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Thread: Internet connection drops, network remains

  1. #1
    Join Date
    Jul 2007
    Location
    USA
    Beans
    194
    Distro
    Ubuntu 13.10 Saucy Salamander

    Internet connection drops, network remains

    I have an interesting issue.

    It seems my router configuration is working for other computers on my network (Windows and Mac), but not Ubuntu. I have tried to access it with my built-in wireless (Intel AC-7260) and a USB adapter (Edimax EW-7811Un).

    When I connect to the network (WIFIHICKS), I am able to use it for anywhere between 30 seconds to a few minutes. After some amount of time (seemingly random), I lose the internet connection (and connection to the router web interface as well as any network activity), but am still connected to the network via the network manager.

    This is the only network I have these issues with, and no one in my house seems to have the same issues. I am running a System76 computer, and don't have Windows installed, so I'm not able to test that.

    Right now, I have another router plugged into the cable one (from Charter), and am running successfully off that.

    1 ) Machine Brand and Model (PC/Laptop):
    Code:
    System76 Gazelle Pro
    2 ) Wireless Brand, Model and Wireless Chipset:
    Code:
    03:00.0 Network controller: Intel Corporation Wireless 7260 (rev 73)
    ifconfig and iwconfig while working:
    Code:
    jon@jon-Gazelle-Pro:~$ ifconfig wlan0
    wlan0     Link encap:Ethernet  HWaddr 0c:8b:fd:5f:25:5d  
              inet addr:192.168.0.12  Bcast:192.168.0.255  Mask:255.255.255.0
              inet6 addr: fe80::e8b:fdff:fe5f:255d/64 Scope:Link
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:13359 errors:0 dropped:0 overruns:0 frame:0
              TX packets:10604 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:10563687 (10.5 MB)  TX bytes:2044576 (2.0 MB)
    
    jon@jon-Gazelle-Pro:~$ iwconfig wlan0
    wlan0     IEEE 802.11abgn  ESSID:"WIFIHICKS"  
              Mode:Managed  Frequency:2.412 GHz  Access Point: 7C:E9:D3:8C:35:03   
              Bit Rate=115.6 Mb/s   Tx-Power=0 dBm   
              Retry  long limit:7   RTS thr:off   Fragment thr:off
              Power Management:off
              Link Quality=53/70  Signal level=-57 dBm  
              Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
              Tx excessive retries:51  Invalid misc:41   Missed beacon:0
    ifconfig and iwconfig after it stops working
    Code:
    jon@jon-Gazelle-Pro:~$ ifconfig wlan0
    wlan0     Link encap:Ethernet  HWaddr 0c:8b:fd:5f:25:5d  
              inet addr:192.168.0.12  Bcast:192.168.0.255  Mask:255.255.255.0
              inet6 addr: fe80::e8b:fdff:fe5f:255d/64 Scope:Link
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:15362 errors:0 dropped:0 overruns:0 frame:0
              TX packets:12156 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:12265923 (12.2 MB)  TX bytes:2419124 (2.4 MB)
    
    jon@jon-Gazelle-Pro:~$ iwconfig wlan0
    wlan0     IEEE 802.11abgn  ESSID:"WIFIHICKS"  
              Mode:Managed  Frequency:2.412 GHz  Access Point: 7C:E9:D3:8C:35:03   
              Bit Rate=104 Mb/s   Tx-Power=0 dBm   
              Retry  long limit:7   RTS thr:off   Fragment thr:off
              Power Management:off
              Link Quality=51/70  Signal level=-59 dBm  
              Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
              Tx excessive retries:671  Invalid misc:56   Missed beacon:0

    dmesg output:
    Code:
    [ 2447.267672] wlan0: authenticate with 7c:e9:d3:8c:35:03
    [ 2447.268380] wlan0: send auth to 7c:e9:d3:8c:35:03 (try 1/3)
    [ 2447.270355] wlan0: authenticated
    [ 2447.271596] wlan0: associate with 7c:e9:d3:8c:35:03 (try 1/3)
    [ 2447.274838] wlan0: RX AssocResp from 7c:e9:d3:8c:35:03 (capab=0x411 status=0 aid=2)
    [ 2447.275762] wlan0: associated
    6 ) Network configuration
    Code:
    jon@jon-Gazelle-Pro:~$ sudo lshw -C network
      *-network               
           description: Wireless interface
           product: Wireless 7260
           vendor: Intel Corporation
           physical id: 0
           bus info: pci@0000:03:00.0
           logical name: wlan0
           version: 73
           serial: 0c:8b:fd:5f:25:5d
           width: 64 bits
           clock: 33MHz
           capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
           configuration: broadcast=yes driver=iwlwifi driverversion=3.11.0-18-generic firmware=22.1.7.0 ip=192.168.0.12 latency=0 link=yes multicast=yes wireless=IEEE 802.11abgn
           resources: irq:47 memory:f7d00000-f7d01fff
    Ubuntu 13.10
    3.11.0-18-generic x86_64

  2. #2
    Join Date
    Mar 2010
    Location
    India
    Beans
    7,361
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: Internet connection drops, network remains

    Quote Originally Posted by ace214 View Post
    ..my built-in wireless (Intel AC-7260) and a USB adapter (Edimax EW-7811Un).
    ...<snip>...
    3.11.0-18-generic x86_64
    I get it that you are probably experiencing it on the USB adapter as well, but for the internal card, please try (based on a recent experience in this thread) -
    Code:
    sudo modprobe -rv iwlmvm
    sudo modprobe -v iwlmvm power_scheme=1
    This will be a temporary change that will be lost at next boot. Try the stability without rebooting and if it seems to help, make it permanent as mentioned in the above linked thread (post #9).

    If that doesn't help, also try it along with some other parameters -
    Code:
    sudo modprobe -rv iwlmvm
    sudo modprobe -v iwlwifi bt_coex_active=N swcrypto=1 11n_disable=1
    sudo modprobe -v iwlmvm power_scheme=1
    The "11n_disable=1" parameter will disable the N-speeds, so you may wish to omit that unless it is really required.

    To have a better understanding of what these parameters do and how to try them, please read the post #9 in the above linked thread. And please let us know if any of these works.
    Varun
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  3. #3
    Join Date
    Jul 2007
    Location
    USA
    Beans
    194
    Distro
    Ubuntu 13.10 Saucy Salamander

    Re: Internet connection drops, network remains

    Quote Originally Posted by varunendra View Post
    The "11n_disable=1" parameter will disable the N-speeds, so you may wish to omit that unless it is really required.
    Hmm... Unfortunately, this was the only one that worked. Is there a way to disable it for this connection only? I'm not sure if I come in contact with other N-rated networks.

  4. #4
    Join Date
    Mar 2010
    Location
    India
    Beans
    7,361
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: Internet connection drops, network remains

    The parameters suggested above will become permanent ONLY if you create a .conf file with them. The method suggested in my previous post loads them only temporarily (for one session or during one driver unload-reload cycle). So it would already be ineffective if you try connecting to another network after a reboot (or after reloading the driver without parameters).

    By rebooting or by reloading the driver without parameters (the parts highlighted in bold/colour), the driver will load with full support. Although if the other networks don't have support for N-channel, there is no point in enabling it.

    However, if you have made it permanent following post #9 of the previously linked thread, and now wish to make it temporary again, simply delete that .conf file(s) you created -
    Code:
    sudo rm /etc/modprobe.d/iwlwifi.conf
    Varun
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