[libvirt] Problem with Open vSwitch and dnsmasq

Dear all, I have the following situation: -I replaced the standard bridge driver with the Open VSwitch one; -I started a NAT-network on Libvirt (bridge name virbr1); -I started a Virtual Machine (VM1) on Libvirt, and I tagged his interface (vnet0) with tag=2; -if I run "# ovs-vsctl show" I obtain: Bridge "virbr1" Port "vnet0" tag: 2 Interface "vnet0" Port "virbr1-nic" Interface "virb1-nic" Port "virbr1" Interface "virbr1" type: internal -the problem is that it is impossible to assign to VM1 an IP, because the dnsmasq daemon does not accept the tagged DHCP Discover frame. Does someone know if there is a way for dnsmasq to accept tagged frames through "virbr1", and send a tagged DHCP Offer packet back to VM1? Greetings, Daniele Milani