---------------------------------------------
| wlan0 | eth0 |
LAN PC Raspberry Pi Modem
IP: 192.168.1.100 WAN eth0: 192.168.0.100 IP: 192.168.0.1
GW: 192.168.1.1 LAN wlan0: 192.168.1.1
2. 準備一張Edimax EW-7811Un無線網卡wlan0，當作Raspberry Pi的LAN內建的Ethernet網卡eth0，當作Raspberry Pi的WAN
http://www.edimax.com/edimax/merchandise/merchandise_detail/data/edimax/tw/wireless_adapters_n150/ew-7811un/
$ lsusb Bus 001 Device 005: ID 3538:0901 Power Quotient International Co., Ltd Bus 001 Device 004: ID 7392:7811 Edimax Technology Co., Ltd EW-7811Un 802.11n Wireless Adapter [Realtek RTL8188CUS] Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. SMSC9512/9514 Fast Ethernet Adapter Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub4. 安裝hostapd套件，讓無線網卡模擬成Soft AP
$ sudo apt-get install hostapd由於內建的hostapd不支援此張網卡，需要先移除hostpad程式，但保留相關的設定檔
$ sudo apt-get remove hostapd5. Edimax EW-7811Un的驅動程式，需要從Realtek官網下載，請選擇RTL8188CUS的Linux版本
首頁 > 下載中心 > 通訊網路 ICs > Wireless LAN ICs > WLAN NIC > IEEE 802.11b/g/n Single-Chip > Software > RTL8188CUS Linux
http://www.realtek.com/downloads/downloadsView.aspx?Langid=2&PNid=21&PFid=48&Level=5&Conn=4&DownTypeID=3&GetDown=false&Downloads=true#2742
透過wget命令，下載原廠無線網卡驅動程式到Raspberry Pi
$ wget http://12244.wpc.azureedge.net/8012244/drivers/rtdrivers/cn/wlan/0001-RTL8188C_8192C_USB_linux_v4.0.2_9000.20130911.zip6. 安裝hostapd程式
$ unzip 0001-RTL8188C_8192C_USB_linux_v4.0.2_9000.20130911.zip $ cd RTL8188C_8192C_USB_linux_v4.0.2_9000.20130911/wpa_supplicant_hostapd/ $ tar -zxvf wpa_supplicant_hostapd-0.8_rtw_r7475.20130812.tar.gz $ cd wpa_supplicant_hostapd-0.8_rtw_r7475.20130812/hostapd $ make clean && make && sudo make install將hostapd相關檔案複製到/usr/bin
$ sudo cp /usr/local/bin/hostapd* /usr/sbin7. 安裝wireless工具
$ cd ../../../wireless_tools $ tar -zxvf wireless_tools.30.rtl.tar.gz $ cd wireless_tools.30.rtl $ make clean && make && sudo make install8. 建立hostapd設定檔
driver: 無線網卡的驅動程式 ssid: 基地台名稱。 channel: 無線通訊的頻道，從1到11 wpa: 無線網路加密協定，1是WPA，2是WPA2 wpa_passphrase: 無線基地台的密碼。
$ sudo vi /etc/hostapd/hostapd.conf interface=wlan0 driver=rtl871xdrv bridge=br0 ssid=pi channel=6 hw_mode=g ieee80211n=1 wmm_enabled=1 wpa=2 wpa_passphrase=raspberry wpa_key_mgmt=WPA-PSK wpa_pairwise=TKIP rsn_pairwise=CCMP auth_algs=1 macaddr_acl=0測試hosapd設定檔
$ sudo hostapd -dd /etc/hostapd/hostapd.conf如沒有出現錯誤，按Ctrl+C停止hostapd，編輯hostapd服務設定檔
$ sudo vi /etc/default/hostapd # Defaults for hostapd initscript # # See /usr/share/doc/hostapd/README.Debian for information about alternative # methods of managing hostapd. # # Uncomment and set DAEMON_CONF to the absolute path of a hostapd configuration # file and hostapd will be started during system boot. An example configuration # file can be found at /usr/share/doc/hostapd/examples/hostapd.conf.gz # #DAEMON_CONF="" DAEMON_CONF="/etc/hostapd/hostapd.conf" # Additional daemon options to be appended to hostapd command:- # -d show more debug messages (-dd for even more) # -K include key data in debug messages # -t include timestamps in some debug messages # # Note that -B (daemon mode) and -P (pidfile) options are automatically # configured by the init.d script and must not be added to DAEMON_OPTS. # #DAEMON_OPTS=""啟動hostapd服務
