netdev - Re: IPv6 multicast with VRF

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Message-ID: <a5fdf1dc-61ef-29ba-91c3-5339c4086ec8@gmail.com>
Date:   Wed, 20 Apr 2022 14:40:53 -0600
From:   David Ahern <dsahern@...il.com>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     netdev@...r.kernel.org
Subject: Re: IPv6 multicast with VRF

On 4/20/22 1:18 PM, Vladimir Oltean wrote:
> On Wed, Apr 20, 2022 at 12:59:45PM -0600, David Ahern wrote:
>> Did you adjust the FIB rules? See the documentation in the kernel repo.
> 
> Sorry, I don't understand what you mean by "adjusting". I tried various
> forms of adding an IPv6 multicast route on eth0, to multiple tables,
> some routes more generic and some more specific, and none seem to match
> when eth0 is under a VRF, for a reason I don't really know. This does
> not occur with IPv4 multicast, by the way.
> 
> By documentation I think you mean Documentation/networking/vrf.rst.
> I went through it but I didn't notice something that would make me
> realize what the issue is.

try this:
    https://static.sched.com/hosted_files/ossna2017/fe/vrf-tutorial-oss.pdf
slide 79 and on

> 
>> And add a device scope to the `get`. e.g.,
>>
>>     ip -6 route get ff02::1%eth0
> 
> I'm probably not understanding this, because:
> 
>  ip -6 route get ff02::1%eth0
> Error: inet6 prefix is expected rather than "ff02::1%eth0".

ip -6 ro get oif eth0 ff02::1

(too many syntax differences between tools)