manual usb0
iface usb0 inet dhcp
    pre-up echo 9 > /sys/class/gpio/export
    pre-up echo out > /sys/class/gpio/gpio9/direction
    pre-up echo 0 > /sys/class/gpio/gpio9/value
    pre-up modprobe usbserial vendor=0x2c7c product=0x6026
    pre-up modprobe rndis_host
    pre-up sleep 10
    post-down echo 1 > /sys/class/gpio/gpio9/value
    post-down echo 9 > /sys/class/gpio/unexport