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Ubuntu wireless Network Setup

Router In Computer Network / February 4, 2021

How To Configure Wireless / WiFi Networking in Ubuntu via the Command Line (CLI)

25 06 2010

I did this on a minimal install of Ubuntu Lucid, so it is as up-to-date as possible. The PC I was using has no Windows Manager of Graphical Display Manager, just the good old terminal so all this is done via the CLI only. I did this using a USB WiFI dongle, but it should be the same whether you use an internal card or a USB card.

First, you need to install the relevant software. You need to have a wired connection at this point, otherwise this wont work.

sudo apt-get install wireless-tools wpasupplicant

If you are connecting to an open network, you wont need wpasupplicant. Next, you need to “bring up” (essentially this means activate) your WiFi interface. So, issue:

sudo ifconfig wlan0 up

Next, to make sure your wireless device is working as it should issue:

iwconfig
and then
sudo iwlist scan

This should show you some wireless networks as proof that the WiFi device is working, if something goes wrong here, then there is a problem with your device or driver and you need to get googling.

If you are accessing a secured network and you really should be, you need to access the correct version of your WiFi key. To get your key, issue this command:

wpa_passphrase YOURSSID YOURWIFIPASSWORD

This will result in something that looks like this:

network={
ssid="YOURSSID"
#psk="YOURWIFIPASSWORD"
psk=fe727aa8b64ac9b3f54c72432da14faed933ea511ecab1 5bbc6c52e7522f709a
}

You need to make a note of the long phrase after psk= (NOT #psk=) as this your WiFi password in hex format.

Next, you need to edit your interfaces file, so issue:

sudo nano /etc/network/interfaces

At the end of this file, you need to add your WiFi configuration. Here are the options you can add.

auto wlan0 #change this to the name of your WiFi interface
iface wlan0 inet dhcp #this is normally fine, if you want a static IP address replace “dhcp” with “static”
netmask 255.255.255.0 #change this as appropriate for your network, this value is usually right
gateway 192.168.1.1 #change this as appropriate for your network
address 192.168.1.100 #only needed for a static IP address
dns-nameservers 192.168.1.1 #only needed for a static IP address
wpa-driver wext #you shouldn’t need to change this
wpa-ssid YOURSSID #just type the name of your SSID here
wpa-ap-scan 1 #if the name of your SSID is hidden usually, type 2 instead of 1
wpa-proto WPA #if you use WPA1 type WPA, if you use WPA2 type RSN
wpa-pairwise CCMP #if you use AES type CCMP, if you use TKIP type TKIP
wpa-group CCMP #if you use AES type CCMP, if you use TKIP type TKIP
wpa-key-mgmt WPA-PSK #usually WPA-PSK (if you share a key) but sometimes WPA-EAP (for enterprises)
wpa-psk YOURHEXKEYFROMABOVE #the hex key that you generated earlier

Thus, since I am using a WiFi card that is identified as wlan0 and am connecting to a WPA1 AES encrypted network called MYPLACE that isn’t hidden without a static IP address, this is what I added:

auto wlan0
iface wlan0 inet dhcp
netmask 255.255.255.0
gateway 192.168.1.1
wpa-driver wext
wpa-ssid MYPLACE
wpa-ap-scan 1
wpa-proto WPA
wpa-pairwise CCMP
wpa-group CCMP
wpa-key-mgmt WPA-PSK
wpa-psk 73ae7bb1243141e5caa7b6bb0e2d7eetcetcetc

Finally, comment out the top section so it looks like this:

Source: prupert.wordpress.com