From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753833AbdJPPzy (ORCPT ); Mon, 16 Oct 2017 11:55:54 -0400 Received: from smtp.citrix.com ([66.165.176.89]:60080 "EHLO SMTP.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751720AbdJPPzx (ORCPT ); Mon, 16 Oct 2017 11:55:53 -0400 X-Greylist: delayed 2020 seconds by postgrey-1.27 at vger.kernel.org; Mon, 16 Oct 2017 11:55:51 EDT X-IronPort-AV: E=Sophos;i="5.43,387,1503360000"; d="scan'208";a="446410661" Date: Mon, 16 Oct 2017 16:05:22 +0100 From: Wei Liu To: Mohammed Gamal CC: , , , , , , , , , Juergen Gross , Boris Ostrovsky Subject: Re: [PATCH] xen-netfront, xen-netback: Use correct minimum MTU values Message-ID: <20171016150522.nebui653rkjove7r@citrix.com> References: <1508160032-21689-1-git-send-email-mgamal@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <1508160032-21689-1-git-send-email-mgamal@redhat.com> User-Agent: NeoMutt/20170113 (1.7.2) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 > Signed-off-by: Mohammed Gamal Acked-by: Wei Liu CC netfront maintainers