auto lo
iface lo inet loopback

auto eth0
iface eth0 inet manual
        address         10.0.0.3
        gateway         10.0.0.1
        netmask         255.255.255.0

allow-hotplug wlan0
iface wlan0 inet manual
wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf
iface default inet dhcp