# The primary network interface
allow-hotplug eth0
iface eth0 inet dhcp
iface eth0 inet6 manual
      pre-up sleep 5
      up dhclient -6 -nw -v eth0
      down dhclient -6 -r -v eth0
      post-up echo 1 > /proc/sys/net/ipv4/conf/eth0/proxy_arp

auto vmbr0
iface vmbr0 inet static
      address 10.0.0.1
      netmask 255.255.255.0
      bridge_ports none
      bridge_stp off
      bridge_fd 0
      post-up echo 1 > /proc/sys/net/ipv4/ip_forward
      post-up iptables -t nat -A POSTROUTING -s '10.0.0.0/24' -o eth0 -j MASQUERADE
      post-down iptables -t nat -D POSTROUTING -s '10.0.0.0/24' -o eth0 -j MASQUERADE