I have installed 13.04 (64bit) and after not having any wired internet, did a fresh install with 12.04 (64bit). The machine was previously running Windows 7 with wired connection working fine. A wierd issue is that normal Google searches (even images!) work from Firefox. Clicking on any links fails, however.

I cannot paste terminal outputs as I only have wired access from the Ubuntu machine.

uname -r shows that the kernel is: 3.8.0-29-generic.

ifconfig shows that eth0 has an inet address (

Pinging google.com or gives the following result:

PING www.google.com ( 56(84) bytes of data

4 packets transmitted, 0 received, 100% packet loss, time 3023ms

Pinging the router is successful:

4 packets transmitted, 4 received, 0% packet loss, time 3000ms

dmesg gives the following output for eth0:

tg3 0000:02:00.0 eth0: Link is up at 100 Mbps, full duplex

tg3 0000:02:00.0 eth0: Flow control is off for TX and off for RX

Let me know if I need to provide more information.


Update 1:

Output for sudo lshw -class network:


Description: Ethernet interface

product: Netlink BCM5784M Gigabit Ethernet PCIe

vendor: Broadcom Corp

physical id: 0

bus info pci@0000:02:00.0

local name: eth0

version: 10

serial 00:23:ae:65:31:ce

size: 100mbit/s

capacity: 1Gbit/s

width: 64bits

clock: 33MHz

Output for route -n

Kernel IP routing table

Destination, Gateway, Genmask, Flags, Metric, Ref, Iface,,, UG, 100, 0, eth0,,, U, 0, 0, eth0,,, U, 1000, 0, eth0

Update 2:

Changing the mtu to 1472 and restarting the network did not have any effect

Here is the output for cat /etc/network/interfaces:

auto lo

iface lo inet loopback

Update 3:

Ok so apparently I need to go through a proxy server. I have followed instructions given here:

How to Configure Ubuntu desktop to use your proxy server

This has been successful in enabling fullinternet access. I have set proxies following a few instructions here.

Thank you for the help!

  • Can you please provide these output? sudo lshw -class network and route -n – PeppeDAlterio Sep 12 '13 at 14:41
  • Hi Peppe, I updated my question. Sorry for the messy outputs. – SO_tourist Sep 12 '13 at 14:55
  • Try reducing the MTU sudo ifconfig eth0 mtu 1472 and then restart the network sudo /etc/init.d/networking restart. If this doesn't help, provide us this file: cat /etc/network/interfaces – PeppeDAlterio Sep 12 '13 at 17:49
  • Posted reply under Update 2 – SO_tourist Sep 13 '13 at 7:52

I had the same issue after a fresh install of Ubuntu 12.04 LTS. All I did was go here: http://howtoubuntu.org/things-to-do-after-installing-ubuntu-12-04-precise-pangolin#.UjHYe9K-qHM and follow the instructions that they provide to download and run the script or you can execute every command that they provide but I think it's just easier to download the script and run it. I'm completely new at this but my issue was resolved after doing this. I hope this helps.

  • Hi Jake, Thanks for the reply. The problem is the script downloads stuff from the internet via wget and then proceeds to download stuff from the repository via apt-get. – SO_tourist Sep 13 '13 at 7:48

Try adding these lines into /etc/network/interfaces

auto eth0
iface eth0 inet dhcp

To open the file and add the lines, you can do: sudo gedit /etc/network/interfaces

And restart your network: sudo /etc/init.d/networking restart

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