Category:RaspberryPi

Autoboot the wlan0 wireless lan interface

root@raspberrypi:/# cat /etc/network/interfaces 
auto lo


iface lo inet loopback
iface eth0 inet dhcp


#iface wlan0 inet manual
#wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf
autp wlan0
allow-hotplug wlan0
iface wlan0 inet dhcp
wpa-ssid "<SSID>"
wpa-psk "<PASSPHRASE>"


iface default inet dhcp

Assign a fixed IP address

Get the current IP address and other info

ifconfig -a

We're interested in these bits:

wlan0
          inet addr:192.168.1.15  Bcast:192.168.1.255  Mask:255.255.255.0

Get the router/gateway address

netstan -rn

We're interested in these bits:

Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
0.0.0.0         192.168.1.1     0.0.0.0         UG        0 0          0 wlan0

Now edit /etc/network/interfaces and replace the 'dhcp' with 'static' for the required interface

address 192.168.1.100
netmask 255.255.255.0
network 192.168.1.0
broadcast 192.168.1.255
gateway 192.168.1.1

The interface section ends up looking something like this...

auto wlan0
allow-hotplug wlan0
iface wlan0 inet static
address 192.168.1.100
netmask 255.255.255.0
network 192.168.1.0
broadcast 192.168.1.255
gateway 192.168.1.1
wpa-ssid "<SSID>"
wpa-psk "<PASSPHRASE>"