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Re: Updated IID length text

Lorenzo Colitti <lorenzo@google.com> Thu, 19 January 2017 04:08 UTC

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References: <148406593094.22166.2894840062954191477.idtracker@ietfa.amsl.com> <m2fukqbbwv.wl-randy@psg.com> <F6953234-3F85-4E28-9861-433ADD01A490@gmail.com> <m2wpdzhncn.wl-randy@psg.com> <82245ef2-cd34-9bd6-c04e-f262e285f983@gmail.com> <m2d1frhjfn.wl-randy@psg.com> <18e6e13c-e605-48ff-4906-2d5531624d64@gmail.com> <CAKD1Yr1cvZ8Y3+bHeML=Xwqr+YgDspZGnZi=jqQj4qe2kMc4zw@mail.gmail.com> <m2lguffnco.wl-randy@psg.com> <CAKD1Yr1TrTiPRdyutobmb_77XJ7guNzLrg=H_p7qi4BfQ8V=GA@mail.gmail.com> <m2d1frfm6m.wl-randy@psg.com> <CAKD1Yr2Njjd8_Mr+6TRFF6C5pdcX4yFgpFVyEkykDuytu2B8mg@mail.gmail.com> <2A5073777007277764473D78@PSB> <4596c3d4-a337-f08e-7909-f14270b7085f@gmail.com> <CAN-Dau06R3iYRpYLADhvHox4C9qdsJCuxFsJapRhOQcWT4qk_g@mail.gmail.com> <CAO42Z2weZcoHiBzN94QAQ9WGhWR16PmMMFNg=5YLmr_dhPjjpA@mail.gmail.com> <fcc7f136-b5da-527e-b495-5a2d7f7a3ce8@gmail.com> <55bb8bdbfbf4439da0aa702e5bc03e2c@XCH15-06-11.nw.nos.boeing.com> <CAKD1Yr2vmDkUTvSw7-GtKNeMDm1xtAppj+EW9X=-TeKZ6qkXrg@mail.gmail.com> <2889c46061ab47cfba8b54384778bd85@XCH15-06-11.nw.nos.boeing.com>
From: Lorenzo Colitti <lorenzo@google.com>
Date: Thu, 19 Jan 2017 13:07:50 +0900
Message-ID: <CAKD1Yr0JTJNJ8ApcY0zBdbKuvUAx2H57WThGr4pcVP1OLt-OMA@mail.gmail.com>
Subject: Re: Updated IID length text
To: "Manfredi, Albert E" <albert.e.manfredi@boeing.com>
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On Thu, Jan 19, 2017 at 12:24 PM, Manfredi, Albert E <
albert.e.manfredi@boeing.com> wrote:

> > The reason it can't do that is that in practice SLAAC only works well
> > if the probability of collision is negligible. Even reducing that from
> > 64 bits to 48 bits impacts that substantially.
>
> Perhaps, but SLAAC has been deemed to work adequately well with only the
> 48-bit MAC address (presumably) being unique. So nothing would change in
> this "negligible collision" regard, if we allowed for 80-bit prefixes with
> SLAAC. You'd want to do duplicate address detection regardless.
>

No, the situation with MAC addresses is different because they are intended
to be unique.

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