Re: Last Call: <draft-ietf-6man-rfc4291bis-07.txt> (IP Version 6 Addressing Architecture) to Internet Standard

Christopher Morrow <christopher.morrow@gmail.com> Wed, 22 February 2017 04:44 UTC

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From: Christopher Morrow <christopher.morrow@gmail.com>
Date: Tue, 21 Feb 2017 23:44:18 -0500
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Subject: Re: Last Call: <draft-ietf-6man-rfc4291bis-07.txt> (IP Version 6 Addressing Architecture) to Internet Standard
To: Lorenzo Colitti <lorenzo@google.com>
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Cc: 6man WG <ipv6@ietf.org>, 6man-chairs@ietf.org, draft-ietf-6man-rfc4291bis@ietf.org, IETF-Discussion Discussion <ietf@ietf.org>, Job Snijders <job@ntt.net>
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On Tue, Feb 21, 2017 at 10:51 PM, Lorenzo Colitti <lorenzo@google.com>
wrote:

> On Wed, Feb 22, 2017 at 12:12 PM, Christopher Morrow <
> christopher.morrow@gmail.com> wrote:
>
>> But the configuration cost and management overhead is not proportional to
>>> the hosts that are served by those interconnections, it is proportional to
>>> the number of interconnections. A 10x100G peering interconnection that
>>> serves X million hosts is one interface that has to be managed.
>>>
>>
>> isn't the dicsussion here really:
>>   "If you want to use /64 go ahead, if you want to use /121 go for it, if
>> you want to use SLAAC you'll get a /64 and like it"
>>
>
> Not sure. I for one wouldn't agree with that position, because I don't see
> that /121 has enough advantages over /127 and /64 - and few enough
> downsides for general-purpose hosts - to make it a good idea in general.
>

I don't think /121 is anymore special than /127... or /64. My point was we
don't care what prefix people use, generally, that there are cases where a
/64 is required and that's fine, there are cases where /64 isn't and people
can do what they want there.  It's simple enough to do SLAAC/64 on lans and
other places.

Requiring /64 or /127 and nothing else means when you do have to do a /120
or something else you MAY end up fighting vendor problems because they made
assumptions about: "only ever 64 or 127".