script for android to send wifi tethering traffic over openVPN

vpnfw.sh

#!/bin/sh
# requires ROOT privileges on android
# save this file to /data/local/vpnfw.sh on device. open new terminal on device and type:
# chmod 777 /data/local/vpnfw.sh
# connect to openVPN server first, then turn on wifi tethering
# execute script by typing:
# sh /data/local/vpnfw.sh
iptables -t filter -F FORWARD
iptables -t nat -F POSTROUTING
iptables -t filter -I FORWARD -j ACCEPT
iptables -t nat -I POSTROUTING -j MASQUERADE
ip rule add from 192.168.43.0/24 lookup 61
ip route add default dev tun0 scope link table 61
ip route add 192.168.43.0/24 dev wlan0 scope link table 61
ip route add broadcast 255.255.255.255 dev wlan0 scope link table 61
# change DNS servers to censurfridns for backup
setprop net.dns1 89.233.43.71
setprop net.dns2 91.239.100.100