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Thread: Can't connect to wired ethernet following 10.04LTS to 12.04LTS upgrade

  1. #1
    Join Date
    Mar 2013
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    10

    Can't connect to wired ethernet following 10.04LTS to 12.04LTS upgrade

    Hi all,

    I've upgraded from 10.04LTS to 12.04LTS on my desktop and now my ethernet connection doesn't work. The connection still works fine if I boot from the 10.04 CD but won't connect from the desktop version of 12.04. I've attached ifconfig output from both.

    I can successfully ping the router and the response time is pretty much the same from the 10.04 CD boot as from the 12.04 desktop. There is no packet loss in 12.04. However, I can't view the router's set up menu or anything beyond it in Firefox.

    I don't have wireless on the desktop so I can't check for software updates from that computer (I'm posting from my work laptop).

    Assistance would be most welcome.

    Cheers
    Attached Files Attached Files

  2. #2
    Join Date
    Jul 2010
    Location
    ozarks, Arkansas, USA
    Beans
    6,549
    Distro
    Lubuntu 14.04 Trusty Tahr

    Re: Can't connect to wired ethernet following 10.04LTS to 12.04LTS upgrade

    Spacecoaster; Hi ! Welcome to the forum.

    You have the same IP address on both boxes - no can do, confuses the router muchly.[both connected to router ???]
    Try this:
    12.04 : right click on the connections icon in the task bar ->choose edit connections;
    click on your wired connection ->edit;
    wired: MTU = Automatic
    ipv4 settings: -> set in methods box : Automatic (DHCP) and "available to all users" check box (lower left corner) checked.
    ipv6 settings: -> Automatic and ditto on available to all users.
    Reboot for the changes to take effect.
    ------------
    I expect then that the 12.04 box will receive a new address from the router.

    just try'n to help

  3. #3
    Join Date
    Mar 2013
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    10

    Re: Can't connect to wired ethernet following 10.04LTS to 12.04LTS upgrade

    Thanks for the welcome, Bashing-om!

    Unfortunately, I've just tried your suggestion and sadly no improvement.

    I'm not sure what you mean by both boxes? There is only one box: it has 12.04 installed. However I was able to confirm that the physical ethernet connection is OK by running 10.04 on this machine directly from the old 10.04 installation disc. I guess this explains the IP addresses being the same or could this still be part of the problem?

  4. #4
    Join Date
    Jul 2010
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    ozarks, Arkansas, USA
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    Distro
    Lubuntu 14.04 Trusty Tahr

    Re: Can't connect to wired ethernet following 10.04LTS to 12.04LTS upgrade

    Spacecoaster;
    Connecting through a router ?
    Yes -> suggestion: access the router through the browser and maybe there is an option to "clone" the IP address of the computer.(that is what I had to do to get my box up on the net)

    try'n to help

  5. #5
    Join Date
    Mar 2013
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    10

    Re: Can't connect to wired ethernet following 10.04LTS to 12.04LTS upgrade

    Yes, I'm connecting through a router. Alas, I don't have control over it. It's operated by the landlord of the apartment compound I live in. I'm not making things easy, am I?!

  6. #6
    Join Date
    Jul 2010
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    ozarks, Arkansas, USA
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    6,549
    Distro
    Lubuntu 14.04 Trusty Tahr

    Re: Can't connect to wired ethernet following 10.04LTS to 12.04LTS upgrade

    Spacecoaster; If everything were "easy" we would all be babbling away in a far corner.

    OK, one step at a time, lets see if your computer can talk to the router.
    terminal code:
    Code:
    route
    returns an address(amongst other info) at the intersection of default and gateway (like 192.168.0.1)
    then from terminal talk to that router: Substitute your own gateway address in code below.
    Code:
     ping -c 3 192.168.0.1
    final result we want is: "3 packets transmitted, 3 received, 0% packet loss, time 2001ms"
    not there yet


  7. #7
    Join Date
    Mar 2013
    Beans
    10

    Re: Can't connect to wired ethernet following 10.04LTS to 12.04LTS upgrade

    Results from route
    Kernel IP routing table
    Destination Gateway Genmask Flags Metric Ref Use Iface
    default 192.168.100.1 0.0.0.0 UG 0 0 0 eth0
    link-local * 255.255.0.0 U 1000 0 0 eth0
    192.168.100.0 * 255.255.255.0 U 1 0 0 eth0

    and ping
    PING 192.168.100.1 (192.168.100.1) 56(84) bytes of data.
    64 bytes from 192.168.100.1: icmp_req=1 ttl=64 time=3.39 ms
    64 bytes from 192.168.100.1: icmp_req=2 ttl=64 time=1.01 ms
    64 bytes from 192.168.100.1: icmp_req=3 ttl=64 time=1.41 ms
    --- 192.168.100.1 ping statistics ---
    3 packets transmitted, 3 received, 0% packet loss, time 2002ms
    rtt min/avg/max/mdev = 1.010/1.938/3.394/1.042 ms

    Ping result seems to be pretty close to what you were expecting, Bashing-om. I hope this is a good sign!

  8. #8
    Join Date
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    Re: Can't connect to wired ethernet following 10.04LTS to 12.04LTS upgrade

    Spacecoaster;
    That looks promising with confirmation you are getting out of your computer and talking to the router. Most likely now just a matter of configurations. Let's see that DNS (domain name service) lookup is functioning:

    Code:
     ping -c 3 74.125.225.232
    ping -c 3 google.com
    If the IP returns and the name does not, then we need to give the network manager a domain name.

    we stepp'n

  9. #9
    Join Date
    Mar 2013
    Beans
    10

    Re: Can't connect to wired ethernet following 10.04LTS to 12.04LTS upgrade

    Yes, the IP returns but the name does not (it returns unknown host google.com). How do we give network manager a domain name?

  10. #10
    Join Date
    Feb 2009
    Location
    Dallas, TX
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    Distro
    Ubuntu 14.04 Trusty Tahr

    Re: Can't connect to wired ethernet following 10.04LTS to 12.04LTS upgrade

    Hi Spacecoaster.

    It's looking like a DNS problem.

    Could you post the result of these commands?
    Code:
    cat /etc/resolv.conf
    
    grep dnsmasq /etc/NetworkManager/NetworkManager.conf
    
    cat /var/run/nm-dns-dnsmasq.conf
    Regards.

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