networking hosed after upgrading to 10.04

[Md Ashickur Rahman Noor]

@scar

Please give the output of lspci and ifconfig of live cd.
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Thank you
Md Ashickur Rahman




On Tue, May 31, 2011 at 2:41 PM, Tom H <tomh0665 at gmail.com> wrote:

> On Mon, May 30, 2011 at 11:48 PM, scar <scar at drigon.com> wrote:
> >
> > i finally decided to upgrade an old machine from 9.10 to 10.04, and
> > there is something strange going on with the networking.
> >
> > this machine is only connected to my LAN using one ethernet port, and i
> > also had previously set up a bridge for use with a virtual machine i
> > have installed, so a rather simple setup but not standard.  i just used
> > the KVM setup guide on ubuntu.com somewhere to setup the bridge.
> >
> > when the system boots up, it can't be found on the LAN, and it can't
> > connect to websites either.
> >
> > in network manager i have several different connections that i don't
> > remember having:
> >
> > Wired connection 1
> > Auto eth0
> > Auto Ethernet
> > ifupdown (eth0)
> > ifupdown (br0)
> >
> > i'm pretty sure 'auto ethernet' was the only one i used before.  it
> > seems after i pick any one of these to connect to, i then have access to
> > my LAN, but still can't reach any outside websites for example.
> >
> > also, when i was running 9.10 my motherboard blew out and i had it
> > replaced under warranty.  however, a different model was sent since the
> > original had been discontinued.  i remember something strange happened
> > with the networking at that time too, but i was able to get it working
> > with some help from my loco team, and haven't had to fuss with it since.
> >
> > it seems to me this chain of events may have really messed up my
> > networking (this system has been upgraded since 8.10 too).  i'm
> > wondering if there is a simple way to wipe the slate clean and get my
> > LAN and bridge connections configured again...
>
> The "Auto" connections are created by NM and the "Ifupdown" are
> created by "/etc/network/interfaces" in conjunction with
> "managed=true" in "/etc/NetworkManager/nm-system-settings.conf" in the
> "ifupdown" section.
>
> I don't understand how you can have the "Auto" and "Ifupdown" entries
> simultaneously.
>
> What's the output of "nm-tool"?
>
> What's your bridge setup/configuration?
>
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