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Re: draft-bourbaki-6man-classless-ipv6-00

Tim Chown <Tim.Chown@jisc.ac.uk> Fri, 09 June 2017 12:45 UTC

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From: Tim Chown <Tim.Chown@jisc.ac.uk>
To: Fernando Gont <fgont@si6networks.com>
CC: 6man WG <ipv6@ietf.org>
Subject: Re: draft-bourbaki-6man-classless-ipv6-00
Thread-Topic: draft-bourbaki-6man-classless-ipv6-00
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Date: Fri, 09 Jun 2017 12:45:39 +0000
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References: <20170602141112.x64nleqclygz7dwd@Vurt.local> <20170602141259.GD30896@gir.theapt.org> <CAKD1Yr0DtQYvCYLQexhXe_nhb5rjeyhnB4bCveqyO5Xbuwdg1A@mail.gmail.com> <CAKFn1SEdjhsQ3tKPZdbdfF4ArDzw-FZfjQT68gV55Fc-5vzBvw@mail.gmail.com> <CAKD1Yr3ppM0UF8HoN8PgS7F0iEmK26ebiuJK=tkAdZnuLWpkZg@mail.gmail.com> <CAKFn1SHASt34ihJmGN0iRFQQzLTMspZfxXHgBjBatXXcRYF4cw@mail.gmail.com> <20170604093119.nt733rb3ymmjssww@Vurt.local> <m1dHTLx-0000DcC@stereo.hq.phicoh.net> <CAKD1Yr0ZZwRar6D-2bkXBKPYehqqW99+BMtDOjyovR8WDXKzxw@mail.gmail.com> <CAD6AjGTjikAWutcenW8qn7OW8kPM9c_x_yDUy5vQxJmXKL85dg@mail.gmail.com> <91c3c0f4-eb8b-cdf7-b9c9-7d1eecb7fe64@gmail.com> <CAKD1Yr0_WR_TB+OC0U1Qt2h6WzUp9EGvrqC1ZKW2mwFeBd3bCQ@mail.gmail.com> <4021a559-5b6d-b3fb-19cd-afbe9041e8f2@gmail.com> <34A29D4D-3670-40BC-B62E-85C4EABC55D5@employees.org> <6e03e25e-fd6a-6311-390e-4834281a76f7@si6networks.com>
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> On 9 Jun 2017, at 13:24, Fernando Gont <fgont@si6networks.com> wrote:
> 
> At the time of this writing, we should probably be in the camp of "If
> you do slaac, better stick to 64, since it's know to work with legacy
> implementations, and besides, allows for sparse allocation (reduced
> collisions of IIDs when you pick a random one, resistance to address
> scans, etc.).
> 
> There's no compelling technical argument for mandating /64 (i.e., such
> specific value) if you do manual configuration or, for instance,
> stateful DHCPv6. And the recommendation for /64 for slaac mostly has to
> do with backwards compatibility than with anything else.

I think the term “manual configuration” for non-SLAAC cases is a little misleading. Many deployments, be they server deployments, or point-to-point link configurations, are likely to be increasingly automatically provisioned in some way; then there is no “manual” configuration per se. 

Tim

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