From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:41379) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Z1sAQ-0004j6-CN for qemu-devel@nongnu.org; Mon, 08 Jun 2015 04:12:23 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Z1sAM-00018E-7N for qemu-devel@nongnu.org; Mon, 08 Jun 2015 04:12:22 -0400 Received: from mx-v6.kamp.de ([2a02:248:0:51::16]:48819 helo=mx01.kamp.de) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Z1sAL-00016i-TZ for qemu-devel@nongnu.org; Mon, 08 Jun 2015 04:12:18 -0400 Message-ID: <55754E5D.4090205@kamp.de> Date: Mon, 08 Jun 2015 10:12:13 +0200 From: Peter Lieven MIME-Version: 1.0 References: <55672104.2040800@kamp.de> <1432823072.1732.33.camel@oscar> In-Reply-To: <1432823072.1732.33.camel@oscar> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] Windows2012R2 virtio-win drivers and IPv6 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Vadim Rozenfeld , yvugenfi@redhat.com Cc: Lukas Friedrichs , "qemu-devel@nongnu.org" , Gleb Natapov , Tobias Schmidt Am 28.05.2015 um 16:24 schrieb Vadim Rozenfeld: > On Thu, 2015-05-28 at 16:07 +0200, Peter Lieven wrote: >> Hi, >> >> we observed problems with Windows Update Services and Uploading Files from a Windows System to other systems. >> We tracked this down to IPv6 connections only. IPv4 and IPv6 in Receive direction seems to be not a problem. >> It turned out that setting TCP/UDP Checksum Offloading for IPv6 from "RX/TX enabled" to RX "enabled" in the >> Network Driver settings solved the issue. I remember similar problems existed with Linux some time ago. >> Linux guests on the same host are also not an issue. >> >> Is this a known issue? I tried latest and stable drivers from the Fedora Website. >> > Adding Yan. Hi Yan, have you had a chance to look at this or a hint where to start? Thanks, Peter