اینم خروجی دستوری که گفتین:
nemanaldin@nemanaldin:~$ cat /etc/network/interfaces
auto lo
iface
lo inet loopback
auto eth1
iface eth1 inet dhcp
auto eth2
iface eth2 inet dhcp
auto ath0
iface ath0 inet dhcp
auto wlan0
iface wlan0 inet dhcp
iface ppp0 inet ppp
provider ppp0
iface eth0 inet dhcp
address 192.168.0.1
netmask 255.255.255.0