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Thread: Cannot connect by ethernet

  1. #1
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    Cannot connect by ethernet

    Hi,

    OS: Lubuntu 12.04

    I am trying to connect to the internet via a wired connection on a computer which has not been connected to the Internet for some time (6 months?). I cannot browse the Internet and I am continually told that I am disconnected.

    Priorly though, I have connected using this computer by wired connection with the very same router and network parameters. I can connect via wired connection with the same router on another computer, and I can connect on this computer on a wireless connection to the same router.

    Anybody know what might be going on?

    Many thanks.

  2. #2
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    Re: Cannot connect by ethernet

    You could post the output of ifconfig, or whatever parameters you were talking about. Otherwise, how should anyone know?

  3. #3
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    Re: Cannot connect by ethernet

    Dear Mikewhatever, very often technically knowledgeable people underestimate the level of ignorance possible in technically unknowledgeable people.

    Here is the output of ifconfig:

    robert@robert-workdesk:~$ ifconfig
    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:1955 errors:0 dropped:0 overruns:0 frame:0
    TX packets:1955 errors:0 dropped:0 overruns:0 carrier:0
    collisions:0 txqueuelen:0
    RX bytes:167106 (167.1 KB) TX bytes:167106 (167.1 KB)


    wlan0 Link encap:Ethernet HWaddr 00:22:3f:ed:77:9e
    inet addr:192.168.1.64 Bcast:192.168.1.255 Mask:255.255.255.0
    inet6 addr: fe80::222:3fff:feed:779e/64 Scope:Link
    UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
    RX packets:1777630 errors:0 dropped:0 overruns:0 frame:0
    TX packets:1021329 errors:0 dropped:0 overruns:0 carrier:0
    collisions:0 txqueuelen:1000
    RX bytes:2561926063 (2.5 GB) TX bytes:191194838 (191.1 MB)

    Many thanks.
    Last edited by rdh61; September 21st, 2013 at 01:12 PM.

  4. #4
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    Re: Cannot connect by ethernet

    Yeah, sorry about that.
    So, the output doesn't show any ethernet interfaces (usually eth0). You'll need to digg a bit deaper, try "lspci" and "dmesg | grep eth" .

  5. #5
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    Re: Cannot connect by ethernet

    Your wireless lan seems to be connecting to your router OK so the problem may be between your router and the ISP.

    Can you provide the output from the following commands

    Code:
    lsb_release -a;ping-c5 8.8.8.8; route -n; nm-tool
    but It does not show any wired connection what's the output of

    Code:
    sudo lshw -C network
    Last edited by Warren Hill; September 21st, 2013 at 01:29 PM.

  6. #6
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    Re: Cannot connect by ethernet

    @ mikewhatever

    Code:
    robert@robert-workdesk:~$ lspci
    00:00.0 Host bridge: Intel Corporation 82845 845 [Brookdale] Chipset Host Bridge (rev 11)
    00:01.0 PCI bridge: Intel Corporation 82845 845 [Brookdale] Chipset AGP Bridge (rev 11)
    00:1d.0 USB controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #1 (rev 01)
    00:1d.1 USB controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #2 (rev 01)
    00:1d.2 USB controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #3 (rev 01)
    00:1d.7 USB controller: Intel Corporation 82801DB/DBM (ICH4/ICH4-M) USB2 EHCI Controller (rev 01)
    00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev 81)
    00:1f.0 ISA bridge: Intel Corporation 82801DB/DBL (ICH4/ICH4-L) LPC Interface Bridge (rev 01)
    00:1f.1 IDE interface: Intel Corporation 82801DB (ICH4) IDE Controller (rev 01)
    00:1f.3 SMBus: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) SMBus Controller (rev 01)
    00:1f.5 Multimedia audio controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) AC'97 Audio Controller (rev 01)
    01:00.0 VGA compatible controller: NVIDIA Corporation NV34 [GeForce FX 5200] (rev a1)
    03:02.0 Ethernet controller: D-Link System Inc RTL8139 Ethernet (rev 10)
    Code:
    robert@robert-workdesk:~$ dmesg | grep eth
    robert@robert-workdesk:~$

  7. #7
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    Re: Cannot connect by ethernet

    @ Warren Hill

    Code:
    robert@robert-workdesk:~$ lsb_release -a;ping-c5 8.8.8.8; route -n; nm-tool
    No LSB modules are available.
    Distributor ID:	Ubuntu
    Description:	Ubuntu 12.04.3 LTS
    Release:	12.04
    Codename:	precise
    ping-c5: command not found
    Kernel IP routing table
    Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
    0.0.0.0         192.168.1.1     0.0.0.0         UG    0      0        0 wlan0
    192.168.1.0     0.0.0.0         255.255.255.0   U     2      0        0 wlan0
    
