Re: New Version Notification for draft-chakrabarti-nordmark-6man-efficient-nd-05.txt

"Pascal Thubert (pthubert)" <pthubert@cisco.com> Sat, 01 March 2014 21:43 UTC

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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Erik Nordmark <nordmark@sonic.net>
Subject: Re: New Version Notification for draft-chakrabarti-nordmark-6man-efficient-nd-05.txt
Thread-Topic: New Version Notification for draft-chakrabarti-nordmark-6man-efficient-nd-05.txt
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Date: Sat, 01 Mar 2014 21:43:30 +0000
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References: <20140214235734.2509.63069.idtracker@ietfa.amsl.com> <52FF115C.30001@acm.org> <CAJE_bqdOiO2zyCvxsO4sEW+9ZMb0DoOyscNWP1=jedrBbbBkEA@mail.gmail.com> <530FA94B.3050802@acm.org> <CAJE_bqdF2-nH7GaC+j6PnRagDC0jDj0c0me6MOC6AsHNvDaedQ@mail.gmail.com>, <5311DA0F.5070106@sonic.net>
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Cc: Erik Nordmark <nordmark@acm.org>, IETF IPv6 <ipv6@ietf.org>, 神明�_哉 <jinmei@wide.ad.jp>
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A variation could be to add a new option in the RS with both the linklocal and the slla that the device wishes to use.

A NEAR would eventually perform the DAD on behalf in case of mixed mode. It could create a temp nce and answer unicast. If success then the node could register that address.

What do you think?

Pascal

> Le 1 mars 2014 ¨¤ 21:48, "Erik Nordmark" <nordmark@sonic.net> a ¨¦crit :
> 
>> On 2/28/14 11:53 PM, ÉñÃ÷ß_ÔÕ wrote:
>> 
>> I don't understand how it works in the bootstrap stage.  To send the
>> NS/ARO for a link-local address (on bootstrap), the host should first
>> know the registrar's address.  But the host can't get the information
>> by unicast RS-RA exchange since the source address of the RS would
>> need to be the link-local address to prove unique.  Or am I
>> misunderstanding your intent?
> That part isn't fully fleshed out in the draft.
> 
> To have a unicast RA prior to having registered the link-local address, the router needs to use the SLLA option in the RS - this would be the same mechanism as in the draft for sending errors to NS/AROs.
> 
> Thus the RS can have an unspecified source address while containing a SLLAO; something which isn't allowed in 4861 AFAICT. So need to look at mixed mode issues here.
> 
>   Erik
> 
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