Since a week or 2, I have this random network failures. 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. And after many network-manager resets it will work again, for just a minute, and drop out again.

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

nameserver 127.0.0.1

I left out the "Do not edit" stuff, and after it worked for a second, this line is added:

search lan

When I change the nameserver to 8.8.8.8, I am still able 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 since lastnight(24-06-2013)