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Accepted
Dr_Bunsen
Asked: 2013-06-26 07:46:55 +0800 CST

Internet connection drops out

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I have this random network failure. No error pops up, the system says it's still connected to the internet(wifi and wired).
The problem is, I can't connect to anything, even a ping google.com gives no feedback.
This only affects eth0, wifi is still working correctly, the cable and the port are fine.
I know this because when I boot my device, it is connected to the internet, skype logs in, but when I want to open a connection to anything else(browser, vm, ping or whatever) it drops out, saying it is still connected and no errors.

I noticed that the /etc/resolv.conf contains this line:

nameserver 127.0.0.1

I had a random 3 sec connection, after which it dropped out again, and this line was added in the resolv.conf

search lan

When I change the nameserver to 8.8.8.8, I am still unable to connect to anywhere.

Does anyone got a clue what is happening here? I will provide any information asked.

Thanks in advance

p.s. I run Ubuntu 13.04, and started after upgrading from 12.10 to 13.04

wireless

1 Answers

  1. Best Answer

    One known bug that could be affecting you is this: https://bugs.launchpad.net/ubuntu/+source/dnsmasq/+bug/1003842

    Try disabling the local forwarding nameserver. In NetworkManager.conf

    gksudo gedit /etc/NetworkManager/NetworkManager.conf

    or

    sudo gedit /etc/NetworkManager/NetworkManager.conf

    comment out the line dns=dnsmasq

    #dns=dnsmasq

    and save the file and restart NetworkManager.

    sudo restart network-manager
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