Page 1 of 3 123 LastLast
Results 1 to 10 of 30

Thread: Ethernet Connection Stopped Working

  1. #1
    Join Date
    Nov 2012
    Beans
    19

    Unhappy Ethernet Connection Stopped Working

    I have a very peculiar problem. My ethernet stopped working after a normal system shutdown. I've tried to troubleshoot all hardware related issues and found that it is not hardware related (new cable, verified bios, booted into WinXP and works).

    My /etc/network/interfaces contains\
    auto lo
    iface lo inet loopback
    Under Network Management, I've set NetworkingEnabled=true
    nm-tool says State: unavailable

    As per thread http://ubuntuforums.org/showthread.php?t=2119493, I have tried all the stuff, including removing resolvconf, yet no luck.

    When I re-boot, I see that the lights on my router port are green and at a certain point the lights go away and there is no wired connection.

    I'm using 12.10 with 3.5.0-25 kernel. Can you please help?

  2. #2
    Join Date
    Aug 2011
    Location
    Berlin, Germany
    Beans
    6,533
    Distro
    Ubuntu Gnome 14.04 Trusty Tahr

    Re: Ethernet Connection Stopped Working

    Hi,

    please show
    Code:
    lspci -nnk | grep -iA2 net
    cat /etc/resolv.conf
    route -n
    ifconfig -a
    Does it work with an earlier kernel?

  3. #3
    Join Date
    Nov 2012
    Beans
    19

    Re: Ethernet Connection Stopped Working

    Quote Originally Posted by embeehere View Post

    I'm using 12.10 with 3.5.0-25 kernel. Can you please help?
    Correction. I am using 12.04.

  4. #4
    Join Date
    Nov 2012
    Beans
    19

    Re: Ethernet Connection Stopped Working

    Quote Originally Posted by praseodym View Post
    Hi,

    please show
    Code:
    lspci -nnk | grep -iA2 net
    cat /etc/resolv.conf
    route -n
    ifconfig -a
    Does it work with an earlier kernel?
    Here it is:
    Code:
    lspci
    00:19.0 Ethernet controller [0200]: Intel Corporation 82562V 10/100 Network Connection [8086:104c] (rev 02)
            Subsystem: Dell Device [1028:01dc]
            Kernel driver in use: e1000e
    
    ifconfig -a
    eth0      Link encap:Ethernet  HWaddr 00:16:76:cf:83:b6
              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:21 Memory:dffe0000-e0000000
    
    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:16 errors:0 dropped:0 overruns:0 frame:0
              TX packets:16 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:0
              RX bytes:960 (960.0 B)  TX bytes:960 (960.0 B)
    
    resolv.conf
    # Generated by NetworkManager
    nameserver 192.168.0.1
    
    route -n
    
    Kernel IP routing table
    Destination     Gateway         Genmask         Flags Metric Ref    Use Iface

  5. #5
    Join Date
    Nov 2012
    Beans
    19

    Re: Ethernet Connection Stopped Working

    More info:

    Code:
    lshw -C network
      *-network
           description: Ethernet interface
           product: 82562V 10/100 Network Connection
           vendor: Intel Corporation
           physical id: 19
           bus info: pci@0000:00:19.0
           logical name: eth0
           version: 02
           serial: 00:16:76:cf:83:b6
           capacity: 100Mbit/s
           width: 32 bits
           clock: 33MHz
           capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd autonegotiation
           configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=2.0.0-k firmware=1.1-2 latency=0 link=no multicast=yes port=twisted pair
           resources: irq:43 memory:dffe0000-dfffffff memory:dffdb000-dffdbfff ioport:ecc0(size=32)
    
    /etc/network/interfaces
    auto lo
    iface lo inet loopback

  6. #6
    Join Date
    Nov 2012
    Beans
    19

    Re: Ethernet Connection Stopped Working

    Any help? Any body please? I am clueless and stuck at this point.

  7. #7
    Join Date
    Apr 2012
    Beans
    6,696

    Re: Ethernet Connection Stopped Working

    Did your 'route -n' output get cut off when you pasted it, or is the routing table really empty?

