netdev - Re: IPv6 over IEEE 802.15.4 aka 6LoWPAN

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Date:	Wed, 06 Aug 2014 14:02:40 +0530
From:	Varka Bhadram <varkabhadram@...il.com>
To:	Alexander Aring <alex.aring@...il.com>
CC:	davem@...emloft.net, kuznet@....inr.ac.ru, jmorris@...ei.org,
	yoshfuji@...ux-ipv6.org, kaber@...sh.net, netdev@...r.kernel.org,
	linux-wpan@...r.kernel.org
Subject: Re: IPv6 over IEEE 802.15.4 aka 6LoWPAN - Neighbor discovery issue

On 08/06/2014 01:17 PM, Alexander Aring wrote:
>>>> Handing of RS (Router Solicitation) and RA (Router Advertisement) will take care
>>>> by radvd (Router Advertisement Daemon) in Linux. We added the ABRO and 6CO option
>>>> support in radvd. You can find the implementation in [1].
>>>>
>>>>
>>>> [1]: https://github.com/reubenhwk/radvd/blob/master/send.c#L536
>>>>
>>> I see you use the ContextID there, then you need the CID value from
>>> 6LoWPAN header there. I am very interest for patches which introduce
>>> context based address compression and make it also available in
>>> userspace to handle the ContextID with radvd.
>> Right now we providing the contextID from user space through radvd.conf.
>>
>> Context based implementation is not supported so we are only using the
>> context identifier from user space.
>>
> A static CID value in radvd.conf? Sorry, I don't know how this can be
> working without very limitations of use.

Actually we have to get the CID from the 6LoWPAN packet and we have to
update or store the CID based information into a separate table.

For each and every CID we are going to have the its own info.

If CID is changed we have to increment the *version* field in ABRO option
and sends RA message. This support is future work if we have the CID based
compression.


-- 
Regards,
Varka Bhadram.

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