Tutorial - Create a wifi hotspot w/ hostapd and fwd internet (works on raspberrypi)

hotstart.sh

#!/bin/bash
## Create a wifi hotspot w/ hostapd and fwd internet (works on raspberrypi)
# @author intrd - http://dann.com.br/
# @license Creative Commons Attribution-ShareAlike 4.0 International License - http://creativecommons.org/licenses/by-sa/4.0/

# /etc/network/interfaces
  # auto wlan4
  # allow-hotplug wlan4
  # iface wlan4 inet static
  #         address 10.10.0.1
  #         netmask 255.255.255.0
  #         network 10.10.0.0

# /etc/hostapd/hostapd.conf
  # interface=wlan4
  # driver=nl80211
  # #driver=rtl871xdrv
  # ssid=APINT
  # hw_mode=g
  # channel=6
  # macaddr_acl=0
  # auth_algs=1
  # ignore_broadcast_ssid=0
  # wpa=2
  # wpa_passphrase=Home123!!!
  # wpa_key_mgmt=WPA-PSK
  # wpa_pairwise=TKIP
  # rsn_pairwise=CCMP

# hot_start.sh
  sudo service hostapd stop
  #sudo hostapd /etc/hostapd/hostapd.conf &
  sudo route add 10.10.0.2 gw 10.10.0.1 wlan4
  sudo route add 10.10.0.3 gw 10.10.0.1 wlan4
  sudo route add 10.10.0.4 gw 10.10.0.1 wlan4
  sudo iptables -t nat -A POSTROUTING -o tun0 -j MASQUERADE
  sudo iptables -A FORWARD -i eth0 -o tun0 -j ACCEPT
  sudo hostapd /etc/hostapd/hostapd.conf &
  echo "nameserver 10.10.0.1" > /etc/resolv.conf