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Thread: Sudden internet failure

  1. #1

    Default Sudden internet failure

    Hi,

    Been searching around for people with a similar problem for a couple of weeks now, with no hint at a solution. I installed virtual box, had the internet running for a couple of days, then nothing! I've been through the network configuration process (with ifup) and ensured things are set at default, and using DHCP (I'm getting the web through university LAN), and the cable is attached, but nothing! Does anybody know how to go about troubleshooting this issue, or what it could be?

    Tom

  2. #2
    Join Date
    Sep 2010
    Location
    Poland
    Posts
    1,970

    Default Re: Sudden internet failure

    Quote Originally Posted by tomant View Post
    Hi,

    Been searching around for people with a similar problem for a couple of weeks now, with no hint at a solution. I installed virtual box, had the internet running for a couple of days, then nothing! I've been through the network configuration process (with ifup) and ensured things are set at default, and using DHCP (I'm getting the web through university LAN), and the cable is attached, but nothing! Does anybody know how to go about troubleshooting this issue, or what it could be?

    Tom
    Hi and a warm welcome to the forums

    For start please paste the output of this terminal commands here :
    Code:
    cat /etc/resolv.conf
    Code:
    /sbin/ifconfig
    The first one will tell us something about your DNS and the second one about interfaces and the ip addresses You get.

    Please wrap the output with code tags. Here's a tutorial on how to do this :
    Posting in Code Tags - A Guide

    It will produce a much easier to read post.

    Best regards,
    Greg
    Best regards,
    Greg

  3. #3

    Default Re: Sudden internet failure

    Quote Originally Posted by tomant View Post
    I installed virtual box, had the internet running for a couple of days, then nothing!

    Tom
    Do you have openSuse installed in a Virtual Machine or did you install Virtual Box in a local openSuse install?

    Quote Originally Posted by glistwan
    Please wrap the output with code tags. Here's a tutorial on how to do this :
    Posting in Code Tags - A Guide
    Life just got easier, thank you

    Can you ping to the router (assuming 192.168.0.1) or to an outside source (8.8.8.8).
    Vaio F11: i7-720QM 8GB RAM Nvidia GT 330m
    Win 7 Pro 64 bit | openSuse 11.4 64 bit | Arch Linux 64 bit

  4. #4

    Default Re: Sudden internet failure

    Hi

    Thanks for the quick respose. This is the output from my terminal:

    Code:
    tom@linux-1dio:~> cat /etc/resolv.conf
    ### /etc/resolv.conf file autogenerated by netconfig!
    #
    # Before you change this file manually, consider to define the
    # static DNS configuration using the following variables in the
    # /etc/sysconfig/network/config file:
    #     NETCONFIG_DNS_STATIC_SEARCHLIST
    #     NETCONFIG_DNS_STATIC_SERVERS
    #     NETCONFIG_DNS_FORWARDER
    # or disable DNS configuration updates via netconfig by setting:
    #     NETCONFIG_DNS_POLICY=''
    #
    # See also the netconfig(8) manual page and other documentation.
    #
    # Note: Manual change of this file disables netconfig too, but
    # may get lost when this file contains comments or empty lines
    # only, the netconfig settings are same with settings in this
    # file and in case of a "netconfig update -f" call.
    #
    ### Please remove (at least) this line when you modify the file!
    Code:
    linux-1dio:/home/tom # ifconfig
    eth0      Link encap:Ethernet  HWaddr 20:CF:30:85:7B:FD  
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:25544 errors:0 dropped:644 overruns:0 frame:0
              TX packets:77 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:2640925 (2.5 Mb)  TX bytes:26334 (25.7 Kb)
              Interrupt:53 Base address:0xe000 
    
    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:165 errors:0 dropped:0 overruns:0 frame:0
              TX packets:165 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:0 
              RX bytes:22236 (21.7 Kb)  TX bytes:22236 (21.7 Kb)
    Also virtualbox was installed on my local machine. When I try to ping, I get
    Code:
    connect: Network is unreachable
    Under Network Status, I also have none, click to configure network, but I have, and running through the standard config setup, nothing happens when it's done! Weird

  5. #5
    Join Date
    Sep 2010
    Location
    Poland
    Posts
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    Default Re: Sudden internet failure

    You have got no IP address configured and no DNS servers. This just can't work.

    What do You get when You try to restart the network service ?
    Code:
    /etc/init.d/network restart
    You need to run this as root.

    Best regards,
    Greg
    Best regards,
    Greg

  6. #6

    Default Re: Sudden internet failure

    This is the result from network restart and ifconfig

    Code:
    /etc/init.d/network restart
    Shutting down network interfaces:
        eth0      device: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 03)
        eth0                                              done
    Shutting down service network  .  .  .  .  .  .  .  . done
    Hint: you may set mandatory devices in /etc/sysconfig/network/config
    Setting up network interfaces:
        eth0      device: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 03)
        eth0      is controlled by ifplugd
        eth0                                              waiting
    Setting up service network  .  .  .  .  .  .  .  .  . done
    linux-1dio:/home/tom # ifconfig
    eth0      Link encap:Ethernet  HWaddr 20:CF:30:85:7B:FD  
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:1368673 errors:0 dropped:20864 overruns:0 frame:0
              TX packets:3836 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:139444817 (132.9 Mb)  TX bytes:1311912 (1.2 Mb)
              Interrupt:53 Base address:0xe000 
    
    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:2421 errors:0 dropped:0 overruns:0 frame:0
              TX packets:2421 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:0 
              RX bytes:167268 (163.3 Kb)  TX bytes:167268 (163.3 Kb)
    
    linux-1dio:/home/tom #
    So still no IP! I'm configured to get an IP via DHCP.

    Cheers.

  7. #7
    Join Date
    Jun 2008
    Location
    Kansas City Area, Missouri, USA
    Posts
    7,236

    Default Re: Sudden internet failure

    On 05/11/2011 11:06 AM, tomant wrote:
    > eth0 Link encap:Ethernet HWaddr 20:CF:30:85:7B:FD
    > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
    > RX packets:1368673 errors:0 dropped:20864 overruns:0 frame:0
    > TX packets:3836 errors:0 dropped:0 overruns:0 carrier:0
    > collisions:0 txqueuelen:1000
    > RX bytes:139444817 (132.9 Mb) TX bytes:1311912 (1.2 Mb)
    > Interrupt:53 Base address:0xe000


    There are a lot of RX packets for never having gotten an IP. Are you sure you
    don't have a cable problem that is generating noise?


  8. #8

    Default Re: Sudden internet failure

    In Yast, when is your ethernet card set to turn on? Manually? On Boot?
    Also, does just requesting an IP address fix anything?
    Code:
    dhcpcd eth0
    Vaio F11: i7-720QM 8GB RAM Nvidia GT 330m
    Win 7 Pro 64 bit | openSuse 11.4 64 bit | Arch Linux 64 bit

  9. #9

    Default Re: Sudden internet failure

    Its not a cable problem. The cable works fine in this Windows 7 laptop I'm using!

    Ethernet card set to turn on on cable connection... Using that command to request an IP doesn't do anything, still no network.

  10. #10
    Join Date
    Sep 2010
    Location
    Poland
    Posts
    1,970

    Default Re: Sudden internet failure

    This is very strange indeed. Could You tell us what is the contents of these files ?

    Code:
    cat /etc/sysconfig/network/dhcp
    Code:
    cat /etc/sysconfig/network/ifcfg-eth0
    Best regards,
    Greg
    Best regards,
    Greg

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