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Re: 64share v2

Lorenzo Colitti <lorenzo@google.com> Wed, 11 November 2020 09:31 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Wed, 11 Nov 2020 18:31:06 +0900
Message-ID: <CAKD1Yr05C_rbzigG8H3TbF3NkGg6oj7L4+LVtASdVmpdZ2Aaeg@mail.gmail.com>
Subject: Re: 64share v2
To: Brian E Carpenter <brian.e.carpenter@gmail.com>
Cc: Ca By <cb.list6@gmail.com>, 6man <ipv6@ietf.org>
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On Wed, Nov 11, 2020 at 9:01 AM Brian E Carpenter <
brian.e.carpenter@gmail.com> wrote:

>    This memo requests the 3GPP to change this requirement to allow any
>    prefix size less than or equal to 64 be advertised by the 3GPP
>    gateway RA. It also, for this purpose only, overrides the implication
>    of [RFC 4291] and [RFC 4861] that subnet prefixes in RAs are
>    always /64.
>

I think that if we want to gain consensus on this document, we should avoid
overriding/updating/touching RFC 4291.

Fortunately I don't think we need to. We can simply do as Ole suggested and
have the RA contain both the /64 PIO and a new option conveying the
delegated prefix. We need to continue to maintain the /64 PIO anyway. If we
don't, otherwise existing devices won't get IPv6 connectivity, since they
know that a PIO with a /60 isn't valid for autoconf (even if A=1), because
for global space, IIDs are always 64 bits long.

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