LinuxQuestions.org
Did you know LQ has a Linux Hardware Compatibility List?
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - Networking > Linux - Wireless Networking
User Name
Password
Linux - Wireless Networking This forum is for the discussion of wireless networking in Linux.

Notices

Reply
 
Search this Thread
Old 12-29-2008, 03:08 AM   #1
kendo9991
LQ Newbie
 
Registered: Nov 2008
Posts: 5

Rep: Reputation: 0
Reconnecting wireless network in Ubuntu


On occasion (cause not yet found) my wireless connection breaks. When I go into Network Manager, I have found, by experimenting, that I can reconnect by a) unlocking by giving password, b) clicking on the ticked box against "Wireless connection" and waiting as it re-ticks the box, c) highlighting "Wireless connection" and clicking on "Properties" d) changing DHCP to IPv4 LL, changing back to DHCP and then waiting for the network interface change to take effect. Usually this reconnects.

If I go into "Connection Properties" and try to "Configure", I am told that "The interface does not exist" yet a connection is there. Entering "sudo iwconfig" I can see that wlan0 has Tx-Power=27 dBm, Link Quality 69/100 and Signal level=-62 dBm. I am using a Cable & Wireless rt2500 PCMCIA card on a Compaq Evo N800C laptop.

Is there a better way to get back on? Should the interface "exist"? Does this indicate a fault that I can correct?

Thanks in advance

Last edited by kendo9991; 12-29-2008 at 03:14 AM. Reason: Trying to add tags
 
Old 12-29-2008, 09:13 AM   #2
digital8doug
Member
 
Registered: Aug 2006
Location: Near Binghamton, NY-the recent FLOOD zone
Distribution: Sabayon 351, Mepis8, oSuse11.3, Kubuntu8.1, Fed10, Slack12.1 #426299 RLU
Posts: 145
Blog Entries: 1

Rep: Reputation: 15
Lightbulb Try iommu=noaperture as kernel boot option, then edit /boot/grub/menu.lst

Just a guess as I had similar problems, see thread on iommu.

Quote:
Originally Posted by kendo9991 View Post
SNPD/EDTD On occasion (cause not yet found) my wireless connection breaks.
Is there a better way to get back on? Should the interface "exist"? Does this indicate a fault that I can correct?
Use command on boot to see if it helps. If so, then edit loader.

Does not hurt to try, may solve it, as it did for me in Kubuntu 8.1, 9.04 & Fedora.
http://www.linuxquestions.org/questi...y-hole-624088/

Good info even though there was a bit of fire exchanged

Please LET US KNOW IF THIS WORKS

Last edited by digital8doug; 12-29-2008 at 10:21 PM.
 
Old 12-30-2008, 03:01 AM   #3
kendo9991
LQ Newbie
 
Registered: Nov 2008
Posts: 5

Original Poster
Rep: Reputation: 0
Thanks for your quick reply. I gather from the link that I should try adding iommu=noapg to the kernel line in menu.lst. I will do that and if the disconnection recurs, I will let you know to see if there are any other ideas. As this disconnection happened only occasionally, it may be a while before I am confident that this has fixed it.
 
Old 12-30-2008, 03:03 AM   #4
kendo9991
LQ Newbie
 
Registered: Nov 2008
Posts: 5

Original Poster
Rep: Reputation: 0
Well since writing back to you, it has gone down twice so the additional parameter has not helped. My workaround has resurrected the connection but the procedure is a bit unwieldy. Does anyone have other ideas?

Last edited by kendo9991; 12-30-2008 at 01:13 PM. Reason: Updated information
 
Old 02-04-2009, 03:09 AM   #5
kendo9991
LQ Newbie
 
Registered: Nov 2008
Posts: 5

Original Poster
Rep: Reputation: 0
Update.

I have ditched the Linksys wireless and Etec ADSL in favour of a Netgear ADSL/Wireless router and upgraded from Ubuntu 8.04 to 8.10. There has been no loss of connection since then.

As an aside, with Ubuntu 8.10, the rt2500 ran slow (1Mb/s) and at low signal strength until I forced 54Mb/s. If I use a C&W USB dongle instead, I get 100% signal strength and full speed but I prefer the PCMCIA as it leaves a USB port free and is less prone to accidental knocking.
 
  


Reply

Tags
ubuntu, wireless


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
Wireless device crash when wireless network is lost (ubuntu/gutsy on ThinkPad) daganesh Linux - Wireless Networking 6 11-24-2008 05:06 AM
Ubuntu network install using eth1 wireless network detection failed! xterminator890i Linux - Networking 3 06-23-2008 12:26 PM
cant get network wireless or not on ubuntu 7.04 so white and nerdy Linux - Newbie 17 10-17-2007 09:10 AM
Wireless network on Ubuntu 6.10 FunkyChicken Linux - Software 1 03-10-2007 12:51 PM
network connection doesn't work after reconnecting cable on newer kernels phil.d.g Slackware 1 12-20-2005 03:52 PM


All times are GMT -5. The time now is 09:51 PM.

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