Someone

# This file d blah blah
#

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet dhcp


# The secondary network interface
address 192.168.1.2
netmask 255.255.255.0
iface eth2 inet static

# The tertiary network interface
address 192.168.2.1
netmask 255.255.255.0
iface eth3 inet static