Re: 64share v2

Brian E Carpenter <brian.e.carpenter@gmail.com> Wed, 11 November 2020 20:21 UTC

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Subject: Re: 64share v2
To: Lorenzo Colitti <lorenzo@google.com>
Cc: Ca By <cb.list6@gmail.com>, 6man <ipv6@ietf.org>
References: <CAD6AjGR-NE_sJ_jp7nAT6OvNkcdE9qoWuGEiiVW7r9YtsQvbbw@mail.gmail.com> <43ebd660-3df6-bc9c-2ef3-bbfd72a64229@gmail.com> <CAD6AjGQRyDDhVtunyCrWDBABG576oi=5xd1Lmz5=QicOJ6YsNA@mail.gmail.com> <d591a034-b629-cf6a-8211-b9243528db79@gmail.com> <CAD6AjGQaMCS+T-6pV=c7M_DL=qCYSdqrsemE8vUYYyqm5Rv32A@mail.gmail.com> <9dd54921-372f-f029-41ec-8eb00c12158f@gmail.com> <CAKD1Yr05C_rbzigG8H3TbF3NkGg6oj7L4+LVtASdVmpdZ2Aaeg@mail.gmail.com>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Date: Thu, 12 Nov 2020 09:21:27 +1300
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On 11-Nov-20 22:31, Lorenzo Colitti wrote:
> On Wed, Nov 11, 2020 at 9:01 AM Brian E Carpenter <brian.e.carpenter@gmail.com <mailto: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.

I disagree. The reality is that 3GPP has already overridden the intention
of RFC4861 by misusing an RA/PIO as a prefix delegation mechanism. That's
a clever trick, but it is a trick, and Cameron's proposal simply extends
that trick a bit.

> 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. 

You said a bad word: "new option". We should avoid that if possible.

> 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.

Hmm. I'd like to know whether that's an experimental or theoretical observation.

   Brian