#--- Loopback interface ---
auto lo
iface lo inet loopback
#--------------------------

#--- eth0 connected to the internet dhcp ---
# auto eth0
# iface eth0 inet dhcp
#-------------------------------------------

#--- eth0 connected to the internet static ---
auto eth0
iface eth0 inet static
    address 192.168.200.1
    netmask 255.255.255.0
#---------------------------------------------