setup_wifi_ap_infrastructure.txt

Setup Wifi Infrastructure Network on RPi 2

1.

apt-get update
apt-get upgrade

2.

apt-get install hostapd udhcpd

3.

/etc/udhcpd.conf

start 192.168.42.2 # This is the range of IPs that the hostspot will give to client devices.
end 192.168.42.20
interface wlan0 # The device uDHCP listens on.
remaining yes
opt dns 8.8.8.8 4.2.2.2 # The DNS servers client devices will use.
opt subnet 255.255.255.0
opt router 192.168.42.1 # The Pi's IP address on wlan0 which we will set up shortly.
opt lease 864000 # 10 day DHCP lease time in seconds

4.

/etc/default/udhcpd

DHCPD_ENABLED="no" -> #DHCPD_ENABLED="no"

5.

ifconfig wlan0 192.168.42.1

6.

/etc/network/interfaces

iface wlan0 inet dhcp  (if present)

->

iface wlan0 inet static
  address 192.168.42.1
  netmask 255.255.255.0


====

allow-hotplug wlan0
wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf
iface default inet manual

->

#allow-hotplug wlan0
#wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf
#iface default inet manual


7.

/etc/hostapd/hostapd.conf

interface=wlan0
driver=cfg80211
ssid=linksys
hw_mode=g
channel=6
macaddr_acl=0
auth_algs=1
ignore_broadcast_ssid=1
wpa=2
wpa_passphrase=qwerty123456!##@
wpa_key_mgmt=WPA-PSK
wpa_pairwise=TKIP
rsn_pairwise=CCMP

8.

/etc/default/hostapd

#DAEMON_CONF=""

->

DAEMON_CONF="/etc/hostapd/hostapd.conf"

9.

sh -c "echo 1 > /proc/sys/net/ipv4/ip_forward"

10.

/etc/sysctl.conf
(append)

net.ipv4.ip_forward=1

11.

sudo iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
sudo iptables -A FORWARD -i eth0 -o wlan0 -m state --state RELATED,ESTABLISHED -j ACCEPT
sudo iptables -A FORWARD -i wlan0 -o eth0 -j ACCEPT

12.

sudo sh -c "iptables-save > /etc/iptables.ipv4.nat"

13.

/etc/network/interfaces
(append to bottom)

up iptables-restore < /etc/iptables.ipv4.nat

14.

sudo service hostapd start
sudo service udhcpd start

15.

sudo update-rc.d hostapd enable
sudo update-rc.d udhcpd enable