RE: network status change issue...

["Hooker, Jonathan" <Jonathan Hooker garmin com>]

Ok. I guess I am confused. On Fedora 10 it shows that my version is 0.7.0.99. Are you referring to the version of the individual file in the source when you say 2.6.17?

Jonathan Hooker
Desktop Support - Engineering
Garmin International
Jonathan Hooker Garmin com
-----Original Message-----
From: Dan Williams [mailto:dcbw redhat com]
Sent: Thursday, May 07, 2009 10:11 AM
To: Marcel Holtmann
Cc: Hooker, Jonathan; networkmanager-list gnome org
Subject: Re: network status change issue...

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



This e-mail and any attachments may contain confidential material for the sole use of the intended recipient. If you are not the intended recipient, please be aware that any disclosure, copying, distribution or use of this e-mail or any attachment is prohibited. If you have received this e-mail in error, please contact the sender and delete all copies.

Thank you for your cooperation