This quide is using the IP 192.168.69.2 for the WiFi hotspot, and the IP 10.94.65.230 for LAN.
Please change these IPs to fit your network.
Update & Upgrade the PI
sudo apt-get update
sudo apt-get upgrade
Install DHCPD and HOSTAPD
sudo apt-get install dnsmasq hostapd
Stop the newly added services while thay are configured
sudo systemctl stop dnsmasq
sudo systemctl stop hostapd
Configure the static IP addresses for eth0 and wlan0
sudo nano /etc/dhcpcd.conf
Add to the end of the file:
# Configure eth0 for LAN
interface eth0
static ip_address=10.94.65.230/24
static domain_name_servers=192.168.0.1 8.8.8.8
static routers=10.94.65.254
# Disable wlan0 so HOSTAPD can start
denyinterfaces wlan0
Restart the DHCPCD service to apply the changes
sudo service dhcpcd restart
Configure the range of IPs the server will issue out
sudo nano /etc/dnsmasq.conf
Add to the end of the file:
interface=wlan0
dhcp-range=192.168.69.2,192.168.69.22,255.255.255.0,24h
Configuring the WiFi hotspot with HOSTAPD
sudo nano /etc/hostapd/hostapd.conf
Add to the end of the file:
interface=wlan0
driver=nl80211
ssid=Patkis-Air
hw_mode=g
channel=7
ieee80211n=1
wmm_enabled=1
macaddr_acl=0
auth_algs=1
ignore_broadcast_ssid=0
wpa=2
wpa_passphrase=patkis1234
wpa_key_mgmt=WPA-PSK
wpa_pairwise=TKIP
rsn_pairwise=CCMP
Next we need to tell HOSTAPD where the configuration file is
sudo nano /etc/default/hostapd
Find the DAEMON_CONF file and change it to this:
DAEMON_CONF="/etc/hostapd/hostapd.conf"
Now we can start the services back up
sudo systemctl start hostapd
sudo systemctl start dnsmasq
We will make out WiFi requests route to the LAN network
sudo nano /etc/sysctl.conf
Uncomment this line:
net.ipv4.ip_forward=1
Add a masquerade for outbound traffic on eth0:
sudo iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
Save the iptables rule:
sudo sh -c "iptables-save > /etc/iptables.ipv4.nat"
Make these rules apply on boot:
sudo nano /etc/rc.local
Add this right before the exit 0 line:
iptables-restore < /etc/iptables.ipv4.nat
ifconfig wlan0 192.168.69.2
service dhcpd restart
sudo reboot