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Thread: Unable to scan Wifi networks?

  1. #11
    Join Date
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    Ubuntu 17.04 Zesty Zapus

    Re: Unable to scan Wifi networks?

    @kmads-
    There is evidently a better iwl3945 in here:
    Code:
    sudo apt-get install linux-backports-modules-hardy-generic
    After I installed this, mine works perfectly.

    Do you have a iwl3945 issue or a Network Manager issue? I doubt it's iwl3945, judging by the flawless service I, and many others get from it.
    "Oh, Ubuntu, you are my favorite Linux-based operating system" --Dr. Sheldon Cooper, Ph.D.

  2. #12
    Join Date
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    Re: Unable to scan Wifi networks?

    Quote Originally Posted by chili555 View Post
    @kmads-
    There is evidently a better iwl3945 in here:
    Code:
    sudo apt-get install linux-backports-modules-hardy-generic
    After I installed this, mine works perfectly.

    Do you have a iwl3945 issue or a Network Manager issue? I doubt it's iwl3945, judging by the flawless service I, and many others get from it.
    Yes, I have installed the module. I guess it could be an issue with the Network Manager - do you have any good clues how to find out?

    Thanks,
    Mads

  3. #13
    Join Date
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    Ubuntu 17.04 Zesty Zapus

    Re: Unable to scan Wifi networks?

    Does your iwconfig look heathy? That is, something like this:
    Code:
    eth1      IEEE 802.11g  ESSID:""  Nickname:""
              Mode:Managed  Frequency:2.462 GHz  Access Point: Not-Associated   
              Tx-Power=27 dBm 
    ---snip---
    Your interface may be wlan0. Please temporarily stop Network Manager:
    Code:
    sudo /etc/dbus-1/event.d/26NetworkManagerDispatcher stop
    sudo /etc/dbus-1/event.d/25NetworkManager stop
    Do you get a result when you do:
    Code:
    sudo iwlist eth1 scan
    Can you turn off encryption in your router, just for a few moments, and do:
    Code:
    sudo iwconfig eth1 essid <essid_u_found_in_scan>
    sudo iwconfig eth1 ap <mac_address_of_router_u_found_in_scan>
    sudo dhclient eth1
    Do you connect?
    "Oh, Ubuntu, you are my favorite Linux-based operating system" --Dr. Sheldon Cooper, Ph.D.

  4. #14
    Join Date
    Apr 2008
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    Re: Unable to scan Wifi networks?

    Hi chili555 - thanks for replying so quickly.

    iwconfig does look healthy both when it is connected and when it isn't.

    When I do:
    Code:
    sudo /etc/dbus-1/event.d/26NetworkManagerDispatcher stop
    sudo /etc/dbus-1/event.d/25NetworkManager stop
    then
    Code:
    iwlist eth1 scan
    does not give any results. When I turn them on again the same command outputs all available neworks.

    I am not able to turn off the encryption on the router.

    When I start network-admin from the command-line I get the following output:
    Code:
    (network-admin:9636): Gtk-WARNING **: Unknown property: GtkComboBox.items
    
    [WARN  9636] kit-hash.c:206:kit_hash_insert(): key != NULL
     Not built with -rdynamic so unable to print a backtrace
    Thanks,
    -Mads

  5. #15
    Join Date
    May 2008
    Beans
    7

    Re: Unable to scan Wifi networks?

    Quote Originally Posted by Ayuthia View Post
    Can you post your lshw -C network? It will help us see what driver it is trying to use (if any).

    The Broadcom cards needs to have either the firmware installed (b43-fwcutter) or use NDISwrapper. If you don't know, can you post:
    Code:
    ls /lib/firmware
    ndiswrapper -v
    ndiswrapper -l
    If there is firmware installed, it will be found in /lib/firmware. The last to options will see what version of ndiswrapper is installed and what driver it is trying to use.
    i didn't get you
    can you tell me how to get lshw -C network?

    *******************************************
    From my earlier post in this forum:

    This is the output I got from lspci

    00:00.0 Host bridge: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and 945GT Express Memory Controller Hub (rev 03)
    00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03)
    00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller (rev 03)
    00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 01)
    00:1c.0 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 1 (rev 01)
    00:1c.1 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 2 (rev 01)
    00:1c.3 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 4 (rev 01)
    00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #1 (rev 01)
    00:1d.1 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #2 (rev 01)
    00:1d.2 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #3 (rev 01)
    00:1d.3 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #4 (rev 01)
    00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2 EHCI Controller (rev 01)
    00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev e1)
    00:1f.0 ISA bridge: Intel Corporation 82801GBM (ICH7-M) LPC Interface Bridge (rev 01)
    00:1f.2 IDE interface: Intel Corporation 82801GBM/GHM (ICH7 Family) SATA IDE Controller (rev 01)
    02:06.0 CardBus bridge: Texas Instruments PCIxx12 Cardbus Controller
    02:06.1 FireWire (IEEE 1394): Texas Instruments PCIxx12 OHCI Compliant IEEE 1394 Host Controller
    02:0e.0 Ethernet controller: Broadcom Corporation BCM4401-B0 100Base-TX (rev 02)
    10:00.0 Network controller: Broadcom Corporation BCM94311MCG wlan mini-PCI (rev 01)

  6. #16
    Join Date
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    Re: Unable to scan Wifi networks?

