From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:41096) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Yxyjn-0000Ga-78 for qemu-devel@nongnu.org; Thu, 28 May 2015 10:24:48 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Yxyjg-00024W-Rc for qemu-devel@nongnu.org; Thu, 28 May 2015 10:24:47 -0400 Received: from mx1.redhat.com ([209.132.183.28]:37237) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Yxyjg-00024K-Lg for qemu-devel@nongnu.org; Thu, 28 May 2015 10:24:40 -0400 Message-ID: <1432823072.1732.33.camel@oscar> From: Vadim Rozenfeld Date: Fri, 29 May 2015 00:24:32 +1000 In-Reply-To: <55672104.2040800@kamp.de> References: <55672104.2040800@kamp.de> Content-Type: text/plain; charset="UTF-8" Mime-Version: 1.0 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: yvugenfi@redhat.com, Peter Lieven Cc: Lukas Friedrichs , "qemu-devel@nongnu.org" , Gleb Natapov , Tobias Schmidt 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. Best regards, Vadim. > Thanks, > Peter >