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Thread: 12.04 wireless connected but no connection to network

  1. #1
    Join Date
    Feb 2009
    Location
    Nyon - CH
    Beans
    11
    Distro
    Kubuntu

    12.04 wireless connected but no connection to network

    Hi all,

    I have a very weird case which i tried solving by browsing this and other forums and howtos. But i can't find anything similar.

    The difference is that i know the wireless connection works on a specific wireless access point, but not on another one. But other devices connect fine to the second access point.

    What's more, during the installation process it seems to work fine. I've tested a new installation and it's still not changed (even tried with KUbuntu, but it's the same).

    Here's some code:

    lspci -nnk
    Code:
    $ lspci -nnk | grep -iA2 net
    00:19.0 Ethernet controller [0200]: Intel Corporation 82567LM Gigabit Network Connection [8086:10f5] (rev 03)
            Subsystem: Dell Device [1028:024d]
            Kernel driver in use: e1000e
    --
    0c:00.0 Network controller [0280]: Intel Corporation WiFi Link 5100 [8086:4232]
            Subsystem: Intel Corporation WiFi Link 5100 AGN [8086:1321]
            Kernel driver in use: iwlwifi
    ifconfig
    Code:
    eth0      Link encap:Ethernet  HWaddr 00:26:b9:d0:c7:cb  
              UP BROADCAST MULTICAST  MTU:1500  Metric:1
              RX packets:0 errors:0 dropped:0 overruns:0 frame:0
              TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
              Interrupt:22 Memory:f6ae0000-f6b00000 
    
    lo        Link encap:Local Loopback  
              inet addr:127.0.0.1  Mask:255.0.0.0
              inet6 addr: ::1/128 Scope:Host
              UP LOOPBACK RUNNING  MTU:16436  Metric:1
              RX packets:4419 errors:0 dropped:0 overruns:0 frame:0
              TX packets:4419 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:0 
              RX bytes:295790 (295.7 KB)  TX bytes:295790 (295.7 KB)
    
    wlan0     Link encap:Ethernet  HWaddr 00:24:d6:87:84:00  
              inet addr:192.168.1.35  Bcast:192.168.1.255  Mask:255.255.255.0
              inet6 addr: fe80::224:d6ff:fe87:8400/64 Scope:Link
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:5536 errors:0 dropped:0 overruns:0 frame:0
              TX packets:6741 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:2629058 (2.6 MB)  TX bytes:2226396 (2.2 MB)
    ping 192.168.1.1 (gw)
    Code:
    $ ping 192.168.1.1 -c4
    PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
    
    --- 192.168.1.1 ping statistics ---
    4 packets transmitted, 0 received, 100% packet loss, time 2999ms
    route -n
    Code:
    $ route -n
    Kernel IP routing table
    Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
    0.0.0.0         192.168.1.1     0.0.0.0         UG    0      0        0 wlan0
    169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 wlan0
    192.168.1.0     0.0.0.0         255.255.255.0   U     2      0        0 wlan0
    iwconfig
    Code:
    lo        no wireless extensions.
    
    wlan0     IEEE 802.11abgn  ESSID:"katewyfy"  
              Mode:Managed  Frequency:2.437 GHz  Access Point: 00:02:CF:EF:2D:98   
              Bit Rate=13.5 Mb/s   Tx-Power=15 dBm   
              Retry  long limit:7   RTS thr:off   Fragment thr:off
              Power Management:off
              Link Quality=47/70  Signal level=-63 dBm  
              Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
              Tx excessive retries:0  Invalid misc:0   Missed beacon:0
    
    eth0      no wireless extensions.
    nm-tool
    Code:
    NetworkManager Tool
    
    State: connected (global)
    
    - Device: wlan0  [katewyfy] ----------------------------------------------------
      Type:              802.11 WiFi
      Driver:            iwlwifi
      State:             connected
      Default:           yes
      HW Address:        00:24:D6:87:84:00
    
      Capabilities:
        Speed:           121 Mb/s
    
      Wireless Properties
        WEP Encryption:  yes
        WPA Encryption:  yes
        WPA2 Encryption: yes
    
