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Re: [Qemu-devel] Windows2012R2 virtio-win drivers and IPv6

From: Yan Vugenfirer
Subject: Re: [Qemu-devel] Windows2012R2 virtio-win drivers and IPv6
Date: Wed, 10 Jun 2015 10:49:14 +0300

> On Jun 8, 2015, at 11:12 AM, Peter Lieven <address@hidden> wrote:
> 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?

Sorry Peter, somehow I missed the email and saw it only now.

* When you experience the issues is it between VMs on the same host? 

* Can you describe your host network configuration? 

* Can provide the output for "ethtool -k” for every NIC (including tap devices) 
in the host that is involved with the VM that has a problem?

 * What are the host kernel version, QEMU version and guest driver version you 
are using?


> Thanks,
> Peter

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