netdev - vrf and multicast problem

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Message-ID: <1e7b1aec-401d-9e70-564a-4ce96e11e1be@candelatech.com>
Date:   Wed, 9 Mar 2022 14:31:44 -0800
From:   Ben Greear <greearb@...delatech.com>
To:     netdev <netdev@...r.kernel.org>
Cc:     David Ahern <dsahern@...il.com>
Subject: vrf and multicast problem

[resend, sorry...sent to wrong mailing list the first time]

Hello,

We recently found a somewhat weird problem, and before I go digging into
the kernel source, I wanted to see if someone had an answer already...

I am binding (SO_BINDTODEVICE) a socket to an Ethernet port that is in a VRF with a second
interface.  When I try to send mcast traffic out that eth port, nothing is
seen on the wire.

But, if I set up a similar situation with a single network port in
a vrf and send multicast, then it does appear to work as I expected.

I am not actually trying to do any mcast routing here, I simply want to send
out mcast frames from a port that resides inside a vrf.

Any idea what might be the issue?

Thanks,
Ben

-- 
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc  http://www.candelatech.com