# Raspberry as a standolone Wi-Fi Access Point

A reminder on how to configure a Raspberry Pi 3 (Debian Jessie) as a Wi-Fi Access Point

## Find the Raspberry Pi ethernet ip-address

> Instructions for the macOS platform, little trick to find the raspberry pi ip-address while connected through ethernet.

Connect the Raspberry Pi with an ethernet cable

```sh
$ ifconfig
```

Then look for the `bridge100` interface, and get the inet ipaddress (for me `192.168.2.1`).
You can use nmap to scan for all ips and guess the raspberry pi one.

```sh
$ brew install nmap
$ nmap -n -sP 192.168.2.1/24
```

## Install the dependencies

```sh
$ ssh pi@<ip-address>
pi@raspberrypi:~ $ sudo apt-get install hostapd dnsmasq
```

## /etc/dhcpcd.conf

Configure a static ip profile for the `wlan0` interface. In Debian Jessie, it's done in the `/etc/dhcpcd.conf` configuration file.

```sh
pi@raspberrypi:~ $ cat <<EOT >> /etc/dhcpcd.conf

# define static profile
interface wlan0
static ip_address=192.168.1.23/24
static routers=192.168.1.1
static domain_name_servers=192.168.1.1 8.8.8.8
EOT
```

## /etc/dnsmasq.conf

Configure the Dnsmasq service on the wlan0 interface

```sh
pi@raspberrypi:~ $ sudo mv /etc/dnsmasq.conf /etc/dnsmasq.conf.orig
pi@raspberrypi:~ $ sudo touch /etc/dnsmasq.conf
pi@raspberrypi:~ $ sudo tee <<EOT /etc/dnsmasq.conf >/dev/null
interface=wlan0
domain-needed
bogus-priv
dhcp-range=192.168.1.24,192.168.1.250,12h
EOT
```

## /etc/hostapd.conf

```sh
pi@raspberrypi:~ $ sudo tee <<EOT /etc/hostadp/hostadp.conf >/dev/null
# Interface Settings
interface=wlan0
driver=nl80211

# Wifi AP Settings
ssid=BlackHat
wpa_passphrase=DontTryMe
hw_mode=g
channel=6
ieee80211n=1

# Encryption Settings
auth_algs=1
wpa=2
wpa_key_mgmt=WPA-PSK
wpa_pairwise=TKIP
rsn_pairwise=CCMP

# Accept all MAC addresses
macaddr_acl=0

# Require clients to know the network name
#ignore_broadcast_ssid=0

# Enable WMM (QoS)
wmm_enabled=0

EOT
```

## Forward ipv4 and ipv6

```sh
pi@raspberrypi:~ $ sudo touch /etc/sysctl.d/50-hostapd.conf
pi@raspberrypi:~ $ sudo tee <<EOT /etc/sysctl.d/50-hostapd.conf >/dev/null
net.ipv4.ip_forward=1
net.ipv6.conf.all.forwarding=1
EOT
```

## Restart the services

For an unknown reason (yet), restarting the services is not enough, you should reboot your Raspberry Pi in order to make it work with our new configuration.

```sh
pi@raspberrypi:~ $ sudo reboot
```

Then once it's up and running, you need to check if all services are loaded and running too.

```sh
pi@raspberrypi:~ $ sudo systemctl status dhcpcd.service
pi@raspberrypi:~ $ sudo systemctl status dnsmasq.service
pi@raspberrypi:~ $ sudo systemctl status hostapd.service
```