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Thread: Cannot Connect Ethernet, But Can Connect Wireless

  1. #1
    Join Date
    Aug 2009
    Beans
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    Cannot Connect Ethernet, But Can Connect Wireless

    Ubuntu Version: Intrepid Ibex

    I used to be able to connect via ethernet to my router, but currently I cannot. Wireless connects fine, and I am able to browse internet, but as far as ethernet, I cannot connect. I am trying to transfer a large number of files from one computer to another, so using the ethernet is more preferable.

    I am not sure which settings I should post, so please let me know

  2. #2
    Join Date
    Jul 2009
    Location
    in front of the computer
    Beans
    139
    Distro
    Ubuntu 9.10 Karmic Koala

    Re: Cannot Connect Ethernet, But Can Connect Wireless

    Try checking the settings in networkmanager, at notification area.
    linux user: #498107

  3. #3
    Join Date
    Aug 2008
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    44
    Distro
    Ubuntu 9.04 Jaunty Jackalope

    Re: Cannot Connect Ethernet, But Can Connect Wireless

    Did you stop/shutdown the wireless link when you make the wired connection?
    Do you have a firewall running e.g. Firestarter. You will need to set the interface in it if you switch.

  4. #4
    Join Date
    Jul 2008
    Beans
    8

    Re: Cannot Connect Ethernet, But Can Connect Wireless

    I'm having a similar problem on my new Asus Aspire Timeline. When I go into network tools and devices, eth0 doesn't show. Any help is much appreciated. Thanks in advance, Gavin.

    Here is lspci hopefully it's helpful
    Code:
    00:00.0 Host bridge: Intel Corporation Mobile 4 Series Chipset Memory Controller Hub (rev 07)
    00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)
    00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)
    00:1a.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #4 (rev 03)
    00:1a.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #5 (rev 03)
    00:1a.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #2 (rev 03)
    00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 03)
    00:1c.0 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 1 (rev 03)
    00:1c.1 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 2 (rev 03)
    00:1d.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #1 (rev 03)
    00:1d.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2 (rev 03)
    00:1d.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #3 (rev 03)
    00:1d.3 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #6 (rev 03)
    00:1d.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1 (rev 03)
    00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev 93)
    00:1f.0 ISA bridge: Intel Corporation ICH9M-E LPC Interface Controller (rev 03)
    00:1f.2 SATA controller: Intel Corporation ICH9M/M-E SATA AHCI Controller (rev 03)
    00:1f.3 SMBus: Intel Corporation 82801I (ICH9 Family) SMBus Controller (rev 03)
    00:1f.6 Signal processing controller: Intel Corporation 82801I (ICH9 Family) Thermal Subsystem (rev 03)
    01:00.0 Ethernet controller: Attansic Technology Corp. Device 1063 (rev c0)
    02:00.0 Network controller: Atheros Communications Inc. AR928X Wireless Network Adapter (PCI-Express) (rev 01)

  5. #5
    Join Date
    Aug 2009
    Beans
    7

    Re: Cannot Connect Ethernet, But Can Connect Wireless

    Here is what I have for settings in Network Configuration:

    Now I do have two ethernet connections showing (which I find weird). I have tried removing one and working with the other, but the one I remove comes back.

    For auto eth0:
    Connect Automatically - Checked
    System Setting - Unchecked
    Wired
    Mac Address: <Blank>
    MTU: Automatic
    802.1x Security
    Use 802.1x Security for this Connection: Unchecked
    IPV4 Settings
    Method: Automatic (DHCP)
    DHCP Client ID: <Blank>
    Routes - Nothing listed

    There is no proxy enabled either.

  6. #6
    Join Date
    Aug 2009
    Beans
    7

    Re: Cannot Connect Ethernet, But Can Connect Wireless

    Sorry, forgot Auto eth0 (second connection)

    Auto eth0

    Connect Automatically - Checked
    System Setting - Checked
    Wired
    Mac Address: set
    MTU: Automatic
    802.1x Security
    Use 802.1x Security for this Connection: Unchecked
    IPV4 Settings
    Method: Automatic (DHCP)
    DHCP Client ID: <Blank>
    Routes - Nothing listed

  7. #7
    Join Date
    Aug 2008
    Beans
    44
    Distro
    Ubuntu 9.04 Jaunty Jackalope

    Re: Cannot Connect Ethernet, But Can Connect Wireless

    Can you post these
    ifconfig -a wired and wireless
    more /etc/network/interfaces only once
    more /etc/NetworkManager/nm-system-settings.conf only once
    ls /etc/NetworkManager/system-connections wired and wireless
    Last edited by dbalascak; August 29th, 2009 at 06:51 PM.

