所需硬件：樹莓派、無線網卡

1.查看無線網卡是否被識別

pi@raspberrypi ~ $ sudo lsusbBus 001 Device 002: ID 0424:9512 Standard Microsystems Corp.Bus 001 Device 001: ID 1d6b:0002 linux Foundation 2.0 root hubBus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp.Bus 001 Device 004: ID 0bda:8176 Realtek Semiconductor Corp. RTL8188CUS 802.11n WLAN Adapterpi@raspberrypi ~ $

WLAN Adapter代表的就是無線網卡被系統識別，芯片是RTL8188CUS

2.無線網卡配置靜態ip地址

sudo vim /etc/network/interfaces  #配置靜態地址

pi@raspberrypi ~ $ sudo vim /etc/network/interfacesauto lo

iface lo inet loopbackiface eth0 inet dhcp

allow-hotplug wlan0iface wlan0 inet staticaddress 192.168.8.1netmask 255.255.255.0保存后重啟wlan0網卡

sudo ifdown wlan0sudo ifup wlan0

3.安裝DHCP服務軟件

sudo apt-get install isc-dhcp-server

配置DHCP服務

sudo vim /etc/dhcp/dhcpd.conf  #編輯配置文件#option domain-name "example.org";  #注釋#option domain-name-servers ns1.example.org, ns2.example.org;  #注釋authoritative; #去除注釋#在配置文件底部添加發下配置subnet 192.168.8.0 netmask 255.255.255.0 { range 192.168.8.100 192.168.8.200; option broadcast-address 192.168.8.255; option routers 192.168.8.1; default-lease-time 600; max-lease-time 7200; option domain-name "local"; option domain-name-servers 8.8.8.8, 8.8.4.4; }

sudo vim /etc/default/isc-dhcp-server #編輯配置文件INTERFACES="wlan0"

4.安裝AP軟件與配置

sudo apt-get install hostapd配置access Point sudo vim /etc/hostapd/hostapd.confinterface=wlan0driver=rtl871xdrv#這個是樹莓派無線網卡驅動，不要改ssid=pi#無線信號名字，隨意設hw_mode=gchannel=6macaddr_acl=0auth_algs=1ignore_broadcast_ssid=0wpa=2wpa_passphrase=raspberry#密碼，隨意設wpa_key_mgmt=WPA-PSKwpa_pairwise=TKIPRsn_pairwise=CCMP

設置讀取加載配置文件

sudo vim /etc/default/hostapd   #找到#DAEMON_CONF=""修改成DAEMON_CONF="/etc/hostapd/hostapd.conf" 

默認安裝的版本比較新，該驅動需要用V0.8的版本，否則運行hostapd會報錯

wget http://www.adafruit.com/downloads/adafruit_hostapd.zip unzip adafruit_hostapd.zip sudo mv /usr/sbin/hostapd /usr/sbin/hostapd.ORIG sudo mv hostapd /usr/sbin sudo chmod 755 /usr/sbin/hostapd

sudo /usr/sbin/hostapd /etc/hostapd/hostapd.conf

5.啟動dhcp、hostapd服務

sudo service isc-dhcp-server start  #啟用DHPCServere服務sudo service hostapd start #啟用AP服務

設置開啟自啟動

sudo update-rc.d hostapd enable sudo update-rc.d isc-dhcp-server enable

6.開啟轉發

sudo vim /etc/sysctl.conf  #開機啟動設置ip轉發#底部加上一行net.ipv4.ip_forward=1或者直接：sudo sh -c "echo 1 > /proc/sys/net/ipv4/ip_forward"

7.添加防火墻規則

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

8.保存規則并開機自動生效

sudo sh -c "iptables-save > /etc/iptables.ipv4.nat" sudo vim /etc/network/interfaces   #開機生效up iptables-restore < /etc/iptables.ipv4.nat #底部增加一行

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后記：如果有兩個無線網卡，又想設置兩個AP，那么可以修改/etc/network/interfaces和/etc/dhcp/dhcpd.conf以及添加一個/etc/hostapd/hostapd2.conf

如下：

pi@raspberrypi ~ $ sudo vim /etc/network/interfacesauto lo

iface lo inet loopbackiface eth0 inet dhcp

allow-hotplug wlan0iface wlan0 inet staticaddress 192.168.8.1netmask 255.255.255.0

#繼續添加

auto wlan1iface wlan0 inet staticaddress 192.168.9.1netmask 255.255.255.0network 192.168.9.0broadcast 192.168.9.255

接著，修改/etc/default/isc-dhcp-server文件，添加wlan1

sudo vim /etc/default/isc-dhcp-server #編輯配置文件INTERFACES="wlan0"

接著，修改/etc/dhcp/dhcpd.conf

sudo vim /etc/dhcp/dhcpd.conf  #編輯配置文件#option domain-name "example.org";  #注釋#option domain-name-servers ns1.example.org, ns2.example.org;  #注釋authoritative; #去除注釋#在配置文件底部添加發下配置subnet 192.168.8.0 netmask 255.255.255.0 { range 192.168.8.100 192.168.8.200; option broadcast-address 192.168.8.255; option routers 192.168.8.1; default-lease-time 600; max-lease-time 7200; option domain-name "local"; option domain-name-servers 8.8.8.8, 8.8.4.4; }#繼續添加

subnet 192.168.9.0 netmask 255.255.255.0 { range 192.168.9.100 192.168.9.200; option broadcast-address 192.168.9.255; option routers 192.168.9.1; default-lease-time 600; max-lease-time 7200; option domain-name "local"; option domain-name-servers 8.8.8.8, 8.8.4.4; }最后，添加一個/etc/hostapd/hostapd2.conf，內容類似hostapd.conf，但是channel要不一樣，否則出現干擾

interface=wlan1driver=rtl871xdrv#這個是樹莓派無線網卡驅動，不要改ssid=pi2#無線信號名字，隨意設hw_mode=gchannel=2macaddr_acl=0auth_algs=1ignore_broadcast_ssid=0wpa=2wpa_passphrase=raspberry#密碼，隨意設wpa_key_mgmt=WPA-PSKwpa_pairwise=TKIPrsn_pairwise=CCMP如此，啟動

sudo /usr/sbin/hostapd /etc/hostapd/hostapd.conf /etc/hostapd/hostapd2.conf即可啟動兩個AP，如果加上-B，可運行于后臺。------------------------------------------------------------------------------------------此外，如果想配置成wlan0 ap模式，wlan1 連接路由器模式，可以修改/etc/network/interfaces文件，添加wlan1的設置即可。

auto wlan1allow-hotplug wlan1iface wlan1 inet dhcpwpa-ssid "SDN2.4"wpa-psk "404404404"

重啟wlan1（sudo ifdown wlan1 sudo ifup wlan1）即可。