virt-install ovh soyoustart

virt-install --virt-type kvm --name mysupername --ram 1024  --cdrom=/var/lib/libvirt/images/ubuntu-12.04.5-server-amd64.iso --disk /home/mysupername.qcow2,format=qcow2  --network bridge:br0  --vnc --vncport 65322 --os-type=linux  --accelerate

#host /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

#auto eth0
#iface eth0 inet static
# address 188.165.217.113
# netmask 255.255.255.0
# network 188.165.217.0
# broadcast 188.165.217.255
# gateway 188.165.217.254

auto br0
iface br0 inet static
 address 188.165.217.113
 netmask 255.255.255.0
 broadcast 188.165.217.255
 gateway 188.165.217.254

        bridge_ports eth0
        bridge_fd 9
        bridge_hello 2
        bridge_maxage 12
        bridge_stp off

# virtual /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
 hwaddress 02:13:11:65:8b:29 
 address x.y.z.s
 broadcast x.y.z.s
 netmask 255.255.255.255
post-up route add 188.165.217.254 dev eth0
post-up route add default gw 188.165.217.254

post-down route del 188.165.217.254 dev eth0
post-down route del default gw 188.165.217.254
dns-nameservers 8.8.8.8