auto lo
iface lo inet loopback

auto eth0:0
iface eth0:0 inet static
name Ehernet inet static
address aaa.xxx.b.x12
netmas 255.255.255.0
broadcast aaa.xxx.b.255
network   aaa.xxx.b.0

auto eth0:1
iface eth0:1 inet static
nambe Ethernet alias2 LAN card
addres aaa.xxx.b.x13
netmask 255.255.255.0
broadcast aaa.xxx.b.255
network aaa.xxx.b.0