    
    NetworkManager Tool
    
    
    State: connected (global)
    
    
    - Device: wlan0  [WLAN_7A3C] ---------------------------------------------------
      Type:              802.11 WiFi
      Driver:            rtl8187
      State:             connected
      Default:           yes
      HW Address:        00:22:3F:ED:77:9E
    
    
      Capabilities:
        Speed:           54 Mb/s
    
    
      Wireless Properties
        WEP Encryption:  yes
        WPA Encryption:  yes
        WPA2 Encryption: yes
    
    
      Wireless Access Points (* = current AP)
        *WLAN_7A3C:      Infra, 74:88:8B:C3:7A:3D, Freq 2412 MHz, Rate 54 Mb/s, Strength 85 WPA
    
    
      IPv4 Settings:
        Address:         192.168.1.64
        Prefix:          24 (255.255.255.0)
        Gateway:         192.168.1.1
    
    
        DNS:             192.168.1.1
    Code:
    robert@robert-workdesk:~$ sudo lshw -C network
    [sudo] password for robert: 
      *-network UNCLAIMED     
           description: Ethernet controller
           product: RTL8139 Ethernet
           vendor: D-Link System Inc
           physical id: 2
           bus info: pci@0000:03:02.0
           version: 10
           width: 32 bits
           clock: 33MHz
           capabilities: pm cap_list
           configuration: latency=32 maxlatency=64 mingnt=32
           resources: ioport:bc00(size=256) memory:5fefff00-5fefffff
      *-network
           description: Wireless interface
           physical id: 1
           bus info: usb@1:4
           logical name: wlan0
           serial: 00:22:3f:ed:77:9e
           capabilities: ethernet physical wireless
           configuration: broadcast=yes driver=rtl8187 driverversion=3.2.0-32-generic firmware=N/A ip=192.168.1.64 link=yes multicast=yes wireless=IEEE 802.11bg

  8. #8
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    Re: Cannot connect by ethernet

    OK, how about the output of "dmesg | grep 8139"? The correct module for that NIC seems to be 8139too, so try loading it with
    "sudo modprobe 8139too". Then check if it works, or if eth0 is in the output of ifconfig.

  9. #9
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    Re: Cannot connect by ethernet

    Code:
    robert@robert-workdesk:~$ dmesg | grep 8139
    [    1.775511] 8139too: 8139too Fast Ethernet driver 0.9.28
    [    1.775582] 8139too 0000:03:02.0: PCI INT A -> GSI 18 (level, low) -> IRQ 18
    [    1.775604] 8139too 0000:03:02.0: Chip not responding, ignoring board
    [    1.775619] 8139too 0000:03:02.0: PCI INT A disabled
    [    1.775631] 8139too: probe of 0000:03:02.0 failed with error -5
    Am I right in thinking that doesn't look too good?


    Code:
    robert@robert-workdesk:~$ sudo modprobe 8139too
    Still doesn't work.


    Code:
    [sudo] password for robert: 
    robert@robert-workdesk:~$ ifconfig
    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:529 errors:0 dropped:0 overruns:0 frame:0
              TX packets:529 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:0 
              RX bytes:49241 (49.2 KB)  TX bytes:49241 (49.2 KB)
    
    
    wlan0     Link encap:Ethernet  HWaddr 00:22:3f:ed:77:9e  
              inet addr:192.168.1.64  Bcast:192.168.1.255  Mask:255.255.255.0
              inet6 addr: fe80::222:3fff:feed:779e/64 Scope:Link
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:3419 errors:0 dropped:0 overruns:0 frame:0
              TX packets:3584 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:2226154 (2.2 MB)  TX bytes:673697 (673.6 KB)

  10. #10
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    Re: Cannot connect by ethernet

    Interesting output. I am no expert, but it might be broken. Let's wait and see what others think.
    Code:
    robert@robert-workdesk:~$ dmesg | grep 8139
    [    1.775511] 8139too: 8139too Fast Ethernet driver 0.9.28
    [    1.775582] 8139too 0000:03:02.0: PCI INT A -> GSI 18 (level, low) -> IRQ 18
    [    1.775604] 8139too 0000:03:02.0: Chip not responding, ignoring board
    [    1.775619] 8139too 0000:03:02.0: PCI INT A disabled
    [    1.775631] 8139too: probe of 0000:03:02.0 failed with error -5

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