      Wireless Access Points (* = current AP)
        vinci:           Infra, 00:19:E3:FB:93:DB, Freq 2462 MHz, Rate 54 Mb/s, Strength 85 WPA WPA2
        wireless-cassowary: Infra, 00:24:37:04:C5:30, Freq 2462 MHz, Rate 54 Mb/s, Strength 84 WPA WPA2
        fdi-85550:       Infra, 00:24:93:02:61:20, Freq 2427 MHz, Rate 54 Mb/s, Strength 82 WPA WPA2
        dyy-83591:       Infra, 00:24:37:B1:87:00, Freq 2442 MHz, Rate 54 Mb/s, Strength 69 WPA WPA2
        orj-40411:       Infra, 00:24:C8:6A:77:30, Freq 2447 MHz, Rate 54 Mb/s, Strength 44 WPA WPA2
        iks-03429:       Infra, DC:0B:1A:AF:7C:B9, Freq 2412 MHz, Rate 54 Mb/s, Strength 42 WPA WPA2
        slx-23794:       Infra, 64:87:D7:28:45:09, Freq 2412 MHz, Rate 54 Mb/s, Strength 40 WPA WPA2
        Paulino:         Infra, E0:46:9A:8D:42:22, Freq 2412 MHz, Rate 54 Mb/s, Strength 40 WPA2
        PJI-65914:       Infra, 00:26:42:16:6E:B0, Freq 2447 MHz, Rate 54 Mb/s, Strength 34 WPA WPA2
        ucb-29174:       Infra, 64:87:D7:02:0A:B9, Freq 2462 MHz, Rate 54 Mb/s, Strength 30 WPA WPA2
        cestdelaballe:   Infra, 50:67:F0:53:DA:38, Freq 2417 MHz, Rate 54 Mb/s, Strength 30 WPA WPA2
        isamota:         Infra, 00:24:93:2B:8A:60, Freq 2467 MHz, Rate 54 Mb/s, Strength 30 WPA WPA2
        FRITZ!Box Fon WLAN 7390: Infra, C0:25:06:D5:7D:11, Freq 2412 MHz, Rate 54 Mb/s, Strength 30 WPA WPA2
        traitotraito:    Infra, 00:1B:11:61:3F:2B, Freq 2452 MHz, Rate 54 Mb/s, Strength 29 WPA2
        WBN2:            Infra, C0:C1:C0:30:59:36, Freq 2412 MHz, Rate 54 Mb/s, Strength 27 WPA
        ydw-34783:       Infra, 00:24:37:0E:ED:A0, Freq 2472 MHz, Rate 54 Mb/s, Strength 27 WPA WPA2
        lyj-33474:       Infra, 00:24:37:B7:8B:F0, Freq 2427 MHz, Rate 54 Mb/s, Strength 27 WPA WPA2
        ldy-12588:       Infra, 64:87:D7:39:2A:B9, Freq 2462 MHz, Rate 54 Mb/s, Strength 27 WPA WPA2
        Simmit_Network:  Infra, B8:C7:5D:09:59:A1, Freq 2437 MHz, Rate 54 Mb/s, Strength 27 WPA2
        LRI-58808:       Infra, 64:87:D7:00:9D:39, Freq 2412 MHz, Rate 54 Mb/s, Strength 25 WPA WPA2
        fuz-46863:       Infra, 00:24:C8:52:2C:80, Freq 2412 MHz, Rate 54 Mb/s, Strength 24 WPA WPA2
        Medical_Oceane:  Infra, 00:26:42:19:0C:D0, Freq 2427 MHz, Rate 54 Mb/s, Strength 24 WPA WPA2
        voa-38624:       Infra, 00:24:37:84:69:10, Freq 2472 MHz, Rate 54 Mb/s, Strength 22 WPA WPA2
        XXI-49559:       Infra, 00:21:43:5D:6E:D0, Freq 2472 MHz, Rate 54 Mb/s, Strength 19 WPA WPA2
        Internet:        Infra, 00:0F:CC:F8:9D:B4, Freq 2442 MHz, Rate 54 Mb/s, Strength 27 WEP
        Marco:           Infra, 00:26:5A:20:B6:A0, Freq 2457 MHz, Rate 54 Mb/s, Strength 22 WEP
        ZyXEL:           Infra, CC:5D:4E:2E:9E:1C, Freq 2442 MHz, Rate 54 Mb/s, Strength 32
        *katewyfy:       Infra, 00:02:CF:EF:2D:98, Freq 2437 MHz, Rate 54 Mb/s, Strength 61 WPA
    
      IPv4 Settings:
        Address:         192.168.1.35
        Prefix:          24 (255.255.255.0)
        Gateway:         192.168.1.1
    
        DNS:             91.233.182.2
        DNS:             194.230.1.39
    
    
    - Device: eth0 -----------------------------------------------------------------
      Type:              Wired
      Driver:            e1000e
      State:             unavailable
      Default:           no
      HW Address:        00:26:B9:D0:C7:CB
    
      Capabilities:
        Carrier Detect:  yes
    
      Wired Properties
        Carrier:         off
    rfkill list all
    Code:
    $ sudo rfkill list all
    0: phy0: Wireless LAN
            Soft blocked: no
            Hard blocked: no
    1: dell-wifi: Wireless LAN
            Soft blocked: no
            Hard blocked: no
    2: dell-bluetooth: Bluetooth
            Soft blocked: no
            Hard blocked: no
    3: hci0: Bluetooth
            Soft blocked: no
            Hard blocked: no
    There's not much i can think of...

