auto eth0
    iface eth0 inet static
           address 192.168.1.57
           netmask 255.255.255.0
           gateway 192.168.1.1
           up ip addr add 192.168.0.57/24 dev eth0 label eth0:1
           down ip addr del 192.168.0.57/24 dev eth0 label eth0:1
           up ip route add 192.168.0.0/24 via 192.168.0.1 dev eth0:1 metric 20
           down ip route del 192.168.0.0/24 via 192.168.0.1 dev eth0:1 metric 20