https:\/\/frillip.com\/using-your-raspberry-pi-3-as-a-wifi-access-point-with-hostapd\/<\/a>
You should follow that guide, we’ve just duplicated here for our needs in case it ever vanishes.<\/p>\n\n\n\nInstalling The Required Packages<\/h5>\n\n\n\n
hostapd<\/p>\n\n\n\n
Let you to use the built in WiFi as an access point.<\/p>\n\n\n\n
dnsmasq<\/p>\n\n\n\n
A combined DHCP and DNS server that’s easy to configure (less heavyweight than isc-dhcp-server and bind9)<\/p>\n\n\n\n
sudo apt-get install dnsmasq hostapd<\/code><\/pre>\n\n\n\nConfiguring Raspbian DHCP<\/h5>\n\n\n\n
In Raspian interface configuration is handled by dhcpcd. We need to tell it to ignore wlan0, as we will be configuring it with a static IP address elsewhere.<\/p>\n\n\n\n
Open up the dhcpcd configuration file:<\/p>\n\n\n\n
sudo nano \/etc\/dhcpcd.conf<\/code><\/pre>\n\n\n\nAdd the following to the bottom of the file (but above any interface lines you may have added):<\/p>\n\n\n\n
#DISABLE WLAN0 FROM DHCPCD AS WE ARE USING IT AS A WIFI ACCESS POINT\ndenyinterfaces wlan0 <\/code><\/pre>\n\n\n\nSet WLAN0 static IP Address<\/h5>\n\n\n\n
Open up the interface configuration file:<\/p>\n\n\n\n
sudo nano \/etc\/network\/interfaces<\/code><\/pre>\n\n\n\nEdit the wlan0 section so that it looks like this:<\/p>\n\n\n\n
allow-hotplug wlan0\niface wlan0 inet static\n wireless-mode Master\n address 192.168.0.1\n netmask 255.255.255.0\n network 192.168.0.0\n broadcast 192.168.0.255\n# wpa-conf \/etc\/wpa_supplicant\/wpa_supplicant.conf<\/code><\/pre>\n\n\n\nN.B. Make sure the subnet is different from the subnet you are using on your eth0 connection if you are connecting via SSH, otherwise you’ll loose your connection on eth0!!<\/em><\/strong><\/p>\n\n\n\nRestart dhcpcd and then reload the configuration for wlan0 with:<\/p>\n\n\n\n
sudo service dhcpcd restart\n\nsudo ifdown wlan0; sudo ifup wlan0<\/code><\/pre>\n\n\n\nConfigure Hostapd<\/h5>\n\n\n\n
Create a new configuration file:<\/p>\n\n\n\n
sudo nano \/etc\/hostapd\/hostapd.conf<\/code><\/pre>\n\n\n\nCopy this into the file:<\/p>\n\n\n\n
interface=wlan0\n\n# Use the nl80211 driver with the brcmfmac driver\ndriver=nl80211\n\n# The name to use for the network\nssid=RPi-AP\n\n# Use the 2.4GHz band\nhw_mode=g\n\n# Use channel 6\nchannel=6\n\n# Enable 802.11n\nieee80211n=1\n\n# Enable WMM\nwmm_enabled=1\n\n# Enable 40MHz channels with 20ns guard interval\nht_capab=[HT40][SHORT-GI-20][DSSS_CCK-40]\n\n# Accept all MAC addresses\nmacaddr_acl=0\n\n# Use WPA authentication\nauth_algs=1\n\n# Broadcast the network name\nignore_broadcast_ssid=0\n\n# Use WPA2\nwpa=2\n\n# Use a pre-shared key\nwpa_key_mgmt=WPA-PSK\n\n# The WPA2 passphrase (password)\nwpa_passphrase=raspberry\n\n# Use AES, instead of TKIP\nrsn_pairwise=CCMP<\/code><\/pre>\n\n\n\nSave and exit.<\/p>\n\n\n\n
To verify its working by entering this and checking you see network “RPi3-AP”<\/p>\n\n\n\n
sudo \/usr\/sbin\/hostapd \/etc\/hostapd\/hostapd.conf<\/code><\/pre>\n\n\n\nUse Ctrl+C to stop it.<\/p>\n\n\n\n
