Re: [Qemu-discuss] Host-Bridge in routed TAP Mode

[Vlad Yasevich]

On 09/26/2013 11:46 AM, Sven Gehr wrote:
> Am Mittwoch, 25. September 2013, 10:30:15 schrieb Vlad Yasevich:
>
> >   From what I understand, routed mode is just that.  It depends
> > on ip forwarding being enabled for the interfaces and it will
> > try to route the packets from your bridge out through your designated
> > interface.
>
> Exactly, all packets from/to the bridging should be routed to the interface
> eth0.

For that to happen, eth0 should have an IP address and you need to have
proper routes configured.  Also ip forwarding has to be enabled in the
interfaces.

> > What you seem to be looking for is a bridged configuration where
> > you connect the physical nic and virtial nic to the same bridge.
>
> I can not say exactly. I think my problem is that the physical interface is
> not connected to the bridge. I recognize the fact that everything works if
> I'll add it manually with:
>
> brctl addif intern eth0

This is a bridged configuration.  In this configuration one of the 
bridge ports is the physical device and all traffic is forwarded by
the bridge.

In the routed configuration, the physical device is typically not
part of the bridge.  Instead the routing table describes the
forwarding path.

> > I don't see libvirt support that in their virtual network config.
>
> I do not understand. How do I add libvirt support in my configuration?
>
> > You can used libvirt to setup a bridged interface in the Network
> > Interfaces tab though.
>
> I have no graphical interface on the system. What is missing in my xml-file?

I think what you want to do is run:
        virsh iface-bridge eth0 br0

You may then edit the xml using iface-edit command.
Then change the vm xml to use the br0 interface instead of the default 
network you crated.

-vlad
> sorry for my english, I do my best with google-translater :-(