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

Fred Baker <fredbaker.ietf@gmail.com> Mon, 12 June 2017 20:17 UTC

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Subject: Re: draft-bourbaki-6man-classless-ipv6-00
From: Fred Baker <fredbaker.ietf@gmail.com>
In-Reply-To: <CAJE_bqdRrTZoA1cS_xi6oujPyJFBW+ydgdLWjWac4g+yqe6FEw@mail.gmail.com>
Date: Mon, 12 Jun 2017 13:17:42 -0700
Cc: David Farmer <farmer@umn.edu>, 6man WG <ipv6@ietf.org>
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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> <CAKD1Yr1wmY3O9Uxe=KRxzCidpyhn3e0zSnikY0K6LK9ue4OzwA@mail.gmail.com> <71c7286c-0e86-5dbe-f9c2-7d473d1de728@gmail.com> <CAKD1Yr3SUOPd+5H66WPc2ikxauVWVG2ZBjFTHoFOQPCEYTBdiA@mail.gmail.com> <4B891D4C-96E7-42F4-9A38-EBA7B3466BE0@employees.org> <CAN-Dau38xD0oZ-0xe3K=VYgwAU25z6ySp7BgMj8HQ2iG96AoRA@mail.gmail.com> <DD7E7E11-7561-466E-91A1-787B72230B3D@gmail.com> <CAJE_bqdRrTZoA1cS_xi6oujPyJFBW+ydgdLWjWac4g+yqe6FEw@mail.gmail.com>
To: 神明達哉 <jinmei@wide.ad.jp>
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> On Jun 12, 2017, at 10:53 AM, 神明達哉 <jinmei@wide.ad.jp> wrote:
> 
> The IID length would still be defined by the
> link-type specification, and since that should be consistent with the
> addressing architecture, it *must* be 64 bits in practice.

There I disagree, and if I were making a proposal, and if the link layer address were to be relevant to it, my proposal would be that the IID be the link layer address. In an 802.3 or 802.11 network, that is a 48 bit value, in an 802.15.4 network it is 64 bits, and I imagine there are other networks with still other link layer address formats. The only reason to specify a universal IID length is for a universal algorithm that has a specific requirement. The only one I know of is SLAAC.

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