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rpi3-wifi-station-ap-stretch

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Version that works for Stretch

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Download Latest Version (.zip)

README.md

# Installation Guide

1. Get the code

git clone https://github.com/peebles/rpi3-wifi-station-ap-stretch

Downloads the entire project code from GitHub to your computer.

cd rpi3-wifi-station-ap-stretch

Moves into the project folder you just downloaded.

2. Official Install Script

Easy Recommended

Prerequisites

APT (Debian/Ubuntu 계열) Built into Debian/Ubuntu-based Linux distributions.

apt-get install -y hostapd dnsmasq iptables-persistent

Installs directly from the APT package repository (Debian/Ubuntu-based).

✅ After installing, open a new terminal and run the program's version command (e.g. --version) to confirm it worked.

Pulled directly from this repo's README.

// repository documentation

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# RASPBERRY PI 3 - WIFI STATION+AP

Running the Raspberry Pi 3 as a Wifi client (station) and access point (ap) from the single built-in wifi.

Its been written about before, but this way is better.  The access point device is created before networking
starts (using udev) and there is no need to run anything from `/etc/rc.local`.  No reboot, no scripts.

## Use Cases

The Rpi 3 wifi chipset can support running an access point and a station function simultaneously.  One
use case is a device that connects to the cloud (the station, via a user's home wifi network) but
that needs an admin interface (the access point) to configure the network.  The user powers on the
device, then logs into the access point using a specified SSID/password.  The user runs a browser
and connects to the access point IP address (or hostname), which is running a web server to configure
the station network (the user's wifi).

Another use case might be to create a guest interface to your home wifi.  You can configure the client
side with your wifi particulars, then configure the access point with a password you can give out to your
guests.  When the party's over, change the access point password.

## /etc/network/interfaces.d/ap

allow-hotplug uap0
    auto uap0
    iface uap0 inet static
        address 10.3.141.1
        netmask 255.255.255.0

## /etc/udev/rules.d/90-wireless.rules

ACTION=="add", SUBSYSTEM=="ieee80211", KERNEL=="phy0", \
        RUN+="/sbin/iw phy %k interface add uap0 type __ap"

## /lib/dhcpcd/dhcpcd-hooks/10-wpa_supplicant

```sh
if [ -z "$wpa_supplicant_conf" ]; then
	for x in \
		/etc/wpa_supplicant/wpa_supplicant-"$interface".conf \
		/etc/wpa_supplicant/wpa_supplicant.conf \
		/etc/wpa_supplicant-"$interface".conf \
		/etc/wpa_supplicant.conf \
	; do
		if [ -s "$x" ]; then
			wpa_supplicant_conf="$x"
			break
		fi
	done
fi
: ${wpa_supplicant_conf:=/etc/wpa_supplicant.conf}

if [ "$ifwireless" = "1" ] && \
    type wpa_supplicant >/dev/null 2>&1 && \
    type wpa_cli >/dev/null 2>&1
then
	if [ "$reason" = "IPV4LL" ]; then
		wpa_supplicant -B -iwlan0 -f/var/log/wpa_supplicant.log -c/etc/wpa_supplicant/wpa_supplicant.conf
	fi
fi
```

## Set up the client wifi (station) on wlan0.

Create `/etc/wpa_supplicant/wpa_supplicant.conf`.  The contents depend on whether your home network is open, WEP or WPA.  It is
probably WPA, and so should look like:

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
    country=US
    
    network={
	    ssid="_ST_SSID_"
	    psk="_ST_PASSWORD_"
	    key_mgmt=WPA-PSK
    }

Replace `_ST_SSID_` with your home network SSID and `_ST_PASSWORD_` with your wifi password (in clear text).
	
## Install the packages you need for DNS, Access Point and Firewall rules.

apt-get update
	apt-get install -y hostapd dnsmasq iptables-persistent

## /etc/dnsmasq.conf

interface=lo,uap0
    no-dhcp-interface=lo,wlan0
    bind-interfaces
    server=8.8.8.8
    dhcp-range=10.3.141.50,10.3.141.255,12h

## /etc/hostapd/hostapd.conf

interface=uap0
    ssid=_AP_SSID_
    hw_mode=g
    channel=6
    macaddr_acl=0
    auth_algs=1
    ignore_broadcast_ssid=0
    wpa=2
    wpa_passphrase=_AP_PASSWORD_
    wpa_key_mgmt=WPA-PSK
    wpa_pairwise=TKIP
    rsn_pairwise=CCMP

Replace `_AP_SSID_` with the SSID you want for your access point.  Replace `_AP_PASSWORD_` with the password for your access point.  Make sure it has
enough characters to be a legal password!  (8 characters minimum).

## /etc/default/hostapd

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

## Bridge AP to cient side

This is optional.  If you do this step, then someone connected to the AP side can browse the internet through the client side.

echo "net.ipv4.ip_forward=1" >> /etc/sysctl.conf
    echo 1 > /proc/sys/net/ipv4/ip_forward
	iptables -t nat -A POSTROUTING -s 10.3.141.0/24 ! -d 10.3.141.0/24 -j MASQUERADE
    iptables-save > /etc/iptables/rules.v4

## REBOOT!

reboot