auto eth0
iface eth0 inet static
        address 189.1.xx.xx
        netmask 255.xxx.255.0
        broadcast 189.xxx.164.255
        network 189.1.xxx.0
        gateway  189.1.xxx.1
        post-up ip route add default via xx.1.xxx.1 table eth0_if
        post-up ip rule add from 189.1.xxx.3 table eth0_if
        post-down ip rule del from 1x9.1.xxxx.3 table eth0_if