[fedora-virt] bridged guest networking in f12 with netcf

[Dale Bewley]

----- "Cole Robinson" <crobinso at redhat.com> wrote:
> On 11/15/2009 04:10 PM, Dale Bewley wrote:
...
> > [root at tofu2 network-scripts]# virsh iface-define br0.xml
> > error: Failed to define interface from br0.xml
> > error: invalid argument in virGetInterface
> > 
> > It did work however.
...
> > But now eth0 is missing from iface-list
> > 
> > [root at tofu2 network-scripts]# virsh iface-list
> > Name                 State      MAC Address
> > --------------------------------------------
> > lo                   active     00:00:00:00:00:00
> > 
> > Presumably, that's because from the libvirt / netcf perspective
> (which is just looking at the ifcfg files) I have replaced it with the
> br0 interface. However, br0 is not started, so presumably that's why
> it isn't listed either. After a 'service network restart' things look
> sane again.
> > 
> > [root at tofu2 network-scripts]# virsh iface-list
> > Name                 State      MAC Address
> > --------------------------------------------
> > br0                  active     00:24:e8:30:20:e7
> > lo                   active     00:00:00:00:00:00
> 
> Probably want to try iface-list --all here, should list inactive
> interfaces.

That's what I would expect, but I recreated the situation and tried that.
With and without --all, only lo showed up until a network restart.

> > = Network =
> > And finally, after creating this bridge, it would be nice to create
> a network which utilizes it as follows. That fails the way I attempted
> to do it.
> > 
> > [root at tofu2 ~]# cat net-bridged.xml 
> > <network>
> >   <name>bridged</name>
> >   <forward mode='route'/>
> >   <bridge name='br0' />
> > </network>
> > 
> 
> Physical device bridges are referenced directly in the VM xml, not via
> the
> virtual network XML. Example interface device block to add to your
> VM:
> 
>       <interface type='bridge'>
>         <source bridge='br0'/>
>         <mac address="11:22:33:44:55:66"/>
>       </interface>
> 
> - Cole

I understand that, but I did lose track of that in my mind. It doesn't
make much sense to refer to it as a 'network'. I do see that br0 shows
up in the network/interface selection dialog of the VM creation wizard.

One thing I just noticed is that NetworkManager is taking ownership
of eth0 and preventing the br0 from being created. One fix is to

 chkconfig NetworkManager off
 chkconfig network on
 service NetworkManager stop
 service network restart

I suppose the other solution would be to educate NetworkManager
about the new configuration, but I've never really used paid much
attention to NM. I'd have to look into how to do that properly.

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