Ubuntu: Automatically connect to a wireless network using CLI



Question:

I need my machine to connect to a wireless network automatically every time it starts

I'm running a headless server (10.04) and I use following commands to manually connect to the network

sudo iwconfig wlan0 essid "SSID_Name"  sudo iwconfig wlan0 key XXXXX  sudo iwconfig wlan0 key open  sudo iwconfig wlan0 mode Managed  sudo dhclient wlan0  

I will appreciate if we can do that by modifying etc/network/interfaces file

Please note that my router is running wep, thanks in advance


Solution:1

Please amend your /etc/network/interfaces file to:

auto lo  iface lo inet loopback    auto wlan0  iface wlan0 inet dhcp  wireless-ssid SSID_Name  wireless-key XXXXX  

If you expect to ssh and ftp into the server, you need to know where it is. Do so with a static IP address:

auto lo  iface lo inet loopback    auto wlan0  iface wlan0 inet static  address 192.168.1.150  netmask 255.255.255.0  gateway 192.168.1.1  wireless-ssid SSID_Name  wireless-key XXXXX  dns-nameservers 8.8.8.8 192.168.1.1  

Moreover, your settings imply that your network is encrypted with WEP which is quite insecure. I recommend you change the router to WPA2-AES:

auto lo  iface lo inet loopback    auto wlan0  iface wlan0 inet static  address 192.168.1.150  netmask 255.255.255.0  gateway 192.168.1.1  wpa-essid SSID_Name  wpa-psk XXXXX  dns-nameservers 8.8.8.8 192.168.1.1  

Be sure to select an address outside the range used by the DHCP server in the router and, of course, substitute your details here.


Solution:2

Automatic Wireless Connection when Login

For cases where you would like to login automatically to a wireless router here are the steps:

  1. Open the interface file:

    sudo nano /etc/network/interfaces  
  2. Add the following information (Assuming your interface is called wlan0):

    auto wlan0  iface wlan0 inet static  address ASSIGNED_IP  netmask 255.255.255.0  gateway THE_GATEWAY  wireless-essid YOURSSID  wireless-key WIRELESSKEY_HERE  
  3. Save the file and reboot computer.


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