On 05/09/2017 04:08 AM, Nicolas Kovacs wrote: > I'd like this machine to also be a KVM virtualization host, so I > installed qemu-kvm and libvirt. The interface facing the LAN is enp3s0, > so I created a virbr0 bridge like this. virbr0 is a device managed by libvirt, and it'll come up later than the devices managed by the network or NetworkManager services. Don't enslave your ethernet devices to it. Instead, create a new bridge. Revert your changes and run: virsh iface-bridge enp3s0 br0 --no-stp