LAN slow or dead, intermittently

Janos Dohanics web at
Tue Jun 28 13:32:33 UTC 2016

On Mon, 27 Jun 2016 08:50:56 -0400
Ernie Luzar <luzar722 at> wrote:

> Janos Dohanics wrote:
> > Hello List,
> > 
> > Please help me figure out what makes my LAN intermittently slow or
> > just about dead.
> > 
> > [...]
> I also had performance problems with 10.3 that did not happen with
> 10.2 and older releases. When the lan went dead I had to reboot the
> host system to get things working again because users were on my
> back. I never let this condition exist to see if it would resolve it
> self.
> My first solution was to go back to using 10.2 and everything was
> fine. One evening I swapped the hosts 10.2 hard drive with the 10.3
> hard drive so I could test some more. Just by luck I checked the date
> & time by issuing the "date" command. The date was correct but the
> time was -2 hours off. I manually set the correct time using the
> "date" command and let 10.3 run as production. With in 5 days the lan
> network was having performance problems again. I checked the host
> time and it was off by -30 minutes. I replaced the host motherboard
> battery with a new one and manually set the correct time again.
> Things ran ok for about 2 weeks when it happened again. This time the
> time was off by -2 minutes.
> This time I enabled the base ntpd time daemon by adding this to
> rc.conf ntpd_enable="YES"
> ntpd_sync_on_start="YES"
> Since then 10.3 has been running ok [2 months now]. I think some
> thing in the network stack code changed between 10.2 and 10.3 that
> made the time sync between lan nodes and the host, time range
> dependent.
> I would say that checking the time on your host and all the machines
> on the lan would be a good place to start looking for your problem.
> Good luck

Well, date(1) shows a time which seems reasonably correct... it didn't
occur to me that an inaccurate clock could also be the cause of the
kind of problem I described. Thanks anyway...

Janos Dohanics

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