  8. #8
    Join Date
    Aug 2009
    Beans
    7

    Re: Cannot Connect Ethernet, But Can Connect Wireless

    Quote Originally Posted by dbalascak View Post
    Can you post these
    ifconfig -a wired and wireless
    more /etc/network/interfaces only once
    more /etc/NetworkManager/nm-system-settings.conf only once
    ls /etc/NetworkManager/system-connections wired and wireless
    ifconfig -a
    Code:
    eth0      Link encap:Ethernet  HWaddr 00:18:8b:b9:1f:93  
              UP BROADCAST RUNNING MULTICAST  MTU:64  Metric:1
              RX packets:7067 errors:39 dropped:1 overruns:0 frame:35
              TX packets:13 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:2115733 (2.1 MB)  TX bytes:1845 (1.8 KB)
              Interrupt:17 
    
    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:65 errors:0 dropped:0 overruns:0 frame:0
              TX packets:65 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:0 
              RX bytes:13760 (13.7 KB)  TX bytes:13760 (13.7 KB)
    
    pan0      Link encap:Ethernet  HWaddr c6:6c:6f:bb:cc:95  
              inet6 addr: fe80::c46c:6fff:febb:cc95/64 Scope:Link
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:0 errors:0 dropped:0 overruns:0 frame:0
              TX packets:443 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:0 
              RX bytes:0 (0.0 B)  TX bytes:95047 (95.0 KB)
    
    pan0:avahi Link encap:Ethernet  HWaddr c6:6c:6f:bb:cc:95  
              inet addr:169.254.9.149  Bcast:169.254.255.255  Mask:255.255.0.0
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
    
    wlan0     Link encap:Ethernet  HWaddr 00:13:e8:09:3b:1d  
              inet addr:192.69.69.57  Bcast:192.69.69.255  Mask:255.255.255.0
              inet6 addr: fe80::213:e8ff:fe09:3b1d/64 Scope:Link
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:64368 errors:0 dropped:0 overruns:0 frame:0
              TX packets:45386 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:74609783 (74.6 MB)  TX bytes:6476039 (6.4 MB)
    
    wmaster0  Link encap:UNSPEC  HWaddr 00-13-E8-09-3B-1D-62-31-00-00-00-00-00-00-00-00  
              UP BROADCAST RUNNING 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)
    more /etc/network/interfaces
    Code:
    auto lo
    iface lo inet loopback
    more /etc/NetworkManager/nm-system-settings.conf
    Code:
    [main]
    plugins=ifupdown,keyfile
    
    [ifupdown]
    managed=false
    ls /etc/NetworkManager/system-connections
    Code:
    <nothing returned>

  9. #9
    Join Date
    Jul 2008
    Beans
    8

    Re: Cannot Connect Ethernet, But Can Connect Wireless

    here are my results, each is labeled in the quote by

    Quote Originally Posted by ifconfig -a

    Only wireless showed, how do i do it for wired?

    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:36 errors:0 dropped:0 overruns:0 frame:0
    TX packets:36 errors:0 dropped:0 overruns:0 carrier:0
    collisions:0 txqueuelen:0
    RX bytes:2480 (2.4 KB) TX bytes:2480 (2.4 KB)

    pan0 Link encap:Ethernet HWaddr 0e:0d:34:3b:13:83
    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:0
    RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

    wlan0 Link encap:Ethernet HWaddr 00:17:c4:87:3e:1d
    inet addr:192.168.0.199 Bcast:192.168.0.255 Mask:255.255.255.0
    inet6 addr: fe80::217:c4ff:fe87:3e1d/64 Scope:Link
    UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
    RX packets:25932 errors:0 dropped:0 overruns:0 frame:0
    TX packets:20096 errors:0 dropped:0 overruns:0 carrier:0
    collisions:0 txqueuelen:1000
    RX bytes:28305620 (28.3 MB) TX bytes:4023156 (4.0 MB)

    wmaster0 Link encap:UNSPEC HWaddr 00-17-C4-87-3E-1D-65-31-00-00-00-00-00-00-00-00
    UP BROADCAST RUNNING 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)
    Quote Originally Posted by more /etc/network/interfaces
    auto lo
    iface lo inet loopback
    Quote Originally Posted by more /etc/NetworkManager/nm-system-settings.conf
    [main]
    plugins=ifupdown,keyfile

    [ifupdown]
    managed=false
    Quote Originally Posted by ls /etc/NetworkManager/system-connections
    Doesn't do anything
    Last edited by g2k556; August 29th, 2009 at 07:24 PM.

  10. #10
    Join Date
    Aug 2008
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    44
    Distro
    Ubuntu 9.04 Jaunty Jackalope

    Re: Cannot Connect Ethernet, But Can Connect Wireless

    ok. So both of you are NOT using NetworkManager to configure the interfaces as the file /etc/NetworkManager/nm-settings.conf shows Managed=false. NetworkManager will not look for any interfaces.

    Kaufmed
    Your interface eth0 has an MTU size of 64. This is not correct. Should 1500. This the maximum size of ethernet packet that the interface will send. See if you can set it with
    Code:
    sudo ifconfig eth0 mtu 1500
    If this seems to be acceptted do an ifconfig -a to confirm it. Plug in the ethernet cable and do teh same ifconfig -a command. You should see an IP address assigned to the interface eth0. If this is true, you will need to set up NetworkManager so that you can switch between the two interfaces.


    g2k556
    Your network card is not being seen by the system. Kaufmed, did you load drivers or anything to have your system recognize you LAN cand?

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