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Date:   Fri, 11 Jan 2019 14:41:36 +0100
From:   Andrew Lunn <>
To:     Fredrik Gustavsson <>
Cc:     Roopa Prabhu <>,
        netdev <>,
        David Miller <>,
        Toshiaki Makita <>,
        Daniel Borkmann <>
Subject: Re: [PATCH v1 1/1] veth: Do not drop packets larger then the mtu set
 on the receiving side

> > adding a IFF_VETH just for this seems like an overkill. especially
> > when there are other ways to indicate a virtual device type like
> > rtnetlink kind.
> > Also, its best to keep such checks local to veth, maybe with something
> > along the lines of what Andrew suggests above.
> Andrew: Nice to hear that my arguments were good.

With DSA switches we somewhat rely on this behaviour, because there is
an extra header in the frame. I recently added code to automagically
increase the MTU, but that does not always work.

> For the actual use case I can not change to MTU on one of the
> interface.

Please could you explain why.


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