Pridaj do /etc/network/interfaces dalsi interface a pridaj ip adresy.
Pôvodné nastavenie s jednou IP na rozhraní eth1:
# The primary network interface
auto eth1
iface eth1 inet static
address 158.193.152.1
netmask 255.255.255.0
broadcast 158.193.152.255
gateway 158.193.152.38
Pridal som druhú IP adresu na eth1:0
# The primary network interface
auto eth1
iface eth1 inet static
address 158.193.152.1
netmask 255.255.255.0
broadcast 158.193.152.255
gateway 158.193.152.38
# druha IP na primarnom rozhrani
auto eth1:0
iface eth1:0 inet static
address 158.193.152.2
netmask 255.255.255.0
broadcast 158.193.152.255
gateway 158.193.152.38
a reštart
/etc/init.d/networking restart