Re: network status change issue...

On Tue, 2009-05-05 at 15:41 -0500, Hooker, Jonathan wrote:
> Hey,
> I am currently having issues with Network Manager. Whenever I unplug
> the ethernet cable Network Manager picks up on the fact it is
> disconnected. Then it tries to connect to whatever wifi connections I
> have setup. This works properly. The issue I am running into is
> whenever I plug back in the active network cable Network Manager
> continues to see the ethernet card as disconnected. I have to either
> restart Network Manager or at least uncheck Enable Networking and
> recheck it in the Network Manager menu. Only after I do that does

This says that the carrier detection logic with netlink may not be
working properly.  Can you check /sys/class/net/<interface>/carrier
after you plug it back in, and what that says?  If it's '1', then
proceed to the next step here.  If it's '0', then it's a driver problem
in the kernel.

If carrier is '1', then it could be a problem with netlink carrier
events being delivered to NM.  You'll want to poke around in the NM
source in src/nm-netlink-monitor.c, in the
netlink_object_message_handler() function, and put some debugging prints
in there to see what's going on.  We're especially interested in the
'flags' variable is at this point, and whether it's IFF_UP or
IFF_LOWER_UP or what.


>  Network Manager reconnect to the active ethernet connection… I have
> tried googleing for info on this issue but have come up with nada… Any
> help you could provide would be great. Also, I have setup Network
> Manager on this machine to use a globally configured network config
> file stored in /etc/NetworkManager/system-connections. The config file
> is setup properly and it does work just fine. It just seems that NM
> stops polling for a change in the eth0 device once I unplug it.
> Jonathan Hooker
> Desktop Support – Engineering (Linux)
> Garmin International
> Jonathan Hooker Garmin com
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