If you tried connecting to it, you would see some output from the Pi, but you won’t receive an IP address until dnsmasq is set up.<\/p>\n\n\n\n
We need to tell hostapd where to look for the config file when it starts up on boot. Open up the default configuration file:<\/p>\n\n\n\n
sudo nano \/etc\/default\/hostapd<\/code><\/pre>\n\n\n\nfind the line<\/p>\n\n\n\n
#DAEMON_CONF=\"\"<\/code><\/pre>\n\n\n\nand replace it with:<\/p>\n\n\n\n
DAEMON_CONF=\"\/etc\/hostapd\/hostapd.conf\"<\/code><\/pre>\n\n\n\nNote: “_CONF”, NOT “#DAEMON_OPTS”!!! REMOVE THE ‘#’ AT THE START OF THE LINE!!!!<\/p>\n\n\n\n
Configure DNSMASQ<\/h5>\n\n\n\n
The default dnsmasq config file contains lots of information on how to use it, but the majority of it is largely redundant for our purposes. So to simplify things we move it and then create a new one:<\/p>\n\n\n\n
sudo mv \/etc\/dnsmasq.conf \/etc\/dnsmasq.conf.orig\nsudo nano \/etc\/dnsmasq.conf<\/code><\/pre>\n\n\n\nCopy in the following:<\/p>\n\n\n\n
# Use interface wlan0\ninterface=wlan0\n\n# Explicitly specify the address to listen on\nlisten-address=192.168.0.1\n\n# Bind to the interface to make sure we aren't sending things elsewhere\nbind-interfaces\n\n# Forward DNS requests to Google DNS\nserver=8.8.8.8\n\n# Don't forward short names\ndomain-needed\n\n# Never forward addresses in the non-routed address spaces.\nbogus-priv\n\n# Assign IP addresses between 192.168.0.5 and 192.168.0.250 with a 12 hour lease time\ndhcp-range=192.168.0.5,192.168.0.250,12h<\/code><\/pre>\n\n\n\nSet Up IPv4 Forwarding<\/h5>\n\n\n\n
We need to enable packet forwarding. Open up the sysctl.conf file:<\/p>\n\n\n\n
sudo nano \/etc\/sysctl.conf<\/code><\/pre>\n\n\n\nRemove the # from the beginning of the line containing:<\/p>\n\n\n\n
net.ipv4.ip_forward=1<\/code><\/pre>\n\n\n\nSave and exit. This will enable it on the next reboot. You can activate it immediately with:<\/p>\n\n\n\n
sudo sh -c \"echo 1 > \/proc\/sys\/net\/ipv4\/ip_forward\"<\/code><\/pre>\n\n\n\nTo share our eth0 internet connection to devices connected over WiFi we need to configure a NAT between our wlan0 interface and our eth0 interface. Use the following commands:<\/p>\n\n\n\n
sudo iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE\nsudo iptables -A FORWARD -i eth0 -o wlan0 -m state --state RELATED,ESTABLISHED -j ACCEPT\nsudo iptables -A FORWARD -i wlan0 -o eth0 -j ACCEPT<\/code><\/pre>\n\n\n\nWe need these rules to be applied every time we reboot so run:<\/p>\n\n\n\n
sudo sh -c \"iptables-save > \/etc\/iptables.ipv4.nat\"<\/code><\/pre>\n\n\n\nto save the rules to the file \/etc\/iptables.ipv4.nat. We need to run this after each reboot, so open the rc.local file with:<\/p>\n\n\n\n
sudo nano \/etc\/rc.local<\/code><\/pre>\n\n\n\nJust above the line exit 0, add the following:<\/p>\n\n\n\n
# Special for using wlan0 as an access point\niptables-restore < \/etc\/iptables.ipv4.nat <\/code><\/pre>\n\n\n\n