Manual Wireless Association

Revision as of 02:58, 22 September 2011 by Quozl (talk | contribs)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search

Testing Wireless Connectivity

It's sometimes useful to test out manual connections to access points to help us debug the driver and wireless networking software. First test with plain 'iwconfig' tools, then with 'wpa_supplicant'. WPA and WPA2 are supported since build 656.

Scan for Access Point with iwlist

To find an access point, use these commands in Terminal:

su -l
iwlist eth0 scanning

Manual wireless association wizard

If you want to use a command-line wizard:

Run the following in the terminal (that's a L, not a 1!):

su -l 
cd /usr/local/bin/
chmod +x

Then, type "" from the terminal (in the future, only run the following:)

su -l

The wizard will guide you through. Please report all bugs in trac.

Step-by-Step with iwconfig

  • Switch to a Console
  • Log in as user 'root'
  • Stop NetworkManager and network scripts
service NetworkManager stop
service network stop
  • Use iwconfig to connect, replacing the 'essid' and key as necessary
iwconfig eth0 essid "my-ssid"

or for WEP:

iwconfig eth0 essid "my-ssid" key aaffbbcc667788112233449900

and for apple airport (white UFO) use

iwconfig eth0 essid "Network Name" key s:YourKey

If you need to also specify your access point, you can do so with the "ap" option:

iwconfig eth0 essid "my-ssid" key aaffbbcc667788112233449900 ap 0A:1B:2C:3D:4E:5F

If you want to connect to an ad-hoc-network, use the mode-option:

iwconfig eth0 mode Ad-Hoc essid "my-ssid"

For further settings, see man iwconfig.

  • Wait a second or two, then do the following and see if the "Access Point:" and "ESSID" are set to valid values
iwconfig eth0
eth0      IEEE 802.11b  ESSID:"my-ssid"  
          Mode:Managed  Frequency:2.437 GHz  Access Point: 00:20:44:5a:b1:a4   
          Bit Rate:11 Mb/s   Tx-Power=20 dBm   Sensitivity=8/0  
          Retry limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=85/100  Signal level=-45 dBm  Noise level=-82 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:7
  • Wait another 10 seconds or so, and run 'iwconfig' again to ensure the connection is still active
  • Try to acquire network access data from DHCP
/sbin/dhclient -1 eth0
  • Or set the IP-address, default gateway and DNS by hand
ifconfig eth0
route add default gw
echo "nameserver" > /etc/resolv.conf
  • If the "Access Point:" value is still a valid MAC address (ie, it is not all 0s), the connection is still alive
  • Switch back to Sugar (see Console).

Step-by-step with wpa_supplicant

  • Switch to a Console
  • Log in as user 'root'
  • Stop NetworkManager and network scripts
service NetworkManager stop
service network stop
  • Create a wpa_supplicant config file for your network in /etc/wpa_supplicant.conf. It should look something like this:
cat <<EOF > /etc/wpa_supplicant.conf
<press Ctrl+D here>
  • Or for WPA/WPA2 with a pre-shared key (psk):


       ssid="My SSID"
       psk="secret passphrase"
  • Run wpa_supplicant like this:
/usr/sbin/wpa_supplicant -ddd -ieth0 -c/etc/wpa_supplicant.conf -Dwext
  • You should see lines like:
wpa_supplicant[1710]: State: ASSOCIATING -> ASSOCIATED
wpa_supplicant[1710]: Associated to a new BSS: BSSID=00:cc:aa:34:56:12
  • In any case, please copy /var/log/messages and attach it to a bug report
cd /root
cp /var/log/messages wpa_supplicant-log.txt
bzip2 wpa_supplicant-log.txt

Attach the file /root/wpa_supplicant-log.txt.bz2 to the bug.

Configure TCP/IP

To activate the Neighborhood view, in a new Terminal session,

su -l
service network start
ifup eth0
service NetworkManager start