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Accepted
mahdiar
Asked: 2011-10-16 11:49:52 +0800 CST

Unable to connect to wired DHCP connection via my PC?

  • 772

Hi As I upgrade my pc to ubuntu 11.10 I can't connect to the wired connection ! It doesn't even find my Device MAC address !!What can I do ?

ifconfig -a

eth0      Link encap:Ethernet  HWaddr ff:ff:ff:ff:ff:ff  
          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:44 Base address:0x2000 

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:6647 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6647 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:1333687 (1.3 MB)  TX bytes:1333687 (1.3 MB)

the answer of etc/network/interfaces

auto lo
iface lo inet loopback


sudo lshw -class network

 *-network       
       description: Ethernet interface
       product: RTL8111/8168B PCI Express Gigabit Ethernet controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:04:00.0
       logical name: eth0
       version: 02
       serial: ff:ff:ff:ff:ff:ff
       size: 1Gbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix vpd bus_master cap_list rom ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full firmware=N/A latency=0 link=no multicast=yes port=MII speed=1Gbit/s
       resources: irq:44 ioport:c000(size=256) memory:cff20000-cff20fff memory:cff00000-cff0ffff memory:cff10000-cff1ffff


 lspci

00:00.0 Host bridge: Intel Corporation 4 Series Chipset DRAM Controller (rev 03)
00:01.0 PCI bridge: Intel Corporation 4 Series Chipset PCI Express Root Port (rev 03)
00:1a.0 USB Controller: Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #4
00:1a.1 USB Controller: Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #5
00:1a.2 USB Controller: Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #6
00:1a.7 USB Controller: Intel Corporation 82801JI (ICH10 Family) USB2 EHCI Controller #2
00:1b.0 Audio device: Intel Corporation 82801JI (ICH10 Family) HD Audio Controller
00:1c.0 PCI bridge: Intel Corporation 82801JI (ICH10 Family) PCI Express Root Port 1
00:1c.4 PCI bridge: Intel Corporation 82801JI (ICH10 Family) PCI Express Root Port 5
00:1c.5 PCI bridge: Intel Corporation 82801JI (ICH10 Family) PCI Express Root Port 6
00:1d.0 USB Controller: Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #1
00:1d.1 USB Controller: Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #2
00:1d.2 USB Controller: Intel Corporation 82801JI (ICH10 Family) USB UHCI Controller #3
00:1d.7 USB Controller: Intel Corporation 82801JI (ICH10 Family) USB2 EHCI Controller #1
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev 90)
00:1f.0 ISA bridge: Intel Corporation 82801JIB (ICH10) LPC Interface Controller
00:1f.2 IDE interface: Intel Corporation 82801JI (ICH10 Family) 4 port SATA IDE Controller #1
00:1f.3 SMBus: Intel Corporation 82801JI (ICH10 Family) SMBus Controller
00:1f.5 IDE interface: Intel Corporation 82801JI (ICH10 Family) 2 port SATA IDE Controller #2
01:00.0 VGA compatible controller: nVidia Corporation G92 [GeForce 9600 GSO] (rev a2)
03:00.0 IDE interface: JMicron Technology Corp. JMB368 IDE controller
04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 02)
05:00.0 Memory controller: Conexant Systems, Inc. Device 2d00 (rev 01)


uname -a
Linux mahdiar-EP45-UD3L 3.0.0-15-generic #26-Ubuntu SMP Fri Jan 20 17:23:00 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
connection

2 Answers

  1. Best Answer

    The kernel incorrectly matches this NIC with the r8169 kernel module. This is shown by the lshw trace where it shows that the NIC has been disabled.

    According to this article, the NIC should be associated with the r8168 kernel module. With the incorrect kernel module you will either get slow speeds or no connection what-so-ever.

    According to Launchpad - this is also a recognised bug with Oneiric - however, it looks like it has been resolved for 12.04 since Precise uses a newer kernel (v3.2)

    hardware issues

    First, let's rule out a NIC hardware failure - NICs can go bad (the firmware/ROM) - an indication of this is the fact that the MAC address is recognised as FF:FF:FF:FF:FF

    If you last had a working NIC with Natty (or previous Ubuntu version) - then boot your PC with a LiveUSB/LiveCD.

    Test your wired connection - rerun sudo lshw -class network. Look for the MAC address. Also look to see if it still says disabled.

    If it still fails to connect via a live usb/cd with the version of ubuntu it last worked with then you have a strong indication of hardware failure.

    potential software solutions

    Once you have ruled out hardware issues, then lets concentrate on possible software solutions.

    For the solutions below you will still need a valid internet connection...

    If you have a spare NIC card that is not of this model I would insert this into your PC and connect to the internet via a wired connection. If you can connect via wireless - do so. Otherwise, you may need to move your hard-drive into another computer to do the following and then transfer it back to your original PC.

    FIRST - BACKUP YOUR SYSTEM with a good backup tool such as Clonezilla

    Suggested Fix 1

    According to the launchpad bug report, this is potentially fixed if you enable the proposed repository in software sources and install the package linux-backports-modules-3.0.0

    Suggested Fix 2

    You may be able to download the Precise kernel (v3.2) and install this.

    From the mainline kernel area of launchpad:

    Download the amd64 headers.deb, headers_all.deb and the image_amd64.deb files

    then install the kernel using the syntax:

    sudo dpkg -i [package_name].deb

    Suggested Fix 3

    This is something you may be able to resolve by downloading the realtek driver and compiling it yourself.

    Download the Linux source - at the time of writing this it is v8.028.00

    Unpack the tarball :

    tar vjxf r8168*.tar.bz2

    Change to the directory:

    cd r8168-8*

    Compile:

    sudo ./autorun.sh

    You can check whether the driver is loaded by using following commands.

    lsmod | grep r8168
ifconfig -a

    If there is a device name, ethX, shown on the monitor, the linux driver is loaded. Then, you can use the following command to activate the ethX.

    ifconfig ethX up

    Finally, blacklist the r8169 driver add the following to /etc/modprobe.d/blacklist.conf

    #blacklist r8169 driver
blacklist r8169

    Potential workarounds

    A similar bug-report mentioning odd-MAC addresses for the r8169 kernel module on older kernels gave a couple of suggested workarounds.

    work around 1

    Once booted stop and start the kernel module:

    sudo rmmod r8169 && sudo modprobe r8169

    work around 2

    Boot from your Natty live CD - run ifconfig -a and record the MAC address for eth0.

    Boot into oneiric. Examine your udev persistent rules and map the correct MAC address to eth0

    sudo cp /etc/udev/rules.d/70-persistent-net.rules /
sudo nano /etc/udev/rules.d/70-persistent-net.rules

    change the MAC address. If in doubt - please add to your question the contents of your rules file.

    • 6 
  2. HWaddr ff:ff:ff:ff:ff:ff

    Really? Is this your real MAC Address or you are spoofing ?? Change your MAC Address from Broadcast address to something else(Spoof another address):

    sudo ifconfig eth0 hw ether xx:xx:xx:xx:xx:xx
sudo service networking restart

    Place the new MAC Address instead of xx:xx:xx:xx:xx:xx

    • -3