[olug] Ubuntu losing network

[DYNATRON tech]

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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>



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