From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:36868) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YxySs-00063l-Gz for qemu-devel@nongnu.org; Thu, 28 May 2015 10:07:22 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YxySn-0004Wk-Fp for qemu-devel@nongnu.org; Thu, 28 May 2015 10:07:18 -0400 Received: from mx-v6.kamp.de ([2a02:248:0:51::16]:46910 helo=mx01.kamp.de) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YxySn-0004WO-3v for qemu-devel@nongnu.org; Thu, 28 May 2015 10:07:13 -0400 Message-ID: <55672104.2040800@kamp.de> Date: Thu, 28 May 2015 16:07:00 +0200 From: Peter Lieven MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Subject: [Qemu-devel] Windows2012R2 virtio-win drivers and IPv6 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: "qemu-devel@nongnu.org" Cc: Lukas Friedrichs , Vadim Rozenfeld , Gleb Natapov , Tobias Schmidt 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. Thanks, Peter