[Bug 111502] Re: network-manager unreliable with multiple APs

[Teunis Peters]

The bug I reported is the same - except that it happens with older linksys routers and gets worse if the chip starts heating up. I have not tested anywhere with multiple APs.
#482668 - similar but slightly different.

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network-manager unreliable with multiple APs
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[Teunis Peters [via ARCHIVE MAILING LIST 35 Agustinus Rustantio]]

The bug I reported is the same - except that it happens with older linksys routers and gets worse if the chip starts heating up.  I have not tested anywhere with multiple APs.
#482668 - similar but slightly different.

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network-manager unreliable with multiple APs
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[Teunis Peters [via ARCHIVE IDN 45 Agustinus Rustantio]]

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[Bug Watch Updater]

** Changed in: network-manager
Importance: Unknown => High

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[Bug Watch Updater-2154 [via Archive Software & Mailing List Agustinus Rustantio]]

** Changed in: network-manager
   Importance: Unknown => High

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[Pascal Sachs]

I have the problem as well on my netbook (Asus eeePC 1000H) running
Ubuntu 10.10.

My wireless card reports negative values for the signal level for "bad"
APs and positiv values for the good AP. As the noise value is not
reported (noise == 0) the quality of all signals is considered as
maximal.

At the moment I think that the network manager, either consider quality instead of signal level to choose an AP or that it has problems with the mixing of negative and positive values.
As those values comes from the driver, I think the easiest way is to fix the network manager to handle this situation correctly.

Here is some example output from iwlist scan. The network manager tries
to connect to the AP with MAC addr 00:03:52:29:62:43, which is actually
the worst one considering the signal level.

Cell 01 - Address: 00:03:52:29:62:43
Channel:9
Frequency:2.452 GHz (Channel 9)
Quality=70/70 Signal level=-188 dBm
Encryption key:on
ESSID:"eduroam"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
9 Mb/s; 12 Mb/s; 18 Mb/s
Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=000000086a538af7
Extra: Last beacon: 16ms ago
IE: Unknown: 0007656475726F616D
IE: Unknown: 010882848B960C121824
IE: Unknown: 030109
IE: Unknown: 2A0100
--
Cell 12 - Address: 00:03:52:1C:18:43
Channel:9
Frequency:2.452 GHz (Channel 9)
Quality=70/70 Signal level=50 dBm
Encryption key:on
ESSID:"eduroam"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
9 Mb/s; 12 Mb/s; 18 Mb/s
Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=00000008848ace68
Extra: Last beacon: 460ms ago
IE: Unknown: 0007656475726F616D
IE: Unknown: 010882848B960C121824
IE: Unknown: 030109
IE: Unknown: 2A0100
--
Cell 16 - Address: 00:03:52:1B:F5:03
Channel:9
Frequency:2.452 GHz (Channel 9)
Quality=70/70 Signal level=-182 dBm
Encryption key:on
ESSID:"eduroam"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
9 Mb/s; 12 Mb/s; 18 Mb/s
Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=000000090231fecc
Extra: Last beacon: 1168ms ago
IE: Unknown: 0007656475726F616D
IE: Unknown: 010882848B960C121824
IE: Unknown: 030109
IE: Unknown: 050400010000
--
Cell 18 - Address: 00:03:52:1C:32:93
Channel:9
Frequency:2.452 GHz (Channel 9)
Quality=70/70 Signal level=-182 dBm
Encryption key:on
ESSID:"eduroam"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
9 Mb/s; 12 Mb/s; 18 Mb/s
Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=000000089c363177
Extra: Last beacon: 536ms ago
IE: Unknown: 0007656475726F616D
IE: Unknown: 010882848B960C121824
IE: Unknown: 030109
IE: Unknown: 050400010000
--
Cell 21 - Address: 00:03:52:1C:24:43
Channel:9
Frequency:2.452 GHz (Channel 9)
Quality=70/70 Signal level=-181 dBm
Encryption key:on
ESSID:"eduroam"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
9 Mb/s; 12 Mb/s; 18 Mb/s
Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=00000008783cd417
Extra: Last beacon: 548ms ago
IE: Unknown: 0007656475726F616D
IE: Unknown: 010882848B960C121824
IE: Unknown: 030109
IE: Unknown: 050400010000
--
Cell 25 - Address: 00:03:52:1C:08:C3
Channel:13
Frequency:2.472 GHz (Channel 13)
Quality=70/70 Signal level=-183 dBm
Encryption key:on
ESSID:"eduroam"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
9 Mb/s; 12 Mb/s; 18 Mb/s
Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=000000087d525e68

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https://bugs.launchpad.net/bugs/111502

Title:

network-manager unreliable with multiple APs

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[Keith Berkoben]

I can confirm the same issue in 10.04 with network manager. In a hall
with a dozen or so APs on the same SSID.

log looks like this while trying to connect:
Mar 3 19:42:28 keith-t61u NetworkManager: <info> Activation (wlan0/wireless): connection 'Auto MIT' requires no security. No secrets needed.
Mar 3 19:42:28 keith-t61u NetworkManager: <info> Config: added 'ssid' value 'MIT'
Mar 3 19:42:28 keith-t61u NetworkManager: <info> Config: added 'scan_ssid' value '1'
Mar 3 19:42:28 keith-t61u NetworkManager: <info> Config: added 'key_mgmt' value 'NONE'
Mar 3 19:42:28 keith-t61u NetworkManager: <info> Activation (wlan0) Stage 2 of 5 (Device Configure) complete.
Mar 3 19:42:28 keith-t61u NetworkManager: <info> (wlan0): supplicant connection state: scanning -> disconnected
Mar 3 19:42:28 keith-t61u NetworkManager: <info> Config: set interface ap_scan to 1
Mar 3 19:42:30 keith-t61u NetworkManager: <info> (wlan0): supplicant connection state: disconnected -> scanning
Mar 3 19:42:41 keith-t61u wpa_supplicant[988]: IWEVGENIE overflow
Mar 3 19:42:43 keith-t61u NetworkManager: <info> wlan0: link timed out.
Mar 3 19:42:47 keith-t61u wpa_supplicant[988]: IWEVGENIE overflow

[Mathieu Trudel-Lapierre]

Pascal, Keith, what you're describing here appear to be different bugs,
most likely at the level of the wireless drivers, please file separate
bug reports for them.