How do I get the default Network Manager plus dnsmasq-base setup back again?

[Tom H]

On Sun, Jan 13, 2013 at 9:54 AM, Chris Green <cl at isbd.net> wrote:
> On Sat, Jan 12, 2013 at 05:55:41PM -0500, Tom H wrote:
>> On Thu, Jan 10, 2013 at 8:33 AM, Chris Green <cl at isbd.net> wrote:
>>> On Wed, Jan 09, 2013 at 05:31:59PM -0500, Tom H wrote:
>>>> On Wed, Jan 9, 2013 at 9:54 AM, Chris Green <cl at isbd.net> wrote:
>>>>>
>>>>> All I get to see in /var/log/syslog (about dnsmasq) is:-
>>>>>
>>>>>     Jan  9 14:51:03 test NetworkManager[872]: <info> DNS: loaded plugin dnsmasq
>>>>>
>>>>> Network Manager continues to report all sorts of other things happening but not a thing
>>>>> about dnsmasq. It's like dnsmasq simply hangs when it's loaded.
>
> I finally found out what the problem was.  You have to remove *everything*
> from /etc/network/interfaces except the loopback interface, otherwise
> Network Manager assumes a manual configuration and does nothing.
>
> So now my /etc/network/interfaces is:-
>
>     # this file describes the network interfaces available on your system
>     # and how to activate them. For more information, see interfaces(5).
>
>     # The loopback network interface
>     auto lo
>     iface lo inet loopback
>
> ... and everything is working as it should!  :-)

I'm glad that it's working.

I just assumed (!) that only "lo" was set up in "/e/n/i". I even said
that I commented out "eth0" in one of my posts [1] when I was trying
to reproduce your problem.

1. https://lists.ubuntu.com/archives/ubuntu-users/2013-January/266643.html