Total Networking Failure after upgrade to 12.04LTS

compdoc compdoc at
Sun Jul 28 02:32:48 UTC 2013

> After a server upgrade from 10.04LTS to 12.04LTS, which otherwise seemed
very normal, networking is non-functional. Nothing works (ping, dns, ssh,
etc). Cannot ping any address, even on the LAN, and the system is not
pingable from other systems on the LAN.



There is a file that has given me endless problems when I change network
adaptors in my servers. The code that creates it and modifies it is not very
robust, and sometimes you have to take matters into your own hands:




You might look at this file. Supposedly, if you delete the file, or delete
the entries for your nics within the file, it should generate a new file or
new entries. But this doesn't always happen, so don't make changes without a


If you have two nics there should be two entries in that file. Often, it
gets confused and you'll have more entries than you should. However, I don't
know how many entries you should see for bonded nics since I haven't used a
bonded pair in years. 


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <>

More information about the ubuntu-users mailing list