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Thread: CTS protection enabled / disabled

  1. #1
    Join Date
    Apr 2008
    Location
    Greece, Athens
    Beans
    576
    Distro
    Ubuntu 8.04 Hardy Heron

    CTS protection enabled / disabled

    Hi all,
    I have no functionality issues at all with my wireless card but I noticed that I get a very strange log (dmesg) from this device.

    Code:
    [  193.237453] wlan0: CTS protection enabled (BSSID=xx:xx:xx:xx:xx:xx)
    [  194.669106] wlan0: CTS protection disabled (BSSID=xx:xx:xx:xx:xx:xx)
    [  194.873635] wlan0: CTS protection enabled (BSSID=xx:xx:xx:xx:xx:xx)
    [  201.009419] wlan0: CTS protection disabled (BSSID=xx:xx:xx:xx:xx:xx)
    [  201.315851] wlan0: CTS protection enabled (BSSID=xx:xx:xx:xx:xx:xx)
    [  202.338428] wlan0: CTS protection disabled (BSSID=xx:xx:xx:xx:xx:xx)
    [  202.440658] wlan0: CTS protection enabled (BSSID=xx:xx:xx:xx:xx:xx)
    [  206.530976] printk: 4 messages suppressed.
    [  206.530986] wlan0: CTS protection disabled (BSSID=xx:xx:xx:xx:xx:xx)
    [  211.541593] printk: 6 messages suppressed.
    [  211.541603] wlan0: CTS protection enabled (BSSID=xx:xx:xx:xx:xx:xx)
    [  218.801864] printk: 4 messages suppressed.
    [  218.801874] wlan0: CTS protection disabled (BSSID=xx:xx:xx:xx:xx:xx)
    [  221.767332] printk: 3 messages suppressed.
    [  221.767342] wlan0: CTS protection disabled (BSSID=xx:xx:xx:xx:xx:xx)
    [  228.209531] printk: 5 messages suppressed.
    [  228.209536] wlan0: CTS protection disabled (BSSID=xx:xx:xx:xx:xx:xx)
    [  231.379523] printk: 4 messages suppressed.
    [  231.379533] wlan0: CTS protection enabled (BSSID=xx:xx:xx:xx:xx:xx)
    [  236.696910] printk: 3 messages suppressed.
    [  236.696920] wlan0: CTS protection enabled (BSSID=xx:xx:xx:xx:xx:xx)
    Has anybody noticed this?

    My card:

    Network controller: Intel Corporation PRO/Wireless 3945ABG Network Connection (rev 02)
    8.10 on HDX16-1050ev
    #22144
    My Ubuntu Blog

  2. #2
    Join Date
    Sep 2007
    Location
    China
    Beans
    4
    Distro
    Ubuntu CE

    Exclamation Re: CTS protection enabled / disabled

    [ 864.609030] wlan0: CTS protection enabled (BSSID=00:11:50:b6:d5:d7)
    [ 867.274650] wlan0: CTS protection disabled (BSSID=00:11:50:b6:d5:d7)
    [ 872.742739] wlan0: CTS protection enabled (BSSID=00:11:50:b6:d5:d7)
    [ 875.749706] wlan0: CTS protection disabled (BSSID=00:11:50:b6:d5:d7)
    [ 885.073207] wlan0: CTS protection enabled (BSSID=00:11:50:b6:d5:d7)
    [ 887.707606] wlan0: CTS protection disabled (BSSID=00:11:50:b6:d5:d7)
    [ 900.685441] wlan0: CTS protection enabled (BSSID=00:11:50:b6:d5:d7)
    [ 903.788711] wlan0: CTS protection disabled (BSSID=00:11:50:b6:d5:d7)
    [ 928.044947] wlan0: CTS protection enabled (BSSID=00:11:50:b6:d5:d7)
    [ 928.892039] wlan0: CTS protection disabled (BSSID=00:11:50:b6:d5:d7)
    [ 934.590434] wlan0: CTS protection enabled (BSSID=00:11:50:b6:d5:d7)
    [ 935.791473] wlan0: CTS protection disabled (BSSID=00:11:50:b6:d5:d7)


    mine

  3. #3
    Join Date
    Aug 2006
    Location
    Orlando, FL
    Beans
    Hidden!

    Re: CTS protection enabled / disabled

    I'm getting the same.

  4. #4
    Join Date
    Nov 2007
    Beans
    14

    Re: CTS protection enabled / disabled

    I have the exact same problem, using the b43 driver. Anyone know what it is or how to stop it?

  5. #5
    Join Date
    Nov 2007
    Beans
    1

    Re: CTS protection enabled / disabled

    I am experiencing the same problem with my mother's laptop and I have noticed that the system crawls to a halt. Even though the module isn't taking 100% CPU, the time consumed by the module is extremely high (higher than X) and the system becomes practically unresponsive until all network traffic stops and/or I unload the b43 module.

    This is running the stock kubuntu 2.6.24-19 kernel + modules.

  6. #6
    Join Date
    Apr 2008
    Location
    Innsbruck, Austria
    Beans
    35
    Distro
    Ubuntu 9.10 Karmic Koala

    Re: CTS protection enabled / disabled

    I have the same problem as Kyron: massive CPU usage when network traffic is involved, although it seems I use the module rt73usb. (It's a Linksys Wireless-G USB adapter, if that helps anything ).

    Although I'm happy to give kudos to the Ubuntu, Kernel and NetworkManager team for making the wireless setup such a breeze, I have to say that this problem is quite a killer for me, because I can't even listen to music while I download something or load an internet page (music stutters ).

    I would be glad to give more information to solve the problem.

  7. #7
    Join Date
    Apr 2007
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    33

    Re: CTS protection enabled / disabled

    Slightly off topic: I noticed that with kernels higher than 2.6.24-18, CTS is enabled by default on EAP-TLS-connections even though CTS isn't enabled on the Access Point. Because of that, I can only connect to EAP-TLS-Access Points on kernel 2.6.24-18 - weird.

    Have you noticed any pattern in the CTS problem and kernel version?

  8. #8
    Join Date
    Feb 2007
    Beans
    65

    Re: CTS protection enabled / disabled

    The same messages started showing in my syslog yesterday, this is the first time such messages appear so frequently, 2 to 10 seconds between them. I guess there is a connection between the appearence of these messages and yesterdays update to the network-manager. Anyone else started getting these messages?

  9. #9
    Join Date
    Apr 2008
    Location
    Greece, Athens
    Beans
    576
    Distro
    Ubuntu 8.04 Hardy Heron

    Re: CTS protection enabled / disabled

    Quote Originally Posted by plamen_todoroff View Post
    The same messages started showing in my syslog yesterday, this is the first time such messages appear so frequently, 2 to 10 seconds between them. I guess there is a connection between the appearence of these messages and yesterdays update to the network-manager. Anyone else started getting these messages?
    I had this issue resolved by updates automatically. I will check if the new updates cause this again and i will get back to you.
    8.10 on HDX16-1050ev
    #22144
    My Ubuntu Blog

  10. #10
    Join Date
    Apr 2007
    Beans
    33

    Re: CTS protection enabled / disabled

    Quote Originally Posted by hermes0710 View Post
    I had this issue resolved by updates automatically. I will check if the new updates cause this again and i will get back to you.
    I am having other troubles with the newest kernel update 2.6.24-21: Xorg wont start - so I am not able to try with that kernel version right now.

    I just discovered I received a 2.6.24-23 kernel update, which I will boot into later today.

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