After upgrading two instances of an older Ubuntu (10.10 and 11.04) to 12.04, I notice an apparent conflict between the way my network interfaces were previously managed and the new methodology, which apprently is extremely "Network-Manager-Centric."
It seems that my previous configurations, stored in /etc/network/interfaces, continue to work, but tools like 'dhclient' not longer function as expected. Now, in order to re-configure the interface between a static IP and a DHCP IP, I've discovered the best solution is to comment out all but the 'lo' adapter in the /etc/network/interfaces file, and just perform all my configuraion changes with Network Manager.
My question is 2-fold:
- Is this expected behavior, as part of some kind of long-term plan to exclusively use Network Manager?
- Is there documentation which describes the current state of network interface management in Ubuntu?