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

[Carsten Bormann <[e-mail]>]

Hemant,

it is probably best if you copy [e-mail] 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