qemu сеть не работает

 qemu -net nic,vlan=0 -net tap,vlan=0,ifname=tap0,script=/etc/qemu-ifup -m 256 -vnc 0 /backup/sarge.img

warning: could not configure /dev/net/tun: no virtual network emulation
Could not initialize device 'tap'
стартую от рута
вот мой /etc/network/interfaces

allow-hotplug eth0
auto eth0
iface eth0 inet static
address 0.0.0.0

auto br0
 iface br0 inet static
  address x.x.x.x
  network x.x.x.x
  netmask 255.255.255.224

   broadcast x.x.x.x
    gateway x.x.x.x
    dns-nameservers x.x.x.x
     bridge_ports eth0
     bridge_fd 9
   bridge_hello 2
          bridge_maxage 12
   bridge_stp off

auto tap0
iface tap0 inet static
address x.x.x.x.x
  network x.x.x.x
  netmask x.x.x.x
   broadcast x.x.x.x.x
    gateway x.x.x.x.x
    dns-nameservers x.x.x.x
     bridge_fd 9
   bridge_hello 2
          bridge_maxage 12
   bridge_stp off

вот мой /etc/qemu-ifup

#!/bin/sh

echo "Executing /etc/qemu-ifup"
echo "Bringing up $1 for bridged mode..."
sudo /sbin/ifconfig $1 0.0.0.0 promisc up
echo "Adding $1 to br0..."
sudo /usr/sbin/brctl addif br0 $1
sleep 2