Ok, libvirt-bin use dnsmasq for dhcp service. but, when you start your host, dnsmasq start. libvirt-bin start too.
But in this configuration, the guest don't receive ip by the dhcp, because dnsmasq has a bad configuration. But if you stop dnsmasq, and you restart libvirt-bin, dnsmasq is restart too by the libvirt daemon, and the good configuration. Guest can receive ip. For a good configuration, you must do this: /etc/init.d/dnsmasq stop /etc/init.d/libvirt-bin restart and if you do that, it's ok. When you start dnsmasq, you have this : /usr/sbin/dnsmasq -u dnsmasq but, when libvirt-bin start dnsmasq, you have this : dnsmasq --keep-in-foreground --strict-order --bind-interfaces --pid-file --conf-file --listen-address 192.168.122.1 --except-interface lo --dhcp-leasefile=/var/lib/libvirt/dhcp-default.leases --dhcp-range 192.168.122.2,192.168.122.254 In the syslog : DHCP, plage d'adresses 192.168.122.2 -- 192.168.122.254, durée de bail 1h maybe put this information in the README.Debian if it's a normal behavior. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]