[olug] Ubuntu losing network

[Larry Walls]

First, thanks to everyone for their suggestions to my problem.  Here is an
update:

Moved to another port on the switch, same issue.
Changed the patch cable, same issue.  Although I did realize I was connected
via Cat5 at GB speed so I swapped the patch cable for Cat 6.  Still same
issue.
Booted from LiveCD and have not had the issue again.  I will let it run
overnight just to make sure but so far so good (or bad as the case may be).

Here is another tidbit of info.  Looking back at some ifconfig results I
found this:

When the box is connected and working, ifconfig reports eth0 and lo with a
correctly assigned IP address to eth0.  When the box is not working,
ifconfig reports no IP address assigned to eth0, continues to report lo, but
now also reports eth0:avahi with an IP address of 169.254.7.151.  I dont
know where or what this is coming from and obviously that IP address is no
good on my network.

The saga continues.

On Tue, Nov 25, 2008 at 3:32 PM, DYNATRON tech <dynatron at gmail.com> wrote:

> i had similar problems with a "green" GB swtich. it used some proprietary
> method to save on energy consumption.
> i had to swap it with a switch where the cable runs were shorter.
> for some reason it was the long cable runs on the "green" switch that
> caused
> it to drop connections sporadically.
>
> however, ubuntu may be the problem in this case...
>
> i am also using ubuntu on my laptop, and have struggled with a similar
> situation (it gets worse over time). it's gotten so bad i can't use the
> eth0
> for more than 5 minutes without it bouncing up and down. if i leave it
> there
> bouncing, my screen slowly goes crazy and/or i get a kernel panic. every
> once in a while the interface goes up without a cable inserted. when that
> happens the laptop doesn't want to shut down, and the forementioned
> problems
> occur even without a cable.
>
> i posted about it before.
> someone here on OLUG mentioned that there was a linux driver for my intel
> GB
> NIC that messes with the firmware.
> rather than be further frustrated with it, i just decided to just go
> wireless.
>
> your issues may not be related to either of these scenarios, but maybe you
> will find the information helpful
>
>
> does the live CD do the same thing? it does in my case.
>
>
> On Tue, Nov 25, 2008 at 11:18 AM, Obi-Wan <obiwan at jedi.com> wrote:
>
> > > Nov 24 23:14:53 enterprise kernel: [39484.816049] WARNING: at
> > > /build/buildd/linux-2.6.27/net/sched/sch_generic.c:219
> > > dev_watchdog+0x272/0x280()
> > > Nov 24 23:14:53 enterprise kernel: [39484.816054] NETDEV WATCHDOG:
> > > eth0 (r8169): transmit timed out
> > > Nov 24 23:14:54 enterprise kernel: [39485.632083] r8169: eth0: link up
> > > Nov 24 23:18:00 enterprise kernel: [39671.632044] r8169: eth0: link up
> > > Nov 24 23:21:30 enterprise kernel: [39881.632043] r8169: eth0: link up
> > > ...
> > > Nov 25 08:16:18 enterprise kernel: [71969.632044] r8169: eth0: link up
> > > Nov 25 08:17:30 enterprise kernel: [72041.632044] r8169: eth0: link up
> > > Nov 25 08:18:49 enterprise syslogd 1.5.0#2ubuntu6: restart.
> >
> > Hmmm... it looks like your link is bouncing up & down.  I think Dan
> > & Carl were on the right track.  Try a live CD, and if the same thing
> > happens (as I expect it will), you've probably got a hardware problem.
> > Try switching network ports in your switch if you have any to spare.
> > Try using a different NIC in your machine if you can.  The good news
> > is that this appears to be happening frequently enough that it shouldn't
> > take long to determine if you've fixed (or at least affected) the
> problem.
> >
> > --
> > Ben "Obi-Wan" Hollingsworth                             obiwan at jedi.com
> >   The stuff of earth competes for the allegiance I owe only to the
> >     Giver of all good things, so if I stand, let me stand on the
> >       promise that You will pull me through.  -- Rich Mullins
> > _______________________________________________
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> > OLUG at olug.org
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> >
>
>
>
> --
> dynatron digital services
> box 191 - 68037
> www.dynatron.org
> dynatron at gmail.com
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