[riot-devel] Border-router and multicast

Baptiste Clenet bapclenet at gmail.com
Mon May 9 18:55:06 CEST 2016

Martine, I added ifconfig 7 add ff04::1 to board B and I couldn't ping
f04::1 from Linux.
Any other solution?

2016-05-09 18:20 GMT+02:00 Baptiste Clenet <bapclenet at gmail.com>:
> 2016-05-09 16:44 GMT+02:00 Alexander Aring <alex.aring at gmail.com>:
>> On Mon, May 09, 2016 at 04:24:34PM +0200, Baptiste Clenet wrote:
>>> Hi Martine,
>>> Thank you for the answer.
>>> Ok ff04::1 is also a multicast address so I add it to every board with
>>> gnrc_networking and I should be able to ping them with this multicast
>>> address.
>>> Shouldn't I use:
>>> ifconfig 7 add multicast ff04::1
>>> ?
>>> I'm missing something here, could give me an explanation please:
>>> Before, I had a transceiver plugged on my linux so I was able to ping
>>> my board directly using fe80::address so I was able to use the local
>>> multicast address ff02::1, now that I use border router, I'm using a
>>> prefix 2001::db8 (why? and why documentation prefix?) Why can't I use
>>> fe80 as before?
>> because link-local ff80::/10 will not be routed, between lowpan and
>> ethernet interface, so far I know.
> ff80? You meant fe80? I was able to do ping with fe80 and lowpan0.
>> I think what you want to have is the npd proxy magic stuff. See [0].
>> Just plugin the ethernet cable and your network will be extended with
>> the 6LoWPAN nodes.
> What I want is to understand a bit better how my network works.
> Each node is inside the same PAN (let's say 0x23 by default on RIOT,
> any reason why you choose 0x23?)
> RIOT starts and we affect an link-local address fe80 so every RIOT
> node can ping another one with its link-local address.
> Then comes border-router, border router will tell every node to add a
> new ip with prefix 2001:db8::, is this right?
> How often does border router send a message to other node to say to
> add this new ip address?
> Why 2001:db8 has been chosen? and how should I choose this prefix if I
> want to use my product for commercial use?
> Why can't I ping a link-local address from Linux with the border router?
> I've got ten nodes and one linux with a border router, what I want is
> to be able to send messages to each of them (or all of them by
> multicast) at any moment, here I don't understand why I should use
> global address 2001:db8 instead of fe80::
> Thanks for your time,
>> I need to admit, I tested the manual stuff "ip -6 neigh add proxy ..."
>> only and never the ndppd (btw, there exists some offers to move this
>> handling into kernelspace to make it more easier for users).
>> If you want to test it, please share your expierence.
>> - Alex
>> [0] https://github.com/DanielAdolfsson/ndppd
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> --
> Baptiste


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