Unstable wifi network connection

SUSE Linux Enterprise Desktop SLED Networking
1

I noticed that a network connection through a wifi router is unstable. It started after some recent updates had been installed. For some time connection is lost then it appears again. The router itself is reachable and remote DNS server as well. But I can’t load any webpage. Sometimes it’s possible to connect though ftp protocol but not http. If I reconnect network is working for some time again.
Here’s a system log from the period of time when the connection is lost:

[QUOTE]Feb 29 16:10:26 alex kernel: [ 9213.060094] Scan in 40M, force to 20M first:3, 1
Feb 29 16:10:27 alex kernel: [ 9214.520074] Scan in 20M, back to 40M
Feb 29 16:10:27 alex kernel: [ 9214.530071] ===>rtl8192se_link_change():ieee->iw_mode is 2
Feb 29 16:10:27 alex kernel: [ 9214.530076] rtl8192_update_cap(): WLAN_CAPABILITY_SHORT_PREAMBLE
Feb 29 16:10:34 alex kernel: [ 9221.872059] SetHwReg8192SE():HW_VAR_AC_PARAM eACI:0:a42b
Feb 29 16:10:42 alex kernel: [ 9229.871812] SetHwReg8192SE():HW_VAR_AC_PARAM eACI:0:a42b
Feb 29 16:10:48 alex kernel: [ 9235.871383] SetHwReg8192SE():HW_VAR_AC_PARAM eACI:0:a42b
Feb 29 16:11:06 alex kernel: [ 9253.003305] ===>rtl8192se_link_change():ieee->iw_mode is 2
Feb 29 16:11:06 alex kernel: [ 9253.056590] Scan in 40M, force to 20M first:3, 1
Feb 29 16:11:07 alex kernel: [ 9254.516592] Scan in 20M, back to 40M
Feb 29 16:11:07 alex kernel: [ 9254.526600] ===>rtl8192se_link_change():ieee->iw_mode is 2
Feb 29 16:11:07 alex kernel: [ 9254.526606] rtl8192_update_cap(): WLAN_CAPABILITY_SHORT_PREAMBLE
Feb 29 16:11:10 alex kernel: [ 9257.871436] SetHwReg8192SE():HW_VAR_AC_PARAM eACI:0:a42b
Feb 29 16:11:14 alex kernel: [ 9261.871836] SetHwReg8192SE():HW_VAR_AC_PARAM eACI:0:a42b
Feb 29 16:11:30 alex kernel: [ 9277.871312] SetHwReg8192SE():HW_VAR_AC_PARAM eACI:0:a42b
Feb 29 16:11:46 alex kernel: [ 9293.871836] SetHwReg8192SE():HW_VAR_AC_PARAM eACI:0:a42b
Feb 29 16:12:06 alex kernel: [ 9313.002945] ===>rtl8192se_link_change():ieee->iw_mode is 2
Feb 29 16:12:06 alex kernel: [ 9313.056071] Scan in 40M, force to 20M first:3, 1
Feb 29 16:12:07 alex kernel: [ 9314.512081] Scan in 20M, back to 40M
Feb 29 16:12:07 alex kernel: [ 9314.522080] ===>rtl8192se_link_change():ieee->iw_mode is 2
Feb 29 16:12:07 alex kernel: [ 9314.522085] rtl8192_update_cap(): WLAN_CAPABILITY_SHORT_PREAMBLE
Feb 29 16:12:13 alex kernel: [ 9320.176757] RX: IEEE802.1X EAPOL frame!
Feb 29 16:12:13 alex kernel: [ 9320.176904] alg name:CCMP
Feb 29 16:12:13 alex kernel: [ 9320.176921] ===========>set_swcam():EntryNo is 2,KeyIndex is 2,KeyType is 4,is_mesh is 0
Feb 29 16:12:28 alex kernel: [ 9335.615175] rtllib_rx_decrypt: decrypt frame error[/QUOTE]

2

AlexDudko,

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3

Hi
Are there many other wireless access points about, maybe on the same
channel and causing interference?

–
Cheers Malcolm °¿° (Linux Counter #276890)
SUSE Linux Enterprise Desktop 11 (x86_64) Kernel 3.0.13-0.27-default
up 1 day 10:15, 4 users, load average: 0.00, 0.01, 0.05
CPU Intel i5 CPU M520@2.40GHz | Intel Arrandale GPU

4

[QUOTE=malcolmlewis;2914]Hi
Are there many other wireless access points about, maybe on the same
channel and causing interference?

–
Cheers Malcolm °¿° (Linux Counter #276890)
SUSE Linux Enterprise Desktop 11 (x86_64) Kernel 3.0.13-0.27-default
up 1 day 10:15, 4 users, load average: 0.00, 0.01, 0.05
CPU Intel i5 CPU M520@2.40GHz | Intel Arrandale GPU[/QUOTE]

No, there are none. There is no interference. I thought it had been solved by the upgrade to SP-2 but now I see this behaviour remains. If I connect from another computer or boot into another OS - everything is fine.
If it happens System Monitor starts to show it downloads packages on a very high speed, though at the same time nethogs shows 0. This high speed is impossible because it exceeds the limits, set by the provider.