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[6lo] FW: Generation of IPv6 IIDs

"Turner, Randy" <Randy.Turner@landisgyr.com> Thu, 24 July 2014 17:50 UTC

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From: "Turner, Randy" <Randy.Turner@landisgyr.com>
To: "'6lo@ietf.org'" <6lo@ietf.org>, "6man Chairs (6man-chairs@tools.ietf.org) (6man-chairs@tools.ietf.org)" <6man-chairs@tools.ietf.org>
Thread-Topic: [6lo] Generation of IPv6 IIDs
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Date: Thu, 24 Jul 2014 17:50:03 +0000
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Archived-At: http://mailarchive.ietf.org/arch/msg/6lo/YEAjn4BUmTg_wa3cJyKEFGkOq0A
Subject: [6lo] FW: Generation of IPv6 IIDs
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Ditto what Erik said....we operate AMI networks where most of the EUI-64 threats do not exist, and 6775 mechanisms are employed - it would be nice if EUI-64s were not "deprecated" but still allowed, with the existing alternative documents being available for those that need it.

Randy

-----Original Message-----
From: 6lo [mailto:6lo-bounces@ietf.org] On Behalf Of Erik Nordmark
Sent: Thursday, July 24, 2014 8:21 AM
To: Jonathan Hui (johui); Erik Nordmark
Cc: 6lo-chairs@tools.ietf.org; 6man Chairs (6man-chairs@tools.ietf.org); Erik Nordmark; Dave Thaler; Samita Chakrabarti; 6lo@ietf.org; Fernando Gont; draft-ietf-6man-default-iids@tools.ietf.org
Subject: Re: [6lo] Generation of IPv6 IIDs

On 7/23/14, 10:25 PM, Jonathan Hui (johui) wrote:
> Note that RFC 6282 already provides the option:
> - If the IID can be derived from MAC address, great.
> - If not, things will still work just with reduced efficiency.
>
> Section 10 of RFC 4944 also provides the same option, but has since been replaced by the encoding specified in RFC 6282.
>
> Also note that 802.15.4 interfaces have both a stable MAC address (EUI-64) and a locally-significant, dynamic MAC address (Short Address).  Many of the arguments against MAC-address-based IIDs may not apply when using Short Addresses.
>

The issue I know about is in RFC 6775 which would fail to deliver errors to an ARO if the host doesn't have a link-local address with a EUI-64-based IID.

RFC 6775 (6lowpan-nd) makes the assumption that the host always has a link-local address configured with the EUI-64 of the host.
That assumption is used in section 6.5.2 to send errors back to hosts.
Note that we already know of a solution, which is local to the router implementation, which is already captured in section 9.7 in draft-chakrabarti-nordmark-6man-efficient-nd.

    Erik


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