I have an onboard Realtek 8100C chipset.
Code:
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet dhcp
#auto eth1
#iface eth1 inet dhcp
#auto eth2
#iface eth2 inet dhcp
#auto ath0
#iface ath0 inet dhcp
#auto wlan0
#iface wlan0 inet dhcp
As you can see, I've already tried commenting out the ones that don't exist.