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Old 08-03-2008, 09:16 PM   #1
centguy
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Wireless problem in FC9 x86_64. The network has now been disconnected.


I tried to use the wireless for internet purposes, but when I choose a particular wireless network that is under the list (a network has been confirmed by my colleague that works), after waiting for a while, one little message near the top of menu bar says : Disconnected. The network connection has been disconnected.

I did lspci -v it says Intel Corporation PRO/Wireless 4965 AG or AGN Network Connection. So I guess the driver should be correctly installed.

I appreciate any help!
 
Old 08-04-2008, 03:12 AM   #2
storkus
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lspci only reports what it thinks the device is based on an internal list. I can tell you from first-hand experience that the list is sometimes wrong! In addition, it tells you nothing about the state of the device's driver (and has nothing to do with it, actually). Remember, this isn't winblows: things work differently here.

So let's start with something simple: do you have network connectivity at all? That is, can you talk when you first connect to the network, or does it just say it's connected but you can't pass any data?

If you have a connection that works but dies later, the problem may be a driver not up to snuff, a bad wireless NIC, a bad access point, or maybe you're just on the fringe area of the wireless network. Also, remember that on anything other than 802.11a the band is use is the 2.4 GHz ISM (Industrial, Scientific, and Medical--unlicensed transmitters) which is getting to be *VERY* crowded, from the itty-bitty Bluetooth headsets to the king of them all, the microwave oven. What this means is that you must rule out interference.

If you can't connect at all, it could be any of the above (but in worse amounts) or just a bad or wrong driver: are you sure your device is supported? Wireless isn't a very good area of support with companies and Linux, though some of the heaviest development is concentrated on trying to fix that.

Mike
 
Old 08-04-2008, 09:16 PM   #3
centguy
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I don't think there is any issue with the card, since it works fine under WindowsXP now and a 32-bit OpenSUSE partition before (but I decided to switch to centos52 or FC9 for some reason).

This is a brand new installation of FC9 and my concept on wireless is zero.
I just did google search here and there but can't learn much from it.

okay, I gave myself a try:

iwlist wlan0 gives the following output. BTW, the network name is FP-GUEST.
There are 3 Wireless Networks listed (ASTAR-WLAN,FP-GUEST,HCS-WIFI) when
I click on the double-monitor icon at the top.


-----------------------------------------------------------------

wlan0 Scan completed :
Cell 01 - Address: 00:1F:9E:7F:22:C6
ESSID:""
Mode:Master
Frequency:2.412 GHz (Channel 1)
Channel:1
Quality=66/100 Signal level=-67 dBm Noise level=-127 dBm
Encryption keyn
IE: WPA Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : TKIP CCMP
Authentication Suites (2) : 802.1x Proprietary
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : TKIP CCMP
Authentication Suites (2) : 802.1x Proprietary
Bit Rates:6 Mb/s; 9 Mb/s; 11 Mb/s; 12 Mb/s; 18 Mb/s
24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
Extra:tsf=000000a0e77160de
Cell 02 - Address: 00:1F:9E:7F:AF5
ESSID:"FP-GUEST"
Mode:Master
Frequency:2.412 GHz (Channel 1)
Channel:1
Quality=84/100 Signal level=-50 dBm Noise level=-127 dBm
Encryption keyff
Bit Rates:6 Mb/s; 9 Mb/s; 11 Mb/s; 12 Mb/s; 18 Mb/s
24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
Extra:tsf=000000cfaa2d7865
Cell 03 - Address: 00:1F:9E:7F:22:C5
ESSID:"FP-GUEST"
Mode:Master
Frequency:2.412 GHz (Channel 1)
Channel:1
Quality=66/100 Signal level=-67 dBm Noise

... blah blah blah ...

level=-127 dBm
Encryption keyff
Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s
36 Mb/s; 48 Mb/s; 54 Mb/s
Extra:tsf=000000cfaa39b034
Cell 46 - Address: 00:1F:9E:29:6A:BA
ESSID:"FP-GUEST"
Mode:Master
Frequency:5.32 GHz (Channel 64)
Channel:64
Quality=33/100 Signal level=-89 dBm Noise level=-127 dBm
Encryption keyff
Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s
36 Mb/s; 48 Mb/s; 54 Mb/s
Extra:tsf=0000008c7f2e7034



----------------------------------------------


So does this info help ?
 
Old 08-05-2008, 04:05 AM   #4
storkus
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I've got one idea right off the bat: explicitly state in the config you're using (program, script, etc) that you want to use the FP-GUEST network. That way, if one reason for the disconnection is that it tries connecting to a different ESSID access point and drops your wanted network while moving around (or due to multipath or whatever), forcing it to only connect to that ESSID should solve that problem unless the signal strength goes too low.

Mike
 
Old 08-05-2008, 08:36 AM   #5
centguy
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Thanks for the nice idea storkus! I left my laptop at the office and now I am back home so I cannot start to work on the wireless stuff. I appreciate if you can tell me the location of the config file that FC9 might use and the specific things to set in the config file. If not I could google search a little bit. Thanks!
 
Old 08-06-2008, 08:04 AM   #6
storkus
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I'm afraid I can't help you there as I'm a Slackware guy and have never once used Fedora.

Mike
 
Old 08-06-2008, 08:51 AM   #7
centguy
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How about Slackware setup? The structure of linux files' locations tend to be similar.Thanks! I made no progress today.
 
Old 08-10-2008, 11:41 AM   #8
centguy
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Interestingly I found that on one reboot at home, the wireless connection problem was automatically solved by itself. I have yet to try out the connection using other wireless networks (such as the office FP-GUEST in the office as
in the first post in this thread).

I guess once FC9 is rebooted a number of times, the script got rid of some confusing files and it was able to do its properly job again ??
 
Old 08-13-2008, 10:52 PM   #9
centguy
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See the detailed solution at

http://www.centos.org/modules/newbb/...15796&forum=40
 
  


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