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RE: I-D Action: draft-ietf-6man-default-iids-04.txt

Christian Huitema <huitema@microsoft.com> Mon, 06 July 2015 21:15 UTC

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From: Christian Huitema <huitema@microsoft.com>
To: Kerry Lynn <kerlyn@ieee.org>, Fernando Gont <fgont@si6networks.com>
Subject: RE: I-D Action: draft-ietf-6man-default-iids-04.txt
Thread-Topic: I-D Action: draft-ietf-6man-default-iids-04.txt
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Date: Mon, 06 Jul 2015 21:15:07 +0000
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References: <20150626053554.16572.72663.idtracker@ietfa.amsl.com> <926657903.827241.1435374995889.JavaMail.yahoo@mail.yahoo.com> <5591BF9C.8080307@si6networks.com> <CAO42Z2zf5-g1aOAWfaDxX47H9w9Kyc0QEX+0oKyzL9nwzCb_DQ@mail.gmail.com> <5592370E.6070705@si6networks.com> <CAO42Z2xacdABghT5W269V9y3aucmh2QQd6AHNLK+MpsaLzeB8g@mail.gmail.com> <55931DAE.8000701@si6networks.com> <CAO42Z2ywMEfXKSSFeSd5DNvEW4URfmTKvaWgxNw6odXRHWW=Jw@mail.gmail.com> <559378AE.70506@si6networks.com> <CABOxzu0WkrFv9a-jjc7Txzg_ronsMucKXsu_7X+mfHyoVFZz0Q@mail.gmail.com> <559AB1CD.6000605@si6networks.com> <CABOxzu2iy8XBbCDv33ZKoA9VcfFj1f9FfVTv88=fSsM7krxguw@mail.gmail.com>
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From: ipv6 [mailto:ipv6-bounces@ietf.org] On Behalf Of Kerry Lynn
Sent: Monday, July 6, 2015 10:16 AM
To: Fernando Gont
Cc: ipv6@ietf.org; Dave Thaler; Ralph Droms; draft-ietf-6man-default-iids@tools.ietf.org
>> As the lead author of
>> https://tools.ietf.org/html/draft-ietf-6man-6lobac, I'm
>> strongly in favor of retaining the option to specify IIDs based on locally
>> assigned link-layer addresses, particularly for link-local addresses.
>
> FWIW, this has never been under question. That is, the question is
> regarding the wording, not about the intent. Based on past wg discussion
> and consensus, we all agree that there must be room to go against this
> advice if design/engineering tradeoffs warrant this.

Part of the problem is that "link layer address," as a category, is no well-defined.

I would prefer something stronger, like 
" Future specifications SHOULD NOT specify IPv6 address generation
   schemes that embed the underlying link-layer address in the IID.
   In some cases, where engineering constants dictate, identifiers
   MAY include a short dynamically assigned link-layer address.
   Notwithstanding that, specification MUST NOT embed a globally unique 
   identifier such as an IEEE802 address or a E.164 phone number."

The rationale is clear. Globally unique identifiers enable all kinds of evil, including tracking of devices over time and at different locations. Dynamically assigned identifiers are a lesser kind of evil. Their main issue is that they facilitate network enumeration.

-- Christian Huitema

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