    Before i go travelling, i'd like to know if it's an issue with this router or something more general which might happen with older routers (probably having them in Africa)
    Last edited by mgerber; August 14th, 2012 at 05:17 PM. Reason: not complete

  2. #2
    Join Date
    Aug 2005
    Location
    South Carolina, USA
    Beans
    22,517
    Distro
    Ubuntu 16.04 Xenial Xerus

    Re: 12.04 wireless connected but no connection to network

    As a temporary experiment, please try:
    Code:
    sudo modprobe -r iwlwifi
    sudo modprobe iwlwifi 11n_disable=1
    Any improvement?
    "Oh, Ubuntu, you are my favorite Linux-based operating system" --Dr. Sheldon Cooper, Ph.D.

  3. #3
    Join Date
    Feb 2009
    Location
    Nyon - CH
    Beans
    11
    Distro
    Kubuntu

    Re: 12.04 wireless connected but no connection to network

    It works great !! thanks.

    How can i do the setting permanently ?

    Do you know why this setting prevents wireless from working ?

  4. #4
    Join Date
    Aug 2005
    Location
    South Carolina, USA
    Beans
    22,517
    Distro
    Ubuntu 16.04 Xenial Xerus

    Re: 12.04 wireless connected but no connection to network

    Quote Originally Posted by mgerber View Post
    It works great !! thanks.

    How can i do the setting permanently ?

    Do you know why this setting prevents wireless from working ?
    There is a long-standing bug somewhere in the driver iwlwifi and, for that matter, its predecessor iwlagn.

    Here is the step that makes it persistent:
    Code:
    sudo gedit /etc/modprobe.d/iwlwifi.conf
    Add a single line:
    Code:
    options iwlwifi 11n_disable=1
    Use leafpad, kate, vim or any text editor if you don't have gedit. Proofread, save and close gedit.

    Please use thread tools at the top to mark Solved.
    "Oh, Ubuntu, you are my favorite Linux-based operating system" --Dr. Sheldon Cooper, Ph.D.

  5. #5
    Join Date
    Feb 2009
    Location
    Nyon - CH
    Beans
    11
    Distro
    Kubuntu

    Re: 12.04 wireless connected but no connection to network

    Very nice

    Thanks !

  6. #6
    Join Date
    Aug 2008
    Beans
    108

    Re: 12.04 wireless connected but no connection to network

    Hey, sorry to reopen an old post. I am visiting my parents for the holidays and was having this same issue. This solved it. However, I am not having these issues at home or at work. Will making these changes permanent cause any problems with connections that were previously working fine?

  7. #7
    Join Date
    Aug 2005
    Location
    South Carolina, USA
    Beans
    22,517
    Distro
    Ubuntu 16.04 Xenial Xerus

    Re: 12.04 wireless connected but no connection to network

    Quote Originally Posted by stangdaman View Post
    Hey, sorry to reopen an old post. I am visiting my parents for the holidays and was having this same issue. This solved it. However, I am not having these issues at home or at work. Will making these changes permanent cause any problems with connections that were previously working fine?
    Not really.It will simply disallow traffic at N speeds. You may have trouble if you intend to stream Blu-Ray from a media server, or other extremely high density media, but probably not otherwise.
    "Oh, Ubuntu, you are my favorite Linux-based operating system" --Dr. Sheldon Cooper, Ph.D.

  8. #8
    Join Date
    Sep 2011
    Beans
    52
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: 12.04 wireless connected but no connection to network

    Quote Originally Posted by chili555 View Post
    As a temporary experiment, please try:
    Code:
    sudo modprobe -r iwlwifi
    sudo modprobe iwlwifi 11n_disable=1
    Any improvement?

    Thank you Chili.

  9. #9
    Join Date
    Aug 2008
    Beans
    108

    Re: 12.04 wireless connected but no connection to network

    Delayed thank you by the way.

    So, if I want to go back to n speeds I can just remove the file or can I even just comment out that line in the file so that if I want to use it again at a later time, next time I'm at their house, I can?

  10. #10
    Join Date
    Aug 2005
    Location
    South Carolina, USA
    Beans
    22,517
    Distro
    Ubuntu 16.04 Xenial Xerus

    Re: 12.04 wireless connected but no connection to network

    If you remove the file or comment out the line, I suspect you will go back to:
    and was having this same issue.
    You could certainly try and report your results.
    "Oh, Ubuntu, you are my favorite Linux-based operating system" --Dr. Sheldon Cooper, Ph.D.

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