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Thread: Wired internet connection drops randomly

  1. #1
    Join Date
    Dec 2011
    Beans
    21

    Wired internet connection drops randomly

    Hi,

    I'm running Ubuntu 12.04 on an HP 6730b laptop. Sometimes my wired internet access just drops. I can get it back by simply rebooting, but I haven't found any other way (disable/enable network or restarting network manager doesn't help).

    This has happened two times now within one week. Not too much, but since I have to reboot it's quiet annoying.

    Some more info:

    - I can ping 127.0.0.1 but not external websites

    - Both LEDs at the ethernet connector are active (green is lit, orange is blinking irregularly)

    - I tried disabling ipv6 (by doing this: http://www.noobslab.com/2012/05/disa...ternet-is.html), didn't help

    - When the wired connection has dropped, if I enable wireless, the wireless connection works fine

    I have attached the output of a number of terminal commands under this message that might give you guys some info. These commands were run when the connection had been dropped (and before I rebooted).

    Thanks, Carl

    Code:
    $ uname -a
    Linux my-laptop 3.2.0-29-generic-pae #46-Ubuntu SMP Fri Jul 27 17:25:43 UTC 2012 i686 i686 i386 GNU/Linux
    $ 
    $ 
    $ lspci -nnk | grep -iA2 net
    02:00.0 Network controller [0280]: Intel Corporation PRO/Wireless 5100 AGN [Shiloh] Network Connection [8086:4237]
    	Subsystem: Intel Corporation WiFi Link 5100 AGN [8086:1211]
    	Kernel driver in use: iwlwifi
    --
    85:00.0 Ethernet controller [0200]: Broadcom Corporation NetLink BCM5787M Gigabit Ethernet PCI Express [14e4:1693] (rev 02)
    	Subsystem: Hewlett-Packard Company Device [103c:30dd]
    	Kernel driver in use: tg3
    $ 
    $ 
    $ lsmod
    Module                  Size  Used by
    btusb                  17912  2 
    rfcomm                 38139  16 
    bnep                   17830  2 
    bluetooth             158438  23 btusb,rfcomm,bnep
    dm_crypt               22528  0 
    binfmt_misc            17292  1 
    snd_hda_codec_analog    75395  1 
    snd_hda_intel          32765  2 
    snd_hda_codec         109562  2 snd_hda_codec_analog,snd_hda_intel
    snd_hwdep              13276  1 snd_hda_codec
    snd_pcm                80845  2 snd_hda_intel,snd_hda_codec
    snd_seq_midi           13132  0 
    snd_rawmidi            25424  1 snd_seq_midi
    snd_seq_midi_event     14475  1 snd_seq_midi
    snd_seq                51567  2 snd_seq_midi,snd_seq_midi_event
    snd_timer              28931  2 snd_pcm,snd_seq
    arc4                   12473  2 
    snd_seq_device         14172  3 snd_seq_midi,snd_rawmidi,snd_seq
    uvcvideo               67203  0 
    videodev               86588  1 uvcvideo
    joydev                 17393  0 
    tpm_infineon           17296  0 
    snd                    62064  13 snd_hda_codec_analog,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
    iwlwifi               291907  0 
    soundcore              14635  1 snd
    snd_page_alloc         14108  2 snd_hda_intel,snd_pcm
    hp_accel               25728  0 
    psmouse                72919  0 
    lis3lv02d              19268  1 hp_accel
    hp_wmi                 13652  0 
    serio_raw              13027  0 
    sparse_keymap          13658  1 hp_wmi
    input_polldev          13648  1 lis3lv02d
    mac80211              436455  1 iwlwifi
    cfg80211              178679  2 iwlwifi,mac80211
    mac_hid                13077  0 
    tpm_tis                18308  0 
    ppdev                  12849  0 
    parport_pc             32114  1 
    lp                     17455  0 
    parport                40930  3 ppdev,parport_pc,lp
    firewire_ohci          40172  0 
    firewire_core          56906  1 firewire_ohci
    crc_itu_t              12627  1 firewire_core
    tg3                   141369  0 
    wmi                    18744  1 hp_wmi
    i915                  414739  3 
    drm_kms_helper         45466  1 i915
    drm                   197692  4 i915,drm_kms_helper
    i2c_algo_bit           13199  1 i915
    video                  19068  1 i915
    $ 
    $ 
    $ cat /etc/resolv.conf
    # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
    #     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
    nameserver 127.0.0.1
    $ 
    $ 
    $ ifconfig -a
    eth0      Link encap:Ethernet  HWaddr 00:25:b3:5b:f9:d3  
              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:17 
    
    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:352221 errors:0 dropped:0 overruns:0 frame:0
              TX packets:352221 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:0 
              RX bytes:72775884 (72.7 MB)  TX bytes:72775884 (72.7 MB)
    
    wlan0     Link encap:Ethernet  HWaddr 00:22:fa:ec:20:28  
              BROADCAST MULTICAST  MTU:1500  Metric:1
              RX packets:31220 errors:0 dropped:0 overruns:0 frame:0
              TX packets:25120 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:34701734 (34.7 MB)  TX bytes:3582954 (3.5 MB)
    
    $ 
    $ 
    $ rfkill list
    0: hp-wifi: Wireless LAN
    	Soft blocked: yes
    	Hard blocked: no
    1: hp-bluetooth: Bluetooth
    	Soft blocked: no
    	Hard blocked: no
    2: phy0: Wireless LAN
    	Soft blocked: yes
    	Hard blocked: yes
    5: hci0: Bluetooth
    	Soft blocked: no
    	Hard blocked: no
    $ 
    $ 
    $ iwconfig
    lo        no wireless extensions.
    
    wlan0     IEEE 802.11abgn  ESSID:off/any  
              Mode:Managed  Access Point: Not-Associated   Tx-Power=off   
              Retry  long limit:7   RTS thr:off   Fragment thr:off
              Power Management:off
              
    eth0      no wireless extensions.
    
    $ 
    $ 
    
    $ dmesg -T|egrep 'eth0|wlan0'
    [all output here has time stamps > 2 days, so they shouldn't be related to the problem]
    
    $ cat /var/lib/NetworkManager/NetworkManager.state
    
    [main]
    NetworkingEnabled=true
    WirelessEnabled=false
    WWANEnabled=true
    $

  2. #2
    Join Date
    Nov 2008
    Beans
    555
    Distro
    Ubuntu 10.04 Lucid Lynx

    Re: Wired internet connection drops randomly

    Have you tried another cable?
    Get the power Don't dig any deeper.Fight the evil.

  3. #3
    Join Date
    Feb 2008
    Location
    Planet earth, for now.
    Beans
    Hidden!
    Distro
    Xubuntu

  4. #4
    Join Date
    Dec 2011
    Beans
    21

    Re: Wired internet connection drops randomly

    The machine is three years old.

    No, I haven't tried another cable and I can't exchange it easily. But since a reboot helps, I wouldn't suspect the cable.

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