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

From: Peter Lieven
Subject: [Qemu-devel] Windows2012R2 virtio-win drivers and IPv6
Date: Thu, 28 May 2015 16:07:00 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0


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 


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