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I'm providing some of the terminal tests I done for a Dell latitude D520 with Ubuntu 12.04. Please any help will be appreciated.

PCI:

lspci

02:00.0 Ethernet controller: Broadcom Corporation BCM4401-B0 100Base-TX (rev 02) 
0c:00.0 Network controller: Broadcom Corporation BCM4311 802.11b/g WLAN (rev 01)

Network Devices:

ifconfig -a 
eth1      Link encap:Ethernet  HWaddr 00:19:b9:71:8b:fb  
          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: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:1165 errors:0 dropped:0 overruns:0 frame:0 
          TX packets:1165 errors:0 dropped:0 overruns:0 carrier:0 
          collisions:0 txqueuelen:0 
          RX bytes:120890 (120.8 KB)  TX bytes:120890 (120.8 KB) 

wlan0     Link encap:Ethernet  HWaddr 00:1b:fc:53:d9:c6  
          inet addr:192.168.1.105  Bcast:192.168.1.255  Mask:255.255.255.0 
          inet6 addr: fe80::21b:fcff:fe53:d9c6/64 Scope:Link 
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1 
          RX packets:23937 errors:0 dropped:0 overruns:0 frame:0 
          TX packets:20346 errors:0 dropped:0 overruns:0 carrier:0 
          collisions:0 txqueuelen:1000 
          RX bytes:20576514 (20.5 MB)  TX bytes:2424136 (2.4 MB)

Local Networks:

nm-tool 

NetworkManager Tool 

State: connected (global) 

- Device: eth1 ----------------------------------------------------------------- 
  Type:              Wired 
  Driver:            b44 
  State:             unavailable 
  Default:           no 
  HW Address:        00:19:B9:71:8B:FB 

  Capabilities: 
    Carrier Detect:  yes 

  Wired Properties 
    Carrier:         off 


- Device: wlan0  [kouts103] ---------------------------------------------------- 
  Type:              802.11 WiFi 
  Driver:            b43 
  State:             connected 
  Default:           yes 
  HW Address:        00:1B:FC:53:D9:C6 

  Capabilities: 
    Speed:           54 Mb/s 

  Wireless Properties 
    WEP Encryption:  yes 
    WPA Encryption:  yes 
    WPA2 Encryption: yes
mchid
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GEORGE
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2 Answers2

1

Edit:

Okay, from what you have listed, the problem appears to be your file /etc/NetworkManager/NetworkManager.conf. Open a terminal and execute the following commands:

sudo nano /etc/NetworkManager/NetworkManager.conf

Make sure the file says the following, nothing more and nothing less:

[main]
plugins=ifupdown,keyfile

[ifupdown]
managed=false

Then, press CTRL + o to save the file and press CTRL + x to exit the file.

Also, edit /etc/network/interfaces:

sudo nano /etc/network/interfaces

and make sure that file has only these contents:

auto lo
iface lo inet loopback

Again, press CTRL + o to save the file and press CTRL + x to exit the file.

Finally, execute the following commands and then connect the ethernet cable and it should automatically detect and switch to the wired connection:

sudo service network-manager restart

To explain: You do not want the network as "managed" because you want to use "auto" instead. Also, you had the default device set to wireless for some reason. Both of those together along with the "no-auto-..." flag basically disabled your auto ethernet.

Normally, however, when the system has a wired and a wireless connection, the wired connection will always be favored and used even when they are both connected because eth0 should be the default device by default.

First:

Unplug in your ethernet cable and run the following commands from an open terminal:

sudo mkdir /etc/NetworkManager/connections-backup
sudo mv /etc/NetworkManager/system-connections/* /etc/NetworkManager/connections-backup

sudo service network-manager restart

Plug the ethernet cable in. Click on the network-manager icon on your desktop panel to open the dropdown menu. Then, click on "Auto eth0"

enter image description here

If you see some message similar to "device is not managed" or "device is managed" please let me know and I'll post instructions on how to get around that.

If the network doesn't come up like it's supposed to after plugging in the ethernet cable, run the following command to refresh network-manager:

sudo service network-manager restart

Or, run these commands to unload and reload the driver:

sudo modprobe -r b44
sudo modprobe b44

If it says that b44 is in use, run 

lsmod | grep b44

and it should show what module is using b44. Use 

sudo modprobe -r

followed by the module name you wish to disable before pressing enter.

Then, use 

sudo modprobe b44

to load the driver again.

Make sure your firewall is not blocking ports 67, 68, or 53 (dhcp, dhcp, and dns respectively). If you have not done anything to explicitly block these ports they are most likely not blocked as you would've had to have set a rule yourself to block them.

mchid
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0

Finally suspected the Ethernet port not working,and at, system setting / network showed wired unplugged. I ordered from ebay "USB to Ethernet connector" and soonest i connected, Ethernet became live.

GEORGE
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