqdhrmSiVBmB_EL-mqJYdU3A@mail.gmail.com> <CD9F9F09-2CBC-4A72-99C0-4A9A470357ED@employees.org> <9e787ed0-a221-e413-e030-ac2553dffc8e@gmail.com> <a21c9447-730b-e2c0-81f6-46deda57f507@gmail.com> <f4635fa9-45ca-f7ec-40a2-41764e1ca74f@si6networks.com> <905bcc26-a223-53d0-6675-c35579b9a8be@gmail.com> <AAE75F7F-F8DF-4B7F-9C50-3D6C91544997@ciena.com>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Message-ID: <2b59b2de-3597-8d35-374d-75e9b10d4d83@gmail.com>
Date: Sat, 07 Nov 2020 09:09:14 +1300
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On 07-Nov-20 03:30, Mudric, Dusan wrote:
> Would it help if the problem statemen clarifies that:
> 
> - There is no race to the bottom. We are not trying to solve ISP problem by allowing longer than 64bit prefixes,

Unfortunately, once you push code allowing >64 subnet prefixes for SLAAC into the wild, you do automatically give ISPs a path to to allocating longer prefixes to customers, and all history tells us that some of them will follow that path.

Once that code is out there, the race to the bottom is enabled.

Even draft-bourbaki-6man-classless-ipv6 doesn't recommend changing the /64 default for SLAAC. (If it did, my name would not be on that draft.)

   Brian

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