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Ticket #1740 (new defect)

Opened 14 years ago

Last modified 14 years ago

Huge invalid nwid, no DHCP.

Reported by: sal@cs.st-and.ac.uk Assigned to:
Priority: minor Milestone:
Component: madwifi: other Version:
Keywords: Cc:
Patch is attached: 0 Pending:

Description (Last modified by mrenzmann)

I have a Thinkpad T41p with Atheros wireless chipset. Mostly it works fine. I'm using Gutsy and NetworkManager (under gnome).

Occasionally it will refuse to complete a connection to a network. iwconfig will show regsitration, but the "Rx invalid nwid" field increases by a few per second" and no DHCP responses are received, so I never get an IP level connection. Usually, a reboot fixes this.

I have one site where it always seems to happen. iwlist ath0 scan gives me:

ath0 Scan completed :
Cell 01 - Address: 00:17:5A:5D:0B:E0
ESSID:"eduroam"
Mode:Master
Frequency:2.412 GHz (Channel 1)
Quality=15/70 Signal level=-80 dBm Noise level=-95 dBm
Encryption keyn
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 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:bcn_int=100
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : WEP-40
Pairwise Ciphers (1) : TKIP
Authentication Suites (1) : 802.1x
IE: WPA Version 1
Group Cipher : WEP-40
Pairwise Ciphers (1) : WEP-40
Authentication Suites (1) : 802.1x
Extra:wme_ie=dd180050f2020101830003a4000027a400004 2435e0062322f00

Cell 02 - Address: 00:14:F2:FC:87:10
ESSID:"eduroam"
Mode:Master
Frequency:2.417 GHz (Channel 2)
Quality=5/70 Signal level=-90 dBm Noise level=-95 dBm
Encryption keyn
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 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:bcn_int=100
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : WEP-40
Pairwise Ciphers (1) : TKIP
Authentication Suites (1) : 802.1x
IE: WPA Version 1
Group Cipher : WEP-40
Pairwise Ciphers (1) : WEP-40
Authentication Suites (1) : 802.1x
Extra:wme_ie=dd180050f2020101830003a4000027a400004 2435e0062322f00

Cell 03 - Address: 00:18:F8:AE:79:46
ESSID:"CIRCA"
Mode:Master
Frequency:2.462 GHz (Channel 11)
Quality=46/70 Signal level=-49 dBm Noise level=-95 dBm
Encryption keyff
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
24 Mb/s; 36 Mb/s; 54 Mb/s; 6 Mb/s; 9 Mb/s
12 Mb/s; 48 Mb/s
Extra:bcn_int=100

Cell 04 - Address: 00:14:7F:4B:6A:E3
ESSID:"BTHomeHub-2C3D"
Mode:Master
Frequency:2.442 GHz (Channel 7)
Quality=2/70 Signal level=-93 dBm Noise level=-95 dBm
Encryption keyn
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
24 Mb/s; 36 Mb/s; 54 Mb/s; 6 Mb/s; 9 Mb/s
12 Mb/s; 48 Mb/s
Extra:bcn_int=100
Extra:wme_ie=dd180050f2020101880003a4000027a400004 2435e0062322f00

I can connect to "eduroam" on channel 1, but I'd rather connect to CIRCA. When I do, I get the excessive invalid nwid problem.

Anyone know what is going on?

Steve

Change History

(follow-up: ↓ 2 ) 01/18/08 06:20:47 changed by mrenzmann

  • description changed.

Two pointers for the beginning: FAQ/SignalTooStrong (this seems to apply to the CIRCA cell) and InvalidNWID.

In cases when you don't get a DHCP lease, try the following:

  1. Increase the distance between AP and client, so that the signal strength is weakened a bit.
  2. Assign an IP address manually.

Does one of these hints help? Which?

What version of MadWifi are you using?

(in reply to: ↑ 1 ) 01/18/08 08:48:25 changed by sal@cs.st-and.ac.uk

Replying to mrenzmann:

From dmesg | grep ath

What version of MadWifi are you using?

[   22.344000] ath_hal: module license 'Proprietary' taints kernel.
[   22.348000] ath_hal: 0.9.18.0 (AR5210, AR5211, AR5212, RF5111, RF5112, RF2413, RF5413)
[   23.184000] ath_pci: 0.9.4.5 (0.9.3.2)
[   23.844000] ath_rate_sample: 1.2 (0.9.3.2)