1. 采购硬件

  • 树莓派（去年买的Raspberry Pi 2 Model B 1GB 一直吃灰，不能忍）
  • USB无线网卡(购买链接：http://item.jd.com/509932.html)，新版树莓派3自带无线模块，应该无需购买
  • 选用设备
    • 网线（方便调试）

2. 装树莓派官方系统，更新，基础配置

  • 略（不会配置，找个文档看看）

3. 安装 hostapd + udhcpd

apt-get install -y hostapd udhcpd

  • udhcpd 配置

      root@raspberrypi:~# cat /etc/udhcpd.conf
  start 192.168.42.2 # This is the range of IPs that the hostspot will give to client devices.
  end 192.168.42.20
  interface wlan0 # The device uDHCP listens on.
  remaining yes
  #opt dns 8.8.8.8 4.2.2.2 # The DNS servers client devices will use.
  opt dns 223.5.5.5 223.6.6.6 # The DNS servers client devices will use.
  opt subnet 255.255.255.0
  opt router 192.168.42.1 # The Pi's IP address on wlan0 which we will set up shortly.
  opt lease 864000 # 10 day DHCP lease time in seconds

  • hostapd 配置

    • 注意driver=rtl871xdrv 不是nl80211，因为奶茶东的usb网卡硬件不一样（rtl8192cu）
    • 替换/usr/sbin/hostapd这个二进制文件（外国友人链接：https://dl.dropboxusercontent.com/u/1663660/hostapd/hostapd）

    因为硬件的适配性问题，默默调试了3-4h，各种搜（树莓派3应该不存在这种问题）

      root@raspberrypi:~# lsusb |grep WLAN
  		Bus 001 Device 004: ID 0bda:8176 Realtek Semiconductor Corp. RTL8188CUS 802.11n WLAN Adapter

  root@raspberrypi:~# lshw -C network
  *-network:0
     description: Wireless interface
     physical id: 1
     bus info: usb@1:1.3
     logical name: wlan0
     serial: e8:4e:06:2a:5e:73
     capabilities: ethernet physical wireless
     configuration: broadcast=yes driver= rtl8192cu ip=192.168.42.1 multicast=yes wireless=IEEE 802.11bg

hostapd配置

	root@raspberrypi:~# cat /etc/hostapd/hostapd.conf
	interface=wlan0
	driver=rtl871xdrv
	ssid=行者孙
	hw_mode=g
	channel=6
	macaddr_acl=0
	auth_algs=1
	ignore_broadcast_ssid=0
	wpa=2
	wpa_passphrase=haha1234
	wpa_key_mgmt=WPA-PSK
	wpa_pairwise=TKIP
	rsn_pairwise=CCMP

4. 内核 iptable 网络 配置 启动项

  • 内核

      root@raspberrypi:~# grep net.ipv4.ip_forward=1 /etc/sysctl.conf
  net.ipv4.ip_forward=1

  • iptables

      root@raspberrypi:~# cat /etc/iptables.ipv4.nat
  # Generated by iptables-save v1.4.14 on Sat Apr 30 16:59:41 2016
  *filter
  :INPUT ACCEPT [23:1360]
  :FORWARD ACCEPT [0:0]
  :OUTPUT ACCEPT [21:3136]
  -A FORWARD -i eth0 -o wlan0 -m state --state RELATED,ESTABLISHED -j ACCEPT
  -A FORWARD -i wlan0 -o eth0 -j ACCEPT
  COMMIT
  # Completed on Sat Apr 30 16:59:41 2016
  # Generated by iptables-save v1.4.14 on Sat Apr 30 16:59:41 2016
  *nat
  :PREROUTING ACCEPT [2:156]
  :INPUT ACCEPT [2:156]
  :OUTPUT ACCEPT [1:108]
  :POSTROUTING ACCEPT [0:0]
  -A POSTROUTING -o eth0 -j MASQUERADE
  COMMIT
  # Completed on Sat Apr 30 16:59:41 2016

  • 网络配置

      root@raspberrypi:~# cat /etc/network/interfaces
  auto lo
  iface lo inet loopback
  iface eth0 inet dhcp

  auto eth0
  allow-hotplug eth0

  auto wlan0
  allow-hotplug wlan0
  iface wlan0 inet static
    address 192.168.42.1
    netmask 255.255.255.0

  pre-up iptables-restore < /etc/iptables.ipv4.nat

  • 启动项

      root@raspberrypi:~# history | grep enable
    103  update-rc.d udhcpd enable
    104  update-rc.d hostapd enable

4. 手机电脑连接测试，效果感人

测试速度很快。主观自我肯定，客观硬件配置的确秒杀绝大部分路由器

ssid：行者孙
password: haha1234

5. 总结

Hi, GNU/linux 陪伴是最长情的告白，等我财务自由了我赚钱给你！

  • 消灭没有女朋友的无聊的人山人海的五一假期
  • 拥有一个自由控制的linux router
  • 自我陶醉
  • 物尽所用