Mine

# /etc/network/interfaces -- configuration file for ifup(8), ifdown(8)
#
# If you are using the MEPIS network configuration for kernel 2.6.15 and above
# DO NOT use this file to define wireless options
#

#mapping hotplug
#script echo

auto lo
iface lo inet loopback

# DO NOT EDIT BELOW THIS LINE
auto eth0
allow-hotplug eth0
iface eth0 inet dhcp
  address 192.168.79.1
  netmask 255.255.255.0
  broadcast 192.168.79.255
  gateway 192.168.79.1
#auto eth1
allow-hotplug eth1
iface eth1 inet dhcp
  address 192.168.79.1
  netmask 255.255.255.0
  broadcast 192.168.79.255
  gateway 192.168.79.1
#auto eth2
allow-hotplug eth2
iface eth2 inet dhcp
  address 192.168.79.1
  netmask 255.255.255.0
  broadcast 192.168.79.255
  gateway 192.168.79.1
#auto ath0
allow-hotplug ath0
iface ath0 inet dhcp
  address 192.168.79.1
  netmask 255.255.255.0
  broadcast 192.168.79.255
  gateway 192.168.79.1
#auto wlan0
allow-hotplug wlan0
iface wlan0 inet dhcp
  address 192.168.79.1
  netmask 255.255.255.0
  broadcast 192.168.79.255
  gateway 192.168.79.1
# DO NOT EDIT ABOVE THIS LINE