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helmut

Member

Registered: 2008-10-10

Posts: 65

[SOLVED]wlanwep encryption is failing after system update(pacman -Syu)

After a system update with "pacman -Syu" my wlan encryption does not work anymore.

If I switch off encryption on my access point, I can communicate without any problems.

I have currently two wlans active, one with encryption, one without. I use the following iwconfig settings

iwconfig wlan0 essid my_open_wlan
iwconfig wlan0 essid my_wep_wlan key s:my_wep_password

In the first case I get the connection, in the second I cannot transmit over the network(Destination Host Unreachable).

lspci:
07:00.0 Network controller: Atheros Communications Inc. AR9287 Wireless Network Adapter (PCI-Express) (rev 01)

iwconfig:
wlan0     IEEE 802.11bgn  ESSID:"wlan_2012"  
          Mode:Managed  Frequency:2.437 GHz  Access Point: 00:04:0E:57:4E:27   
          Bit Rate=1 Mb/s   Tx-Power=13 dBm   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=39/70  Signal level=-71 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:44  Invalid misc:43   Missed beacon:0

ip addr:
3: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
    link/ether ec:55:f9:1d:bf:41 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.11/24 brd 192.168.1.255 scope global wlan0
    inet6 fe80::ee55:f9ff:fe1d:bf41/64 scope link 
       valid_lft forever preferred_lft forever

This is the output for the open wlan. If I try to connect to the encrypted wlan with "iwconfig wlan0 essid "my_encr_wlan" key s:my_wep_password", the iwconfig command gives me:

wlan0     IEEE 802.11bgn  ESSID:"wlan_2007"  
          Mode:Managed  Frequency:2.452 GHz  Access Point: D8:5D:4C:FA:24:0D   
          Bit Rate=5.5 Mb/s   Tx-Power=13 dBm   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=33/70  Signal level=-77 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:2  Invalid misc:1   Missed beacon:0

I have tried wpa_supplicant as well with the same result.

Can anybody give me hint?

Regards
Helmut

Last edited by helmut (2012-03-05 16:31:25)

hokasch

Member

Registered: 2007-09-23

Posts: 1,461

Re: [SOLVED]wlanwep encryption is failing after system update(pacman -Syu)

Wep and ath9k has been buggy for me for a long time now - sometimes it works, sometimes it doesn't. Never got around it, adding "options ath9k nohwcrypt=1" into /etc/modprobe.d/ath9k.conf seemed to work for some time. You could give it a try. The network I have problems with is at the university, they use wep + vpn to connect. I can connect fine (like in your last iwconfig), but dhcpd times out.

If you have control over the network, you could just switch to wpa - safer anyway. Or search the forum for "atheros wep", it is a somewhat common problem I think.

P.S.: please use code tags when posting console output.

Last edited by hokasch (2012-02-18 14:48:24)

helmut

Member

Registered: 2008-10-10

Posts: 65

Re: [SOLVED]wlanwep encryption is failing after system update(pacman -Syu)

@hokasch

Thanks for the hint.

A question: In order to switch off hw encryption, do I have to add "options ath9k nohwcrypt=1" to the file /etc/modprobe.d/modprobe.conf or is it necessary to create a new file /etc/modprobe.d/ath9k.conf?

Gusar

Member

Registered: 2009-08-25

Posts: 3,607

Re: [SOLVED]wlanwep encryption is failing after system update(pacman -Syu)

do I have to add "options ath9k nohwcrypt=1" to the file /etc/modprobe.d/modprobe.conf or is it necessary to create a new file /etc/modprobe.d/ath9k.conf?

Makes no difference. All .conf file in the directory will be parsed, no matter what they're named. As long as they end in .conf

I have a better idea though: Stop using WEP!