Ubuntu下使用Hostapd搭建热点

环境：Ubuntu
通过eth0连接外网，通过wlan0建立热点

1.安装isc-dhcp-server

su
apt-get install isc-dhcp-server

2.配置DHCP

vim /etc/default/isc-dhcp-server

INTERFACES="wlan0"

 vim /etc/dhcp/dhcpd.conf

option domain-name-servers 8.8.8.8, 114.114.114.114;
default-lease-time 600;
max-lease-time 7200;

subnet 10.5.5.0 netmask 255.255.255.0 {
range 10.5.5.2 10.5.5.250;
option routers 10.5.5.1;
option broadcast-address 10.5.5.255;
}

ifconfig wlan0 10.5.5.1/24
service isc-dhcp-server restart

打开数据包转发，通过iptables将无线网卡的流量转发到本机联网的端口eth0（如果你用无线上网改为wlan0）:

echo "1" > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

4.通过hostapd建热点

git clone https://github.com/OpenSecurityResearch/hostapd-wpe
wget http://hostap.epitest.fi/releases/hostapd-2.2.tar.gz
tar -zxf hostapd-2.2.tar.gz
cd hostapd-2.2
patch -p1 < ../hostapd-wpe/hostapd-wpe.patch
cd hostapd
make

新建配置文件

vim 1.conf

interface=wlan0
driver=nl80211
ssid=test
channel=6
hw_mode=g
auth_algs=1
wpa=3
wpa_passphrase=12345678
wpa_key_mgmt=WPA-PSK
wpa_pairwise=TKIP
rsn_pairwise=CCMP

./hostapd-wpe 1.conf

掏出设备尝试连接test的无线，密码12345678，测试是否能成功上网。
如果遇到以下错误：

Configuration file: hostapd.conf
nl80211: Could not configure driver mode
nl80211 driver initialization failed.
hostapd_free_hapd_data: Interface wlan0 wasn't started

请执行，并重新运行hostapd

nmcli nm wifi off
rfkill unblock wlan

参考：
http://roylez.herokuapp.com/2011/08/11/hostapd.html?utm_source=tuicool&utm_medium=referral