networking hosed after upgrading to 10.04

[Tom H]

On Tue, May 31, 2011 at 1:05 PM, compdoc <compdoc at hotrodpc.com> wrote:
>>
>>now that i've deleted those connections, the
>>two that remain are:
>>
>>ifupdown (eth0), and
>>ifupdown (br0)
>
> I don't use ifupdown (eth0) or ifupdown (br0) and have no entries in NM, not
> even those.

The reason for the "ifupdown" entries is that in order to have
settings in "/e/n/i" take effect when using NM, you have to allow the
use of ifupdown in "/etc/NetworkManager/nm-settings". NM then presents
you with the NICs set up in /e/n/i and prepends them with "ifupdown".