netdev - Re: VRF Issue Since kernel 5

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Message-ID: <db3f6cd0-aa28-0883-715c-3e1eaeb7fd1e@gmail.com>
Date:   Tue, 10 Sep 2019 17:36:04 +0100
From:   David Ahern <dsahern@...il.com>
To:     Alexis Bauvin <abauvin@...ine.net>,
        Gowen <gowen@...atocomputing.co.uk>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: VRF Issue Since kernel 5

On 9/9/19 1:01 PM, Alexis Bauvin wrote:
> Could you try swapping the local and l3mdev rules?
> 
> `ip rule del pref 0; ip rule add from all lookup local pref 1001`

yes, the rules should be re-ordered so that local rule is after l3mdev
rule (VRF is implemented as policy routing). In general, I would reverse
the order of those commands to ensure no breakage.

Also, 5.0 I think it was (too many kernel versions) added a new l3mdev
sysctl (raw_l3mdev_accept). Check all 3 of them and nmake sure they are
set properly for your use case.

These slides do not cover 5.0 changes but are still the best collection
of notes on VRF:
http://schd.ws/hosted_files/ossna2017/fe/vrf-tutorial-oss.pdf