RPI Wireless-Access-Point

aspberry-pi3-作为无线路由接入点">将Raspberry Pi3 作为无线路由接入点

Install the necessary software.

$ sudo apt-get install hostapd udhcpd

Configure DHCP /etc/udhcpd.conf

$ sudo nano /etc/udhcpd.conf

// 将文件修为为如下内容：

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 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

Edit the file /etc/default/udhcpd and change the line:

DHCPD_ENABLED="no"

to

#DHCPD_ENABLED="no"

Configure Network

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

Change the lines (they probably won’t all be next to each other):

wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf
iface default inet manual

to

#wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf


#iface default inet dhcp

/etc/network/interfaces like this:

# 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 192.168.52.1
    netmask 255.255.255.0
    gateway 192.168.52.1
    network 192.168.52.0
    broadcast 192.168.52.255
    dns-nameservers 192.168.52.1 8.8.8.8 8.8.4.4


#iface wlan0 inet manual


#   wpa-conf /etc/wpa_supplicantwpa_supplicant.conf



#allow-hotplug wlan1


#iface wlan1 inet manual


#    wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf


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

Configure HostAPD. edit the file /etc/hostapd/hostapd.conf (create it if it doesn’t exist) and add the following lines:

A secure network

interface=wlan0
driver=nl80211
ssid=My_AP
hw_mode=g
channel=6
macaddr_acl=0
auth_algs=1
ignore_broadcast_ssid=0
wpa=2
wpa_passphrase=My_Password
wpa_key_mgmt=WPA-PSK

#wpa_pairwise=TKIP  # You better do not use this weak encryption (only used by old client devices)

rsn_pairwise=CCMP

A open network

interface=wlan0
ssid=My_AP
hw_mode=g
channel=6
auth_algs=1
wmm_enabled=0

If Raspberry Pi 3 add this parameters:

ieee80211n=1          # 802.11n support
wmm_enabled=1         # QoS support
ht_capab=[HT40][SHORT-GI-20][DSSS_CCK-40]

Edit the file /etc/default/hostapd and change the line:

#DAEMON_CONF=""

to

DAEMON_CONF="/etc/hostapd/hostapd.conf"

Configure NAT (Network Address Translation). NAT is a technique that allows several devices to use a single connection to the internet. Linux supports NAT using Netfilter (also known as iptables) and is fairly easy to set up. First, enable IP forwarding in the kernel:

sudo sh -c "echo 1 > /proc/sys/net/ipv4/ip_forward"

To set this up automatically on boot, edit the file /etc/sysctl.conf and add the following line to the bottom of the file:

net.ipv4.ip_forward=1

To enable NAT in the kernel, run the following commands:

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

These instructions don’t give a good solution for rerouting https and for URLs referring to a page inside a domain, like www.nu.nl/38274.htm. The user will see a 404 error. Your Pi is now NAT-ing. To make this permanent so you don’t have to run the commands after each reboot, run the following command:

sudo sh -c "iptables-save > /etc/iptables.ipv4.nat"

Now edit the file /etc/network/interfaces and add the following line to the bottom of the file:

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

Fire it Up!

sudo service hostapd start
sudo service udhcpd start

Your Pi should now be hosting a wireless hotspot. To get the hotspot to start on boot, run these additional commands:

sudo update-rc.d hostapd enable
sudo update-rc.d udhcpd enable

本文参考RPI-Wireless-Hotspot,在其基础之上网络配置部分稍作调整，在Raspberry Debian 8 上运行没有问题！