Latest LQ Deal: Complete CCNA, CCNP & Red Hat Certification Training Bundle
Go Back > Forums > Linux Forums > Linux - Networking > Linux - Wireless Networking
User Name
Linux - Wireless Networking This forum is for the discussion of wireless networking in Linux.


  Search this Thread
Old 04-23-2007, 10:50 PM   #1
Feelin' Fine
LQ Newbie
Registered: Feb 2007
Location: Canada
Distribution: Ubuntu 6.10
Posts: 10

Rep: Reputation: 0
Network Manager can't see wireless AP's

Ubuntu 6.10 (edgy). Atheros 0023 chipset (DWA-542 wireless card). Drivers successfully loaded using ndiswrapper. Loaded Network Manager. The wireless card is blinking green (we have a pulse).

The problem is that the wireless card is not seeing any wireless points around me. I know they are there (my own wireless router is 5 feet from the wireless card!).

iwconfig yields:

lo no wireless extensions.

eth0 no wireless extensions.

wlan0 IEEE 802.11g ESSIDff/any
Mode:Managed Frequency:2.412 GHz Access Point: Not-Associated
Bit Rate:54 Mb/s
Power Managementff
Link Quality:0 Signal level:0 Noise level:0
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0

sit0 no wireless extensions.

iwlist scan yields:

lo Interface doesn't support scanning.

eth0 Interface doesn't support scanning.

wlan0 No scan results
sit0 Interface doesn't support scanning.

So....from the above I can conclude that the computer sees the wireless network card, but it can't detect the networks out there.

As I said, I have been running Network Manager. When I right click the icon, it indicates both Enable Networking and Enable Wireless are checked. When I left click, it has a selection for Wired Network, but there are no networks listed for Wireless Networks.

When I try to use NM to manually input a wireless network name and password, NM tries to find the specified network for about 20 seconds, fails to locate one, and falls back to the wired connection.

One more. When I disconnect the hard line and enter sudo dhclient, this is the response that I get.

Listening on LPF/wlan0/00:17:9a:44:9d:3b
Sending on LPF/wlan0/00:17:9a:44:9d:3b
Listening on LPF/eth0/00:09:6b:38:d8:df
Sending on LPF/eth0/00:09:6b:38:d8:df
Sending on Socket/fallback
DHCPREQUEST on eth0 to port 67
DHCPDISCOVER on wlan0 to port 67 interval 5
DHCPDISCOVER on wlan0 to port 67 interval 6
DHCPREQUEST on eth0 to port 67
DHCPDISCOVER on wlan0 to port 67 interval 10
DHCPDISCOVER on eth0 to port 67 interval 8
DHCPDISCOVER on wlan0 to port 67 interval 20
DHCPDISCOVER on eth0 to port 67 interval 8
DHCPDISCOVER on eth0 to port 67 interval 19
DHCPDISCOVER on wlan0 to port 67 interval 11
DHCPDISCOVER on eth0 to port 67 interval 21
DHCPDISCOVER on wlan0 to port 67 interval 9
No DHCPOFFERS received.
No working leases in persistent database - sleeping.

Can anyone make sense of what I have indicated above? I'm sure it's something small and I'm off to the races, but...I'm stumped.

Feelin'....almost there.
Old 04-24-2007, 07:13 AM   #2
LQ Veteran
Registered: Feb 2003
Location: Maryland
Distribution: Slackware
Posts: 7,803
Blog Entries: 1

Rep: Reputation: 416Reputation: 416Reputation: 416Reputation: 416Reputation: 416
A few things to think about:

-Rather than messing with NM, I'd stick with console commands until you can figure out what is going on. In my opinion, the major function of GUI tools like that is to hide critical errors.

-Check the output of ndiswrapper -l and make sure the driver is loaded and the hardware is present.
One more. When I disconnect the hard line and enter sudo dhclient, this is the response that I get.
Rather than just generally asking all devices to get an IP address, specify a single device: sudo dhclient wlan0. However, this isn't going to work until you get the card configured. You're iwconfig output clearly shows that you haven't entered an SSID or a WEP key. You can use the iwconfig command to set both. If you use WPA encryption, you'll need to install and use wpa_supplicant.

-You probably want to read through your log files (/var/log/syslog, /var/log/messages and the output of the dmesg command) and see if ndiswrapper is loading properly. There might be an error or two.

-Pre-n cards are a known pain in the posterior, so check the ndiswrapper wiki and see if anyone has had success with that card and what drivers they have used.

- This is a long-shot, but check the output of lsmod and see if any of the madwifi drivers have loaded (I think they are usually called ath). I don't think pre-n cards are supported by madwifi, but Ubuntu may have seen the Atheros chipset and loaded madwifi anyways. Having two drivers trying to communicate with a single card usually causes trouble.


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
network-manager can't find my wireless devices asimov Ubuntu 4 09-27-2007 09:48 AM
Wireless network manager using WPA encryption dgranger Linux - Wireless Networking 14 09-20-2006 12:23 PM
Need help troubleshooting broken network manager wireless stardotstar Linux - Wireless Networking 3 09-16-2006 09:51 PM
Network manager and Wireless iseebluuue Ubuntu 2 08-25-2006 04:26 AM
wireless network manager gui? BCarey Slackware 7 05-06-2006 10:45 PM

All times are GMT -5. The time now is 03:06 AM.

Main Menu
Write for LQ is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration