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Thread: Physical Ethernet Not Connecting

  1. #1
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    Physical Ethernet Not Connecting

    Bit of background first: I'm in a bit of a situation here, as I'm in China for the next 3 weeks on a summe research deal. I've been here for 5 weeks, and somewhere around the first week my ethernet port stopped working for some reason. The wireless is fine, but any connected ethernet cable doesn't work with the netbook, even if they work with other laptops or computers.

    I referred to this thread first but the solutions offered there did not help:
    http://ubuntuforums.org/showthread.php?t=1460266

    Hardware: Gateway LT20 Netbook
    Release: Ubuntu 9.1 (karmic)

    I've tried to use "sudo ifdown eth0" and "sudo ifup eth0" to "reset" it, but that didn't really do anything.

    I'm an Ubuntu newb and don't really know what else to try. I have automatic DHCP settings on, if that info helps.

    Any help would be so unbelievably appreciated; it's very frustrating having limited internet connectivity here.

  2. #2
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    Re: Physical Ethernet Not Connecting

    If I need to provide any more information tell me what and how to do it please, I really want to get this taken care of as soon as I can.

  3. #3
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    Ubuntu 10.04 Lucid Lynx

    Re: Physical Ethernet Not Connecting

    Are the lights on the ethernet port flickering or on?

    Try doing in terminal

    Code:
    # sudo /etc/init.d/networking restart
    Check in network manager as well to make sure it 'starts automatically' or whatever it is that needs to be checked.
    What's the point of a window if it can't be opened

  4. #4
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    Re: Physical Ethernet Not Connecting

    After restarting networking, check ifconfig -a. If the wired interface has no connection, try sudo dhclient eth0 (assuming the wired interface is eth0). Probably you'll get several lines ending with something like "No DHCP offers received... sleeping"
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  5. #5
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    Re: Physical Ethernet Not Connecting

    The ethernet port lights are flickering.
    I did
    Code:
    sudo /etc/init.d/networking restart
    and nothing happened/changed.

    The results of ifconfig -a yielded:
    Code:
    Link encap:Ethernet  HWaddr 00:26:22:89:a6:c3  
              inet6 addr: fe80::226:22ff:fe89:a6c3/64 Scope:Link
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:21018184 errors:0 dropped:0 overruns:0 frame:0
              TX packets:94 errors:0 dropped:0 overruns:0 carrier:3
              collisions:0 txqueuelen:1000 
              RX bytes:575557 (575.5 KB)  TX bytes:11216 (11.2 KB)
              Interrupt:29
    for eth0.

    After sudo dhclient eth0, I received:
    Code:
    There is already a pid file /var/run/dhclient.pid with pid 11819
    killed old client process, removed PID file
    Internet Systems Consortium DHCP Client V3.1.2
    Copyright 2004-2008 Internet Systems Consortium.
    All rights reserved.
    For info, please visit http://www.isc.org/sw/dhcp/
    
    Listening on LPF/eth0/00:26:22:89:a6:c3
    Sending on   LPF/eth0/00:26:22:89:a6:c3
    Sending on   Socket/fallback
    DHCPREQUEST of 192.168.0.76 on eth0 to 255.255.255.255 port 67
    DHCPACK of 192.168.0.76 from 192.168.0.1
    resolvconf: Error: /etc/resolv.conf must be a symlink
    bound to 192.168.0.76 -- renewal in 42160 seconds.
    Still nothing....

  6. #6
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    Re: Physical Ethernet Not Connecting

    Quote Originally Posted by potatohamster View Post
    Code:
    ...
    Sending on   Socket/fallback
    DHCPREQUEST of 192.168.0.76 on eth0 to 255.255.255.255 port 67
    DHCPACK of 192.168.0.76 from 192.168.0.1
    resolvconf: Error: /etc/resolv.conf must be a symlink
    bound to 192.168.0.76 -- renewal in 42160 seconds.
    Interesting error message...
    LOOKS like the machine got IP address 192.168.0.76 - ifconfig -a reports otherwise?
    Last edited by Iowan; July 22nd, 2010 at 12:09 AM.
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  7. #7
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    Re: Physical Ethernet Not Connecting

    Code:
    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:261 errors:0 dropped:0 overruns:0 frame:0
              TX packets:261 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:0 
              RX bytes:27230 (27.2 KB)  TX bytes:27230 (27.2 KB)
    
    wlan0     Link encap:Ethernet  HWaddr 90:4c:e5:a0:a7:66  
              inet addr:192.168.1.128  Bcast:192.168.1.255  Mask:255.255.255.0
              inet6 addr: fe80::924c:e5ff:fea0:a766/64 Scope:Link
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:146575 errors:0 dropped:0 overruns:0 frame:0
              TX packets:133282 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:129363968 (129.3 MB)  TX bytes:18309963 (18.3 MB)
              Interrupt:16 Memory:57100000-57110000

  8. #8
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    Re: Physical Ethernet Not Connecting

    Wow, eth0 doesn't show at all - let alone having reported IP address...

    I've never done this, but...
    try sudo dhclient -r to release the current lease, then sudo dhclient eth0 to get another one.

    man dhclient has some other good info. You can check what is in /var/lib/dhcp3/dhclient.leases.
    Last edited by Iowan; July 25th, 2010 at 02:37 PM.
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