让Linux成为一个wifi热点

以Linux mint为例。

安装相关软件

$ sudo apt-get install isc-dhcp-server
$ sudo apt-get install apparmor
$ sudo apt-get install hostapd

下载https://github.com/eexpress/eexp-bin/blob/master/ap.bash，保存为ap.sh：

#!/bin/bash

#● ai hostapd dhcp3-server 
iw list|grep '* AP'
[ $? -ne 0 ] && echo "No device support AP mode." && exit

sudo ifconfig wlan0 192.168.0.1 netmask 255.255.255.0
sudo sysctl -w net.ipv4.ip_forward=1
sudo iptables -t nat -F
sudo iptables -t nat -A POSTROUTING -j MASQUERADE
sudo pkill -9 dhcpd

if [ ! -f /etc/apparmor.d/disable/usr.sbin.dhcpd ]; then
sudo ln -s /etc/apparmor.d/usr.sbin.dhcpd /etc/apparmor.d/disable/
sudo /etc/init.d/apparmor restart
fi

cat > /tmp/dhcpd.conf << EOF
default-lease-time 600;
max-lease-time 7200;
subnet 192.168.0.0 netmask 255.255.255.0
{
 range 192.168.0.2 192.168.0.250;
 option domain-name-servers 8.8.8.8;
 option routers 192.168.0.1;
}
EOF
sudo dhcpd wlan0 -cf /tmp/dhcpd.conf -pf /var/run/dhcp-server/dhcpd.pid

cat > /tmp/hostapd.conf << EOF
interface=wlan0
driver=nl80211
ssid=`hostname`-hostapd
hw_mode=g
channel=11
auth_algs=1
# 如果需要开启密码，wpa=1。
wpa=0
wpa_passphrase=12345678
wpa_key_mgmt=WPA-PSK
wpa_pairwise=TKIP
rsn_pairwise=CCMP
EOF
sudo hostapd -d /tmp/hostapd.conf

启动：

$ bash ap.sh

资料

How do I create a WiFi hotspot sharing wireless internet connection (single adapter)?
https://github.com/eexpress/eexp-bin/blob/master/ap.bash
建立无线热点-脚本-AP-hostapd-dhcpd，给没root的android手机使用。
ubuntu建立WiFi热点
Ubuntu 13.04 如何配置AP模式的WIFI热点？