auto lo eth0
              allow-hotplug eth1

              iface lo inet loopback

              mapping eth0
                   script /usr/local/sbin/map-scheme
                   map HOME eth0-home
                   map WORK eth0-work

              iface eth0-home inet static
                   address 192.168.1.4
                   netmask 255.255.255.0
                   up flush-mail

              iface eth0-work inet dhcp
              
 auto eth0          

              iface eth0 inet dhcp