    Quote Originally Posted by kmads View Post
    Hi chili555 - thanks for replying so quickly.

    iwconfig does look healthy both when it is connected and when it isn't.

    When I do:
    Code:
    sudo /etc/dbus-1/event.d/26NetworkManagerDispatcher stop
    sudo /etc/dbus-1/event.d/25NetworkManager stop
    then
    Code:
    iwlist eth1 scan
    does not give any results. When I turn them on again the same command outputs all available neworks.

    I am not able to turn off the encryption on the router.

    When I start network-admin from the command-line I get the following output:
    Code:
    (network-admin:9636): Gtk-WARNING **: Unknown property: GtkComboBox.items
    
    [WARN  9636] kit-hash.c:206:kit_hash_insert(): key != NULL
     Not built with -rdynamic so unable to print a backtrace
    Thanks,
    -Mads
    chili@LAPTOP60:~$ iwlist eth1 scan
    eth1 No scan results

    chili@LAPTOP60:~$ sudo iwlist eth1 scan
    [sudo] password for chili:
    eth1 Scan completed :
    Cell 01 - Address: 00:0C:41:19:58:77
    ESSID:"GBR9"
    Mode:Master
    Channel:11
    ---snip---
    Cell 02 - Address: 00:13:10:62:8D:F7
    ESSID:"GBR1"
    Mode:Master
    Channel:11
    ---snip---
    To get meaningful scan results, iwlist must be run sudo. Your wireless card seems to be doing everything you would expect. A lot of people have greater success with Wicd and uninstall Network Manager, including me. http://wicd.sourceforge.net/
    "Oh, Ubuntu, you are my favorite Linux-based operating system" --Dr. Sheldon Cooper, Ph.D.

  7. #17
    Join Date
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    Mount Horeb, WI
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    Distro
    Kubuntu Development Release

    Re: Unable to scan Wifi networks?

    Quote Originally Posted by ashish25 View Post
    i didn't get you
    can you tell me how to get lshw -C network?

    *******************************************

    This is the output I got from lspci

    02:0e.0 Ethernet controller: Broadcom Corporation BCM4401-B0 100Base-TX (rev 02)
    10:00.0 Network controller: Broadcom Corporation BCM94311MCG wlan mini-PCI (rev 01)
    You will need to open the Terminal (just like how you did lspci) and at the prompt, you will need to type
    Code:
    lshw -C network
    It will tell you that you should do this as super user, but that is ok. The other two commands are also from the Terminal
    Code:
    ndiswrapper -v
    ndiswrapper -l

  8. #18
    Join Date
    May 2008
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    7

    Re: Unable to scan Wifi networks?

    lshw -C network
    ndiswrapper -v
    ndiswrapper -l

    this commands are not working

    this is the output from iwconfig

    eth0 no wireless extensions.
    wmaster0 no wireless extensions.

    wlan0 IEEE 802.11g ESSID:""
    Mode:Managed Channel:0
    Access Point: Not-Associated
    Tx-Power=0 dBm
    Retry min limit:7
    RTS thr: off
    Fragment thr=2346 B
    Link Quality:0
    Signal level:0
    Noise level:0
    Rx invalid nwid:0
    Rx invalid crypt:0
    Rx invalid frag:0
    Tx excessive retries:0
    Invalid misc:0
    Missed beacon:0

  9. #19
    Join Date
    Oct 2007
    Location
    Earth
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    Hidden!
    Distro
    Ubuntu

    Re: Unable to scan Wifi networks?

    Quote Originally Posted by chili555 View Post
    @kmads-
    There is evidently a better iwl3945 in here:
    Code:
    sudo apt-get install linux-backports-modules-hardy-generic
    After I installed this, mine works perfectly.

    Do you have a iwl3945 issue or a Network Manager issue? I doubt it's iwl3945, judging by the flawless service I, and many others get from it.
    Is that backport-modules-etc... a required thing?

    It looks like my toshiba has an intel 3945abg, default driver iwl3945 (although a thread in here says it should be ipw3945)...

    Before I try that install I'd like to know that it's safe and won't screw anything up, or at the very least, can be put back to how it was before if the need arises. ??

    Thanks

  10. #20
    Join Date
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    Location
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    Distro
    Kubuntu Development Release

    Re: Unable to scan Wifi networks?

    Quote Originally Posted by ashish25 View Post
    lshw -C network
    ndiswrapper -v
    ndiswrapper -l

    this commands are not working

    this is the output from iwconfig

    eth0 no wireless extensions.
    wmaster0 no wireless extensions.

    wlan0 IEEE 802.11g ESSID:""
    Mode:Managed Channel:0
    Access Point: Not-Associated
    Tx-Power=0 dBm
    Retry min limit:7
    RTS thr: off
    Fragment thr=2346 B
    Link Quality:0
    Signal level:0
    Noise level:0
    Rx invalid nwid:0
    Rx invalid crypt:0
    Rx invalid frag:0
    Tx excessive retries:0
    Invalid misc:0
    Missed beacon:0
    It looks like you don't have anything configured for wireless yet. You might try this link. It will tell you how to install the firmware to get your wireless card working. Feel free to ask any questions if anything is confusing or not working.

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