Re: Review of draft-ietf-6man-rfc4291bis-06

Lorenzo Colitti <lorenzo@google.com> Fri, 13 January 2017 07:31 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Fri, 13 Jan 2017 16:31:07 +0900
Message-ID: <CAKD1Yr1TrTiPRdyutobmb_77XJ7guNzLrg=H_p7qi4BfQ8V=GA@mail.gmail.com>
Subject: Re: Review of draft-ietf-6man-rfc4291bis-06
To: Randy Bush <randy@psg.com>
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Cc: IPv6 List <ipv6@ietf.org>, IETF <ietf@ietf.org>, int-dir@ietf.org, Bob Hinden <bob.hinden@gmail.com>, draft-ietf-6man-rfc4291bis.all@ietf.org
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On Fri, Jan 13, 2017 at 4:08 PM, Randy Bush <randy@psg.com> wrote:

> > So while Randy may well be right that we will move away from classful
> > eventually
>
> that is the line i was fed 15+ years ago.  i did not accept it then and
> i see no good reason to accept it now.
>

You might in another 15 years :)


> > we certainly never had it in the top 64 bite of the address
>
> bzzt!  you may want to look at rfc 2450.
>

Oh wow. Yes, I had forgotten. But that was not just classful addressing,
that would have been a much bigger change, with business implications as
well.


> > For now, I'd much prefer to just add a similar exception to the one we
> > have in 7421.
>
> you'll need to start an iana registry.  for p2p some use /127, some
> /126, and i have seen /120 on a multipoint mesh, worked fine.
>

I'm sure they worked fine. I don't know if there will be consensus to
change the documents to say that those lengths are in spec.


> we have had to fight massively with vendors to make it classless.
> please do not give them excuses to break things.
>

On a lot of hardware /65 - /126 is not very well-supported.