[PLUG] Network failure
linux-yug
linux-yug at xprt.net
Sat Nov 14 20:30:38 UTC 2009
On Sat, 2009-11-14 at 11:13 -0800, Denis Heidtmann 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
169.254.xx.xx is NOt a good IP address..
HTH
Linux-yug
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