netdev - Re: IPv6 multicast with VRF

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Message-ID: <b5eedf0d-1866-2b8c-10a7-d682060ae6cd@gmail.com>
Date:   Thu, 21 Apr 2022 17:44:29 -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 4/21/22 3:24 AM, Vladimir Oltean wrote:
>>>  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)
> 
> Could you explain why specifying the oif is needed here? If I don't do

multicast and linklocal are local to a device, so you need to specify
which interface to use.

> it, I still can't find the route. Either that, or what would an
> application need to do to find the route from the VRF FIB?

applications bind their sockets to a VRF device or a port device.