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[Qemu-discuss] qemu guests using 802.1q vlans bridged on host

From: Stephan von Krawczynski
Subject: [Qemu-discuss] qemu guests using 802.1q vlans bridged on host
Date: Thu, 22 Aug 2013 16:39:23 +0200

Hello all,

I'd like to do something very simple - at least that's what I thought ;-)
I want a guest to have access to a network just as if he was connected to the
real card, but set up as bridge on the host and virtio network driver. The
guest should be able to configure and use some or maybe even many 802.1q vlans
on this network and the traffic should go out tagged.

So I setup the hosts bridge and connected an intel network card and a qemu
virtio card. Now the problem: No vlan-tagged traffic from the physical
interface reaches the guest at all, and no vlan-tagged traffic from the guest
reaches the physical net over the bridge. One major reason for this is the
vlan offloading by the host interface card (intel). Another seems to be that
arp requests are somehow not going through the bridge for the vlans.

I hope that someone here has used 802.1q vlans inside guests before and can
share some tips how to make this work. Because out-of-the-box it does not. All
system are linux of course and with latest kernels (3.10.9 currently).
qemu is 1.5.2.
Thanks for any hints.


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