On Thu, 2009-05-07 at 08:01 -0700, Marcel Holtmann wrote: > Hi Dan, > > > > 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. > > actually just calling "ip link" after plugging in that cable would be > enough. It shows the proper flags. > > Jonathan, you might be running an old version of NM that uses IFF_UP for > carrier detection and that is wrong (not an obvious bug, but neverless a > bug). For detecting carrier changes via interface flags, IFF_LOWER_UP > should be used.
It was correct up to 2.6.17, and still works for some drivers that didn't quite get converted over... But yes, IFF_LOWER_UP is the real correct flag, and if something doesn't work with IFF_LOWER_UP then that driver needs to be fixed. dan _______________________________________________ NetworkManager-list mailing list [email protected] http://mail.gnome.org/mailman/listinfo/networkmanager-list
