[PLUG] Network failure

[drew wymore]

On Sat, Nov 14, 2009 at 11:13 AM, Denis Heidtmann <denis.heidtmann at gmail.com
> wrote:

> Trying to understand what happened to my network on Sep 21, 2009, and
> actions to take if it happens again.
>
> Background: Running Ubuntu 9.04 with NetworkManager
> (http://projects.gnome.org/NetworkManager/)
> DSL modem.  No wireless.
>
> On 9/21/09 all network communication failed.  I power cycled the modem
> to no effect.  My son changed /etc/network/interfaces from:
> auto lo
>
> iface lo inet loopback
>
>
> to:
> auto lo
>
> iface lo inet loopback
>
>
>
> auto eth0
>
> iface eth0 inet dhcp
>
>
> After restarting the network was restored, but the NetworkManager
> applet which displays the network status on the task bar shows the
> network as not functional.
>
> Since this occurrence I have had two more times that the network
> failed.  In both cases after shutting down for an hour or so then
> restarting the network came back up functional.  During one of these
> most recent failures, I looked at a GUI which displays, among other
> things, Netstat outputs.
>
>  When it had failed:
>
>
>
>  Destination Gateway        Netmask      Interface
>
>  169.254.0.0 0.0.0.0           255.255.0.0 eth0
>
>  0.0.0.0             0.0.0.0        0.0.0.0         eth0
>
>  fe80::                  ::                64        eth0
>
>  ...snip...
>
> When it was functional:
>
>
>
>  Destination Gateway  Netmask         Interface
>
>  192.168.0.0 0.0.0.0          255.255.255.0   eth0
>
>  169.254.0.0 0.0.0.0          255.255.0.0     eth0
>
>  0.0.0.0           192.168.0.1   0.0.0.0         eth0
>
>  fe80::                   ::                64            eth0
>
>  ...snip...
>
>
> The spontaneous fixes since the first occurrence leads me to consider
> the possibility that Evan's edit of /etc/network/interfaces did not
> fix the issue, but only served to break the NetworkManager applet.
>
> I am interested in having a bag of diagnostic tricks at the ready when
> it happens again.  High on my list of suspects is the DSL modem.  I am
> also interested in restoring the NetworkManager applet to function.
>
> Suggestions?
>
> -Denis
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Denis,
What kind of DSL modem is it, who's your ISP?