From mboxrd@z Thu Jan  1 00:00:00 1970
From: Vlad Yasevich <vyasevic@redhat.com>
Subject: Re: Guest host cannot be connected to the LAN through 802.1q VLANs
Date: Fri, 08 Mar 2013 13:55:35 -0500
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To: Frank Bonnet <f.bonnet@esiee.fr>
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On 03/04/2013 02:33 AM, Frank Bonnet wrote:
> Hello
>

Not sure if this is the right list.  You might get more help on the 
qemu-devel list.

> I'm in trouble with a guest host that is not living on the same subnet
> than the hypervisor that I would like to connect to my LAN through
> 802.1q VLAN ( ubuntu 12.10 server amd64 )
>
> The hypervisor VLAN number is 30
> The guest VLAN number is 110
>
> See below the /etc/network/interfaces file of the hypervisor
>
> # The loopback network interface
> auto lo
> iface lo inet loopback
>
> # For  Guest-VM
>
> auto em1.110
> iface em1.110 inet manual
>
> auto br0-110
> iface br0-110 inet manual
> bridge_ports em1.110
> bridge_stp off
> bridge_fd 0
> bridge_maxwait 0
>
> # For Vm-Mother
>
> auto em1.30
> iface em1.30 inet manual
>
> auto br0-30
> iface br0-30 inet static
> address 147.215.1.25
> netmask 255.255.255.0
> network 147.215.1.0
> broadcast 147.215.1.255
> gateway 147.215.1.1
> dns-nameservers 147.215.1.4 147.215.128.128
> dns-search esiee.fr
> bridge_ports em1.30
> bridge_stp off
> bridge_fd 0
> bridge_maxwait 0
>
>
> IF ANYONE COULD HELP ... Thanks a LOT
>

There isn't enough information here..  Which bridge do you connect your 
vm to?

Are you attempting to configure a vlan interface in the VM?

Does the swtich you are connected to know about vlan configuration?

What behavior do you see on the VM?

Thanks
-vlad