Aug 102012

Part 1 – How to create a Wireless Network On Your RPi
Part 3 – How to make your RPi into a Router

In this part, we will turn the Raspberry Pi into a Wireless Access point.
All it will do is forward packets from the WiFi adapter to ethernet and vice versa. It will allow you to access your network via WiFi without needing a WiFi router.

To do this, we need to bridge the ethernet and wifi connections, and tell hostapd that we are now using a bridge connection.
In /etc/hostapd/hostapd.conf, we need to add the following line.


Add the following lines into /etc/network/interfaces to define the bridge connection.

#auto br0
iface br0 inet dhcp
bridge_ports eth0 wlan0
pre-up ifconfig eth0 up
pre-up ifconfig wlan0 up
pre-up brctl addbr br0
pre-up brctl addif br0 eth0
post-down ifconfig wlan0 down
post-down ifconfig eth0 down
post-down brctl delif br0 eth0
post-down brctl delbr br0

Notice the “auto br0” is commented out. This is so the bridge does not come up automatically, as once the bridge is up, you will not be able to remotely access the Raspberry Pi until the bridge is brought down or until the bridge gets an IP address.

Once the lines are in /etc/network/interfaces, you can type in ifup br0 as root to bring up the bridge. If you are ssh’ed into the Pi, this will drop your connection.
Once it’s up, the Raspberry Pi will forward anything from the WiFi to ethernet and vice versa.

This let’s the Raspberry Pi act as a Wireless Access Point without any sort of routing. On a WiFi device, you will be able to connect to RaspAP, and it will act is if it was on the network, i.e. it will get an IP address from your normal router.

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