參考：Setting up a Raspberry Pi as a routed wireless access point

1.1：安裝hostapd：

sudo apt-get install hostapd
sudo systemctl stop hostapd
sudo systemctl unmask hostapd
sudo systemctl enable hostapd

1.2：配置hostapd：

sudo nano /etc/hostapd/hostapd.conf

加入以下：

country_code=CN
interface=wlan0
ssid=RaspberryPi    #網絡名稱
hw_mode=g    #a = IEEE 802.11a (5 GHz)；b = IEEE 802.11b (2.4 GHz)；g = IEEE 802.11g (2.4 GHz)；ad = IEEE 802.11ad (60 GHz) 
channel=7
wmm_enabled=0
macaddr_acl=0
auth_algs=1
ignore_broadcast_ssid=0
wpa=2
wpa_passphrase=12345678    #密碼
wpa_key_mgmt=WPA-PSK
wpa_pairwise=TKIP
rsn_pairwise=CCMP

sudo nano /etc/default/hostapd

在最後添加：

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

sudo systemctl start hostapd

2.1：安裝dnsmasq：

sudo apt-get install dnsmasq
sudo systemctl stop dnsmasq

2.2：配置dnsmasq：

sudo nano /etc/dnsmasq.conf

interface=wlan0
dhcp-range=192.168.4.2,192.168.4.255,255.255.255.0,24h
dhcp-host=f0:7b:cb:a2:4d:54,192.168.4.2
dhcp-host=00:0c:29:99:f7:c6,192.168.4.3

sudo systemctl start dnsmasq

3.1：安裝dhcpcd：

sudo apt-get install dhcpcd
sudo systemctl stop dhcpcd

3.2：配置dhcpcd：

sudo nano /etc/dhcpcd.conf

在最後添加：

interface wlan0
    static ip_address=192.168.4.1/24
    nohook wpa_supplicant

sudo rfkill unblock wlan

sudo systemctl start dhcpcd

4：啟用IP轉發：

sudo nano /etc/sysctl.conf

去掉

net.ipv4.ip_forward=1

前面的註釋符號#

sudo sysctl -p

5：配置防火牆規則：

sudo iptables -t nat -A  POSTROUTING -o eth0 -j MASQUERADE

sudo iptables-save > /home/pi/iptables.ipv4.nat

sudo nano /etc/rc.local

把

iptables-restore < /home/pi/iptables.ipv4.nat

加到最後一行

exit 0

的前面。
6:重啓樹莓派：

sudo reboot