Setting static ip for your network card
 Edit the file /etc/network/interfaces and add this:

auto wlan0
iface wlan0 inet static
address 10.0.1.1
gateway 10.0.1.1
netmask 255.255.255.0
network 10.0.1.0
broadcast 10.0.1.255

wpa-ssid 'mynetwork'
wpa-psk '12345'

In order for this to take effect the networking service must be restarted
$ sudo /etc/init.d/networking restart


For more info, look here-> https://help.ubuntu.com/community/NetworkConfigurationCommandLine