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 _______________________________________________ PLUG mailing list [email protected] http://lists.pdxlinux.org/mailman/listinfo/plug
