Re: [6lowpan] off-link model in the 6lowpan talk: draft-ietf-6lowpan-nd-07

Carsten presented 6lowpan-nd to 6man today, which was useful. A  
comment that came in from Dave Thaler was to re-use the autoconf  
model. Everyone should take a look at:

http://tools.ietf.org/html/draft-ietf-autoconf-adhoc-addr-model-00

This greatly simplifies the editorial/terminology work for us in  
6lowpan. It looks like we can directly reference this autoconf  
addressing model. It should remove about 3-4 pages from our draft ;-)  
They have come to the same conclusions regarding the off-link model,  
use of IPv6 addresses and DAD. Otherwise it looks like 6lowpan-nd is  
technically compatible with that model.

Zach

On Nov 10, 2009, at 10:34 , Carsten Bormann wrote:

> Hemant,
>
> it is probably best if you copy 6lowpan@ietf.org for discussing this.
>
>> Note that if the multi-link, multi-hop network has all client nodes  
>> as off-link to each other, then there is only one type of regular  
>> ND (RFC4861) RA that can signal off-link.  This is an RA with no  
>> PIO (Prefix Information Option).
>
> Our RAs typically have a PIO with L bit off and A bit on (actually  
> usually a 6IO with a couple bits of additional information, but  
> since -07 the classic PIO works too).
>
>> So if the RA has no PIO, how are the lowpann client nodes acquiring  
>> their IPv6 address global address without SLAAC getting no prefix  
>> from?  In 6man, we would like to know how are the lowpan clients  
>> acquiring their address and do they even have a global v6 address?
>
> Yes, they do have global addresses; that is the whole point of  
> running IPv6.
>
>> I think I heard some mention of ULA, so that gives me a hint of  
>> global address use because ULA has same scope as a Globally Unique  
>> Address (GUA).
>
> The slide about ULA was for the disconnected case ("ad-hoc LoWPAN").
>
>> Therefore it would be interesting to see the IPv6 ND RA config on  
>> the lowpan edge routers.
>>
>> Anyone has working models of this work to demo to us during any  
>> future IETF?
>
> I'm sure that can be arranged in Anaheim.
> (Does anyone have an implementation with them here in Hiroshima?)
>
> Gruesse, Carsten
>
>
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Zach Shelby
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