Re: Updated IID length text

otroan@employees.org Fri, 20 January 2017 18:14 UTC

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Subject: Re: Updated IID length text
From: otroan@employees.org
In-Reply-To: <e8b4d426-55b4-bd2e-ea4f-f8e56e831d44@gmail.com>
Date: Thu, 19 Jan 2017 21:48:05 +0100
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References: <148406593094.22166.2894840062954191477.idtracker@ietfa.amsl.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> <bb79ce41f2cc465dab0a7f26466be26f@XCH15-06-11.nw.nos.boeing.com> <ed9fe2df-0dce-0ddc-bdee-561217d089bb@gmail.com> <e8b4d426-55b4-bd2e-ea4f-f8e56e831d44@gmail.com>
To: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Brian,

[...]

> NEW 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, correct use of Stateless Address Autoconfiguration
>   (SLAAC)[RFC4862] requires all interfaces on a link to use the same length
>   of Interface ID. Furthermore, to guarantee robust interoperability of SLAAC,
>   a consistent length of Interface ID is desirable. For this reason, the
>   Interface ID of all currently allocated unicast addresses, except those that
>   start with the binary value 000, is required to be 64 bits long. Background
>   on the 64 bit boundary in IPv6 addresses can be found in [RFC7421].

By changing "For all unicast addresses" to "all currently allocated unicast addresses",

Are you proposing to reverse the decision that was made back when RFC3513 updated RFC2373?
Change log:
-  Revised sections 2.4 and 2.5.6
 to simplify and clarify how
      different address types  are identified.  This was done to insure
      that implementations do not build in any knowledge about global
      unicast format prefixes.  Changes include:
         o  Removed Format Prefix (FP) terminology
         o  Revised list of address types to only include exceptions to
            global unicast and a singe entry that identifies everything
            else as Global Unicast.

Best regards,
Ole