$ sudo service hostapd restart開機時自動啟動hostapd服務
$ sudo update-rc.d hostapd defaults9. 修改無線網路卡的設定值，設定一個指定的靜態 IP 位址
$ sudo vi /etc/network/interfaces # interfaces(5) file used by ifup(8) and ifdown(8) # Please note that this file is written to be used with dhcpcd # For static IP, consult /etc/dhcpcd.conf and 'man dhcpcd.conf' # Include files from /etc/network/interfaces.d: source-directory /etc/network/interfaces.d auto lo iface lo inet loopback iface eth0 inet manual allow-hotplug wlan0 iface wlan0 inet static address 192.168.1.1 netmask 255.255.255.010. 路由模式需要在Raspberry Pi架設DHCP Server
$ sudo apt-get -y install udhcpd將DHCPD_ENABLED="no"加上註解
$ sudo vi /etc/default/udhcpd # Comment the following line to enable #DHCPD_ENABLED="no" # Options to pass to busybox' udhcpd. # # -S Log to syslog # -f run in foreground DHCPD_OPTS="-S"修改DHCP Server設定檔
$ sudo vi /etc/udhcpd.conf # The start and end of the IP lease block start 192.168.1.100 #default: 192.168.0.20 end 192.168.1.254 #default: 192.168.0.254 # The interface that udhcpd will use interface wlan0 #default: eth0 #Examles opt dns 8.8.8.8 192.168.1.1 option subnet 255.255.255.0 opt router 192.168.1.1 #opt wins 192.168.10.10 #option dns 129.219.13.81 # appened to above DNS servers for a total of 3 #option domain local option lease 864000 # 10 days of seconds啟動DHCP Server服務
$ sudo service udhcpd restart開機時自動啟動DHCP Server服務
$ sudo update-rc.d udhcpd defaults11. 啟動IP Forwarding的功能，將net.ipv4.ip_forward=1拿掉註解
$ sudo vi /etc/sysctl.conf # Uncomment the next line to enable packet forwarding for IPv4 net.ipv4.ip_forward=112. 啟用iptables NAT功能
$ sudo iptables -F $ sudo iptables -F -t nat $ 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儲存目前iptables設定值
$ sudo bash -c 'iptables-save > /etc/network/iptables' $ sudo iptables-restore < /etc/network/iptables設定開機時，讓iptables的規則自動被載入
$ sudo vi /etc/rc.local #!/bin/sh -e # # rc.local # # This script is executed at the end of each multiuser runlevel. # Make sure that the script will "exit 0" on success or any other # value on error. # # In order to enable or disable this script just change the execution # bits. # # By default this script does nothing. # Print the IP address _IP=$(hostname -I) || true if [ "$_IP" ]; then printf "My IP address is %s\n" "$_IP" fi sudo iptables-restore < /etc/network/iptables exit 013. 重新啟動
$ sudo reboot14. 參考來源
RPI-Wireless-Hotspot
Raspberry Pi 的應用 - Wi-Fi 無線基地台
Raspberry Pi 的實作 - 自動配置 IP 位址資訊的 DHCP Server
敗家學習之旅之樹莓派(Raspberry Pi) Realtek WIFI AP 架設成功心得分享
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