[riot-devel] Border-router and multicast

Martine Lenders mail at martine-lenders.eu
Tue May 10 09:48:32 CEST 2016


Hi Baptiste,
since IEEE 802.15.4 itself is not a multicast medium (it only supports
broadcast), and we don't have MLD implemented at this point (which
configures routers for multicast), multicast is indeed tricky at the
moment. Let me try something out and I come back to you.

Cheers,
Martine

2016-05-10 9:03 GMT+02:00 Baptiste Clenet <bapclenet at gmail.com>:

> Thanks Alex for your answer.
>
> 2016-05-09 19:07 GMT+02:00 Alexander Aring <alex.aring at gmail.com>:
> > Hi,
> >
> > On Mon, May 09, 2016 at 06:20:48PM +0200, Baptiste Clenet wrote:
> >> 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.
> >
> > Sorry, I think I misunderstood here something completely.
> >
> > Your setup what is it?
> >
> > Linux (802.15.4/6LoWPAN) <-> RIOT
> >
> I used this and I was able to ping6 -I lowpan0 fe80:: but now I use second
> one
>
> > or
> >
> > Linux -> TAP (ethernet) <-> RIOT BORDER ROUTER <-> RIOT
>
> Now my setup is like this, yes and so what you explain make sense for
> the RIOT border router, they do what you explain but with RIOT instead
> of Linux :)
>
> My last question is how to send multicast information from Linux to my
> local network? What Martine tell me to try did not work
>
> >
> > You say something with lowpan0 then I think it's the first one, but I am
> > not sure now and confused. :-)
> >
> > It's a important information, if it's the second one then better
> > completely ignore what I said before, because I don't know how this
> > works exactly.
> >
> > - Alex
> > _______________________________________________
> > devel mailing list
> > devel at riot-os.org
> > https://lists.riot-os.org/mailman/listinfo/devel
>
>
>
> --
> Baptiste
> _______________________________________________
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