also bei mir kommt dann das:
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
auto eth0 eth0:0 eth0:1 eth0:2
iface eth0 inet static
address 83.243.43.70
netmask 255.255.255.192
network 83.243.43.64
broadcast 83.243.43.127
gateway 83.243.43.65
# dns-* options are implemented by the resolvconf package, if installed
dns-nameservers 83.243.45.254
iface eth0:0 inet static
address 83.243.43.71
netmask 255.255.255.192
broadcast 83.243.43.127
network 83.243.43.64
dns-nameservers 83.243.45.254
iface eth0:1 inet static
address 83.243.43.72
netmask 255.255.255.192
broadcast 83.243.43.127
network 83.243.43.64
dns-nameservers 83.243.45.254
iface eth0:2 inet static
address 83.243.43.73
netmask 255.255.255.192
broadcast 83.243.43.127
network 83.243.43.64
dns-nameservers 83.243.45.254
usw.....
EDIT:
welche linux distribution hast du eigentlich?