iface lo inet loopback
 
auto eth0
allow-hotplug eth0
iface eth0 inet static
        address 192.168.0.1
        netmask 255.255.255.0
        gateway 192.168.0.254
        ucarp-vid 1
        ucarp-vip 192.168.0.3
        ucarp-password password
iface eth0:ucarp inet static
        address 192.168.0.3
        netmask 255.255.255.0