usb-internet.sh

#!/usr/bin/env bash

set -e

PATH=/usr/bin:/bin:/usr/sbin:/sbin

interface=${1:-"usb0"}

if [ ! -d /sys/class/net/$interface ]; then
    cat - >&2 <<EOL
You don't have $interface, seems that you miss some of steps:
1) make sure you have usbnet, cdc_ether, rndis_host drivers loaded (in this order):
   for i in usbnet cdc_ether rndis_host; do modprobe \$i; done
2) make sure you phone is connected and you enable "USB Internet" on it
EOL
    exit 1
fi

echo "Configuring $interface"
sudo ifconfig usb0 192.168.111.1 netmask 255.255.255.0 up

echo "Suppose that you already have dhcpd server configured for $interface, restarting it"
service isc-dhcp-server restart

echo "Configuring device (make sure usb debugging enabled)"
adb shell netcfg rndis0 dhcp