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Sujao
l33t
Joined: 25 Sep 2004
Posts: 677
Location: Germany
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 Posted: Mon Jul 12, 2010 3:48 pm Post subject: [Solv]Problems debuging periodical wireless connection loss. |
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Hey guys,
my Gentoo machine is loosing it's wireless connection regulary. The problem is that this happens on a layer that most tools I use to check it don't recognize it. I only notice it when my instant messenger looses it's connection (I guess due to a timeout) or a http connection times out in firefox.
I monitored the output of iwconfig wlan1, ifconfig wlan1, dmesg and the debug output of wpa_supplicant but neither of them changes on a connection loss.
Here is what kopete tells me in a chat windows after several hours.
| Code: | (14:47:01) # You are now marked as Offline.
(14:47:13) # You are now marked as Online.
(15:01:27) # You are now marked as Offline.
(15:01:39) # You are now marked as Online.
(15:11:53) # You are now marked as Offline.
(15:12:04) # You are now marked as Online.
(15:22:19) # You are now marked as Offline.
(15:22:30) # You are now marked as Online.
(15:32:44) # You are now marked as Offline.
(15:33:01) # You are now marked as Online.
(15:43:15) # You are now marked as Offline.
(15:43:32) # You are now marked as Online.
(15:53:46) # You are now marked as Offline.
(15:53:57) # You are now marked as Online.
(16:17:21) # You are now marked as Offline.
(16:17:32) # You are now marked as Online.
(16:35:43) # You are now marked as Online. |
Here is a ping output (the one in the middle is the connection loss I guess)
| Code: | ...
64 bytes from bender.bawue.de (193.7.176.20): icmp_seq=666 ttl=55 time=95.2 ms
64 bytes from bender.bawue.de (193.7.176.20): icmp_seq=667 ttl=55 time=43.2 ms
64 bytes from bender.bawue.de (193.7.176.20): icmp_seq=689 ttl=55 time=1002 ms
64 bytes from bender.bawue.de (193.7.176.20): icmp_seq=690 ttl=55 time=46.4 ms
64 bytes from bender.bawue.de (193.7.176.20): icmp_seq=691 ttl=55 time=15.2 ms
... |
At the moment I use the atk5k kernel module in 2.6.33-zen1 with a TP-Link TL-WN350G Wireless PCI card. The router/access point is a D-Link DIR-301.
/etc/wpa_supplicant/wpa_supplicant.conf (replaced ssid and psk with <x>)
| Code: |
ctrl_interface=/var/run/wpa_supplicant
eapol_version=1
ap_scan=1
fast_reauth=1
network={
ssid="<myssid>"
psk=<mykey>
proto=WPA2
key_mgmt=WPA-PSK
pairwise=CCMP
group=CCMP
} |
/etc/conf.d/net
| Code: | config_wlan1=( "192.168.0.101/24 brd 192.168.0.255 ")
routes_wlan1=(
"default via 192.168.0.1"
)
dns_servers=( "192.168.0.1")
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I don't understand on what layer the connection loss is happening and what kind of tools could catch the error? Do you have any ideas?
Last edited by Sujao on Sat Aug 07, 2010 11:39 pm; edited 1 time in total |
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dermund
Apprentice
Joined: 28 Aug 2007
Posts: 205
Location: Sprawl
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| Posted: Thu Jul 15, 2010 10:22 am Post subject: |
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Hi Sujao,
| Code: | (14:47:01) # You are now marked as Offline.
(14:47:13) # You are now marked as Online.
(15:01:27) # You are now marked as Offline.
(15:01:39) # You are now marked as Online.
(15:11:53) # You are now marked as Offline.
(15:12:04) # You are now marked as Online.
(15:22:19) # You are now marked as Offline.
(15:22:30) # You are now marked as Online.
(15:32:44) # You are now marked as Offline.
(15:33:01) # You are now marked as Online.
(15:43:15) # You are now marked as Offline.
(15:43:32) # You are now marked as Online.
(15:53:46) # You are now marked as Offline.
(15:53:57) # You are now marked as Online.
(16:17:21) # You are now marked as Offline.
(16:17:32) # You are now marked as Online.
(16:35:43) # You are now marked as Online.
|
Almost every 10 minutes ... a pattern emerges! 
| Sujao wrote: | | I don't understand on what layer the connection loss is happening and what kind of tools could catch the error? Do you have any ideas? |
I once captured packets with wireshark and it worked quite good - it captures everything but the physical layer. So the output should bring you enlightenment. If you never worked with wireshark before the wireless setup could be a challenging task. However it is worth the effort.
Kind regards,
dermund |
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Sujao
l33t
Joined: 25 Sep 2004
Posts: 677
Location: Germany
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| Posted: Sat Aug 07, 2010 11:38 pm Post subject: |
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| I updated my router D-Link DIR-301 and haven't had any connection losses since. So it was its fault all the time. |
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