Linux AP

clean_wap.sh

#!/bin/bash
export DEV_IN=wlan0;

ifconfig $DEV_IN down;
/etc/init.d/hostapd stop
/etc/init.d/dnsmasq stop
iptables -Z
iptables -F
iptables -X
ifconfig $DEV_IN up;

dnsmasq.conf

# /etc/dnsmasq.conf

interface=wlan0
dhcp-range=192.168.0.150,192.168.0.170,12h

hostapd.conf

# /etc/hostapd/hostapd.conf

ssid=Bait
interface=wlan0
hw_mode=g
channel=9

# for WPA
wpa=1
wpa_passphrase=whatever password

make_wap.sh

#!/bin/bash
export DEV_IN=wlan0;
export DEV_OUT=eth0;

echo "Bringing up $DEV_IN"
#This address/mask should match how you configured dnsmasq
ifconfig $DEV_IN up 192.168.0.129 netmask 255.255.255.0

echo "Starting dnsmasq"
/etc/init.d/dnsmasq start

echo "Configuring iptables"
#Clear everything in iptables
iptables -Z;
iptables -F;
iptables -X;

#Turn on iptables NAT, forwarding, and enable 
#forwarding in the kernel
iptables --table nat --append POSTROUTING --out-interface $DEV_OUT -j MASQUERADE
iptables --append FORWARD --in-interface $DEV_IN -j ACCEPT
sysctl -w net.ipv4.ip_forward=1

echo "Starting hostapd"
/etc/init.d/hostapd start
#hostapd /etc/hostapd/hostapd.conf