On 11/05/2015 09:33 AM, lejeczek wrote: You could make that happen automatically with a libvirt "network hook": http://libvirt.org/hooks.html You would want to create a hook script in /etc/libvirt/hooks/network that takes action (restarts dhcrelay) when $1 is the network in question, and $2 is "started" (you may also want to take action when $2 is "stopped" just for symmetry). You'll be able to learn the name of the bridge device by examining the XML of the network that your script will receive on stdin. Searching for "network" on the above page will give more details about what is possible.