Re: IID length text

Alexandre Petrescu <alexandru.petrescu@gmail.com> Mon, 16 January 2017 20:27 UTC

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From: Alexandre Petrescu <alexandru.petrescu@gmail.com>
X-Google-Original-From: Alexandre Petrescu <alexandre.petrescu@gmail.com>
Subject: Re: IID length text
To: Brian E Carpenter <brian.e.carpenter@gmail.com>
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> <fcf580ec-3617-ca5f-5337-37acb6e928ba@gmail.com>
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Date: Mon, 16 Jan 2017 21:27:15 +0100
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Le 14/01/2017 à 20:49, Brian E Carpenter a écrit :
> A modest suggestion:
>
> OLD
>    For all unicast addresses, except those that start with the binary
>    value 000, Interface IDs are required to be 64 bits long.  Background
>    on the 64 bit boundary in IPv6 addresses can be found in [RFC7421].
>
> NEW
>    IPv6 routing is based on prefixes of any valid length up to 128 [BCP198].
>    For example, [RFC6164] standardises 127 bit  prefixes on point-to-point
>    links. However, consistent use of Stateless Address Autoconfiguration
>    (SLAAC)[RFC4862] requires that all interfaces on a link use the same length
>    of Interface ID. In practice, this means that to guarantee interoperability
>    of SLAAC, a fixed length of Interface ID is necessary. For all currently
>    allocated unicast addresses, except those that start with the binary
>    value 000, that length is 64 bits. Note that this value is an arbitrary
>    choice and might be changed for some future allocation of unicast address
>    space. Background on the 64 bit boundary in IPv6 addresses can be found
>    in [RFC7421].

I agree with the change suggestion.  The new text and references are 
enough motivation to clarify that that 64bit limit is an arbitrary 
choice and might change in the future.

Alex

>
> Regards
>    Brian
>
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