    Can you narrow down exactly where it's not working?

    - can you ping your gateway / router by IP?
    - can you ping an external host by IP?
    - ... external host by name?
    - etc.

    If the interface itself is not coming up you may also get some diagnostic messages in dmesg

    Code:
    dmesg | grep eth0

  8. #8
    Join Date
    Nov 2012
    Beans
    19

    Re: Ethernet Connection Stopped Working

    Quote Originally Posted by steeldriver View Post
    Did your 'route -n' output get cut off when you pasted it, or is the routing table really empty?

    Can you narrow down exactly where it's not working?

    - can you ping your gateway / router by IP?
    - can you ping an external host by IP?
    - ... external host by name?
    - etc.

    If the interface itself is not coming up you may also get some diagnostic messages in dmesg

    Code:
    dmesg | grep eth0
    route -n is actually empty

    The interface itself is not coming up. It seems like an Ethernet card does not exist on the system. So Cannot ping router/gateway; Cannot ping any external IP.

    Here is the dmesg output.
    Code:
    [    2.862019] e1000e 0000:00:19.0: eth0: (PCI Express:2.5GT/s:Width x1) 00:16:76:cf:83:b6
    [    2.862025] e1000e 0000:00:19.0: eth0: Intel(R) PRO/10/100 Network Connection
    [    2.862051] e1000e 0000:00:19.0: eth0: MAC: 6, PHY: 7, PBA No: 1021FF-0FF
    [   20.300106] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
    [   21.728514] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
    [   21.728946] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready

  9. #9
    Join Date
    Apr 2012
    Beans
    6,696

    Re: Ethernet Connection Stopped Working

    Hmm... strange that it is jumping straight to IPv6 - I have an Intel wired card using e1000e on 12.04 in one of my laptops and what I see is

    Code:
    [   11.571790] ADDRCONF(NETDEV_UP): eth0: link is not ready
    [   18.388836] ADDRCONF(NETDEV_UP): eth0: link is not ready
    [   22.065060] e1000e: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: Rx/Tx
    [   22.065297] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
    [   32.608024] eth0: no IPv6 routers present
    Is this a default wired connection or did you manually configure it via the Network Manager applet? What is the output of

    Code:
    nmcli dev list iface eth0

  10. #10
    Join Date
    Nov 2012
    Beans
    19

    Re: Ethernet Connection Stopped Working

    This is the default wired connection. This has been working without any issues for about 4 years. Never did/had to configure anything via the NM applet.

    Even today the card works on the same WinXP dual boot. What is puzzling is that the system underwent a normal shutdown. (We were expecting a power outage and our battery back-up is only for 30 mins). After about 24 hours, it was a normal boot and bingo - eth0 refuses to come alive.

    Code:
    sudo nmcli dev list iface eth0
    
    GENERAL.DEVICE:                         eth0
    GENERAL.TYPE:                           802-3-ethernet
    GENERAL.VENDOR:                         Intel Corporation
    GENERAL.PRODUCT:                        82562V 10/100 Network Connection
    GENERAL.DRIVER:                         e1000e
    GENERAL.DRIVER-VERSION:                 2.0.0-k
    GENERAL.FIRMWARE-VERSION:               1.1-2
    GENERAL.HWADDR:                         00:16:76:CF:83:B6
    GENERAL.STATE:                          20 (unavailable)
    GENERAL.REASON:                         2 (Device is now managed)
    GENERAL.UDI:                            /sys/devices/pci0000:00/0000:00:19.0/net/eth0
    GENERAL.IP-IFACE:                       
    GENERAL.NM-MANAGED:                     yes
    GENERAL.AUTOCONNECT:                    yes
    GENERAL.FIRMWARE-MISSING:               no
    GENERAL.CONNECTION:                     not connected
    CAPABILITIES.CARRIER-DETECT:            yes
    CAPABILITIES.SPEED:                     unknown
    WIRED-PROPERTIES.CARRIER:               off
    After seeing dmesg output, I went to the NM applet and selected the Wired Connection and in the IPv6 Settings tab, selected Method=Ignore. Still no luck.

Page 1 of 3 123 LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •