Setup Guide

Requirements

• Raspberry Pi Model: 3 B
• 16GB minimum SD
• latest version of Raspbian (Link)
• USB Mouse and Keyboard
• HDMI cable for display
• Ethernet cable (CAT5/6)

Procedure

Step 1 - Install packages

Run command sudo apt-get install dnsmasq hostapd

Step 2 - Configure interface

Run command sudo nano /etc/dhcpcd.conf

Add lines at bottom of file

`interface wlan0`

`static ip_address=172.24.1.1/24`

**Run command** `sudo nano /etc/network/interfaces`

**Add lines at bottom of file** (add/edit lines below after “allow-hotplug wlan0”)

`iface wlan0 inet static`

`address 172.24.1.1`

`netmask 255.255.255.0`

**Comment out the existing line to match below**

`# wpa-conf /etc/wpa_supplicant/wpa-supplicant.conf`

**Run command** `sudo service dhcpcd restart`

**Run command** `ifconfig`

Confirm wlan0 now has a static ip of 172.24.1.1

## Step 3 - Configure hostapd **Run command** `sudo nano /etc/hostapd/hostapd.conf`

Add lines below to the file

`interface=wlan0`

`driver=nl80211`

`ssid=”enter what you want SSID to be”`

`hw_mode=g`

`channel=1`

`macaddr_acl=0`

`auth_algs=1`

`ignore_broadcast_ssid=0`

`wpa=2`

`wpa_key_mgmt=WPA-PSK`

`wpa_passphrase=”what you want password to be”`

`wpa_pairwise=CCMP`

`rsn_pairwise=CCMP`

**Run command** `sudo /usr/sbin/hostapd /etc/hostapd/hostapd.conf`

You should now see the SSID being broardcasst as a hotspot, use Ctrl+C to stop this action

## Step 4 - Run hostapd config at boot **Run command** `sudo nano /etc/default/hostapd`

**Un-comment and change to match the following line** `DAEMON_CONF=”/etc/hostapd/hostapd.conf”`

## Step 5 - Configure dnsmasq **Run command** `sudo mv /etc/dnsmasq.conf /etc/dnsmasq.conf.orig` **Run command** `sudo nano /etc/dnsmasq.conf`

**Add lines below to the file**

`interface=wlan0`

`bind-interfaces`

`server=8.8.8.8`

`domain-needed`

`bogus-priv`

`dhcp-range=172.24.1.50,172.24.1.150,12h`

## Step 6 - Setup ipv4 forwarding **Run command** `sudo nano /etc/sysctl.conf` **Un-comment and change to match the following line**

`net.ipv4.ip_forward=1 and save`

**Run command** `sudo sh –c “echo 1 > /proc/sys/net/ipv4/ip_forward”`

## Step 7 - NAT between eth0 and wlan0 **Run command** `sudo iptables –t nat –A POSTROUTING –o eth0 –j MASQUERADE`

**Run command** `sudo iptables –A FORWARD –i eth0 –o wlan0 –m state -- state RELATED,ESTABLISHED –j ACCEPT`

**Run command** `sudo iptables –A FORWARD -i wlan0 –o eth0 –j ACCEPT`

### Confirm configuration **Run command** `sudo iptables –t nat –S` (output should match below)

`-P PREROUTING ACCEPT`

`-P INPUT ACCEPT`

`-P OUTPUT ACCEPT`

`-P POSTROUTING ACCEPT`

`-A POSTROUTING –o eth0 –j MASQUERADE`

**Run command** `sudo iptables –S` (output should match below)

`-P INPUT ACCEPT`

`-P FORWARD ACCEPT`

`-P OUTPUT ACCEPT`

`-A FORWARD –i eth0 –o wlan0 –m state --state RELATED,ESTABLISHED –j ACCEPT`

`-A FORWARD –i wlan0 –o eth0 –j ACCEPT`

## Step 8 - Apply NAT rules and apply to DHCP at boot **Run command** `sudo sh –c “iptables-save > /etc/iptables.ipv4.nat”`

**Run command** `sudo nano /lib/dhcpcd/dhcpcd-hooks/70-ipv4-nat`

**Add lines below to the file**

`iptables-restore < /etc/iptables.ipv4.nat`

### Confirm configuration **Run command** `sudo service hostapd start`

**Run command** `sudo service dnsmasq start`

**Reboot if needed and connect to SSID**