netdev - Re: [PATCH] xen-netfront, xen-netback: Use correct minimum MTU values

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Date:   Mon, 16 Oct 2017 16:05:22 +0100
From:   Wei Liu <wei.liu2@...rix.com>
To:     Mohammed Gamal <mgamal@...hat.com>
CC:     <netdev@...r.kernel.org>, <xen-devel@...ts.xenproject.org>,
        <paul.durrant@...rix.com>, <wei.liu2@...rix.com>,
        <linux-kernel@...r.kernel.org>, <vkuznets@...hat.com>,
        <otubo@...hat.com>, <cavery@...hat.com>, <cheshi@...hat.com>,
        Juergen Gross <jgross@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>
Subject: Re: [PATCH] xen-netfront, xen-netback: Use correct minimum MTU values

On Mon, Oct 16, 2017 at 03:20:32PM +0200, Mohammed Gamal wrote:
> RFC791 specifies the minimum MTU to be 68, while xen-net{front|back}
> drivers use a minimum value of 0.
> 
> When set MTU to 0~67 with xen_net{front|back} driver, the network
> will become unreachable immediately, the guest can no longer be pinged.
> 
> xen_net{front|back} should not allow the user to set this value which causes
> network problems.
> 
> Reported-by: Chen Shi <cheshi@...hat.com>
> Signed-off-by: Mohammed Gamal <mgamal@...hat.com>

Acked-by: Wei Liu <wei.liu2@...rix.com>

CC netfront maintainers