[riot-devel] Border-router and multicast

Martine Lenders mail at martine-lenders.eu
Wed May 11 21:47:56 CEST 2016


Hi again,

2016-05-11 21:42 GMT+02:00 Martine Lenders <mail at martine-lenders.eu>:

> Hi Baptist,
>
> First of all, sorry for the late reply.
>
> 2016-05-11 10:05 GMT+02:00 Baptiste Clenet <bapclenet at gmail.com>:
>
>> Ok Martine,
>>
>> In the start_network.sh, create_tap(), you route
>> ip route add ${PREFIX} via fe80::2 dev ${TAP}
>> Ok so if I want multicast, I should add
>> ip route add ff04::1/64 via fe80::2 dev ${TAP}
>> But it does not work
>
>
> This doesn't surprise me at all: (1) multicast addresses don't have
> prefixes as unicast addresses have so adding with /64 doesn't make much
> sense. (2) I'm not sure you add multicast routing entries this way in
> Linux. Maybe Alex can give us a hint here.
>
> Fact is: when I ping to ff04::1 from Linux (`ping6 -I tap0 ff04::1`) there
> isn't even any ping traffic going over the tap interface (checked with
> wireshark). So it really seems to be some kind of routing problem.
>

Pinging ff04::1 from the border router itself worked by the way.

Baptiste, what was it you originally wanted to do? Maybe we can find
another solution.

Cheers,
Martine
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