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Re: Deprecating IPv6 (Re: draft-bourbaki-6man-classless-ipv6-00)

Brian E Carpenter <brian.e.carpenter@gmail.com> Mon, 05 June 2017 04:13 UTC

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Subject: Re: Deprecating IPv6 (Re: draft-bourbaki-6man-classless-ipv6-00)
To: Lorenzo Colitti <lorenzo@google.com>
Cc: 6man <ipv6@ietf.org>, draft-bourbaki-6man-classless-ipv6@ietf.org
References: <CAO42Z2wp72j-yOsR8C=iqS+dX14wLwthAtOTvD5ugj_NQ=NQag@mail.gmail.com> <8be34ef8-557f-652e-0d2f-f1a1e008bffd@gmail.com> <CAKD1Yr0d-BVeG6ceU=F4Jd864SFj6msofeOOi8GAcPxOLsA9dA@mail.gmail.com>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
Message-ID: <e892e15f-3479-8099-0d72-41fe18ecabb8@gmail.com>
Date: Mon, 05 Jun 2017 16:13:31 +1200
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On 05/06/2017 15:38, Lorenzo Colitti wrote:
> On Sun, Jun 4, 2017 at 5:43 AM, Brian E Carpenter <
> brian.e.carpenter@gmail.com> wrote:
> 
>>> If this proposal is accepted, then I think /120s will become the
>>> defacto subnet size, despite what the draft says about /64s being the
>>> recommended default.
>>
>> Predicting the future of complex systems is hard, but I think this
>> prediction is wrong. There are some very strong arguments against
>> prefixes that long, and it is the IPv6-over-foo specs that prevent
>> such long prefixes being used.
>>
> 
> None of which the people deploying /120s will understand or even be aware
> of. Seriously: I've seen premier-grade IT departments - even in
> well-funded, very technical companies with a very high hiring bar - deploy
> NAT66 in their corporate networks without understanding that it would break
> applications.

I don't doubt it. But nothing today stops them using DHCPv6 exclusively
and deploying /120s - just too bad for any users of an o/s that doesn't
support DHCPv6, right?

I don't mean I like this. Actually I see no reason today to deploy
anything other than /64. I just want to see a correct architectural
description of what we have.

    Brian

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