[Fedora-xen] virbr0 comes from where?

[Sadique Puthen]

Tom Horsley wrote:
> Actually I'm on centos, but I figure it probably does things
> similar to fedora. On centos I see a virbr0 bridge that gets
> created and used in clients where I pick virtual network.
>
> I've been trying to understand Xen networking, and since this
> virbr0 on centos is doing exactly what I tried unsuccessfully
> to do on a debian xen 3.2 system, I thought I'd look and
> see how it works.
>
> Easy to say, hard to do :-).
>
> I can't find any place that creates the virbr0 bridge. I don't
> see an ifcfg file to create it at boot time, and I just replaced
> the brctl command with a shell script to log all info about
> brctl calls, then invoke the original brctl, and no brctl command
> is ever issued to create virbr0!
>
> Where do it come from?
>   

This interface is brought up and configured by libvirt. So you probably 
need the libvirt source to check how it's created and configured.  
Configuration file for this can be found at /etc/libvirt/qemu/networks.

--Sadique

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