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Posted 25 May 2014

Creating a Wireless Router / Access Point with #raspberrypi and #raspbian #linux

, 25 May 2014
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How to create a wireless router/access point with #raspberrypi and #raspbian #linux

What about creating my own low powered development network infrastructure at home? Sounds like a good idea, right? You can hack the router settings, creating vlans, control your network traffic, ...

Other reason is to create an abstraction layer between your ISP router and your physical network that can be moved when you move to your shinny new flat!

Let's get to business then. The router hardware is composed by a raspberry PI model A and a USB WiFi (802.11b/g/n) Module with Antenna for Raspberry. The raspberry was configured to boot from a 4gb USB pen drive with a swap partition and the /tmp size was increased (instructions).

My router is using network and my internal network

First of all, install the software:

sudo apt-get install hostapd bind9 isc-dhcp-server ntpdate

This will install AP, DNS, DHCP and NTP support.

Now you need to configure the following files (click on each title to see the configuration!):


Configure the network interfaces.


Configure the firewall, NAT, and forwarding rules.


The dhcp server configuration allows the dynamic dns update, meaning that the hostname of the dhcp client is added to the dns.

You can also configure DHCP to only listen to the wireless device.

> sudo vim /etc/default/isc-dhcp-server

To enable logging, you also need to:

> sudo vim /etc/rsyslog.conf

# add the line

local7.* /var/log/dhcpd.log


Be sure you also run:

# Enable dynamic dns

> sudo chown bind /etc/bind/


Enables the wireless access point.

Sync Boot

Lastly, you need to disable the services from boot. This is because the raspberry don't have a battery and then it doesn't save the system date which causes DNS and DHCP to fail.

We need to sync the initialisation of the raspberry to first get the date from NTP servers and then initialise the router services.

sudo update-rc.d hostapd remove
sudo update-rc.d bind remove
sudo update-rc.d isc-dhcp-server remove
sudo update-rc.d ntp remove

Now, we create the boot script to initialise all:

sudo update-rc.d init-router defaults
sudo update-rc.d init-router enable


I'm very happy with the raspberry performance. I did not notice any significant decrease on network speed. My next step is to configure vlan support and dynamic dns support to be able to access when I'm away from home.

Also, I'll fiddle a little around the iptables rules to have full network control.

If you have any problems or suggestions regarding this post, you can always contact me.

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This article, along with any associated source code and files, is licensed under The MIT License


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