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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 or gives the following result:

PING ( 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!

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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. – user989199 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 – user989199 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: 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.

share|improve this answer
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. – user989199 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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