# loopback device
auto lo
iface lo inet loopback

# br-usb-device is a bridge handling two usb interfaces on the device USB port
auto br-usb-device
iface br-usb-device inet static
  address 192.168.123.123
  netmask 255.255.255.0
  broadcast 192.168.123.255

# usb-host is the connection from a slave to the master (on the "normal" USB port)
iface usb-host inet static
  address 192.168.125.125
  netmask 255.255.255.0
  broadcast 192.168.125.255
  gateway 192.168.125.124

iface eth0:1 inet static
  address 192.168.124.123
  netmask 255.255.255.0

iface wlan0 inet manual
iface eth0 inet dhcp  
