Hello!

I've faced a weird problem. And I totally can't understand how libvirt handles networks. The thing that i need to do is simple. I create a bridge in my ubuntu host, the following config:

iface eth0 inet manual

auto br0

iface br0 inet dhcp

bridge_ports eth0

bridge_stp on

bridge_maxwait 0

That's OK, and my bridge turns up automatically. But I don't understand why libvirt can't use it, it always want to create bridge on its own. So that when I try to create bridged network with the command:

virsh virsh net-create net.xml

net.xml contents:

<network>

<name>virbreth0</name>

<bridge name='br0' stp='on' delay='0' />

</network>

I always get error ===>

error: Failed to create network from net.xml

error: cannot create bridge 'br0': File exists

That's pretty obvious that libvirt wants to create bridge on its own. But what should I do in my specific situation. May be there is a workaround. I appreciate any help and ideas...

Thanks for your answers.

Best regards,

Denis Barishev.