check_ntp_peer parsing error

[Marc Haber]

On Sat, Jun 29, 2013 at 04:01:55PM +0200, Holger Weiß wrote:
> JFTR:
> * Marc Haber <mh+nagios-users at zugschlus.de> [2013-06-26 21:22]:
> > I have a system running Debian oldstable with Nagios-Plugins 1.4.15. A
> > few weeks ago, my check_ntp_peer checks have started acting up:
> > 
> > $ /usr/lib/nagios/plugins/check_ntp_peer --hostname=2001:1b18:f:4::2 --warning 3 --critical 5 --jwarn 10 --jcrit 20 --twarn 2: --tcrit 3: --swarn 2 --scrit 2 -v
> > 3 candidate peers available
> > synchronization source found
> > Getting offset, jitter and stratum for peer e20a
> > parsing offset from peer e20a: error: unable to read server offset response.
> > parsing jitter from peer e20a: error: unable to read server jitter/dispersion response.
> > parsing stratum from peer e20a: error: unable to read server stratum response.
> > NTP CRITICAL: Offset unknown, jitter=-1,000000, stratum=-1, truechimers=6| jitter=-1,000000;10,000000;20,000000;0,000000 stratum=-1;2;2;0;16 truechimers=6;0;0;0
> 
> This is probably caused by a bug in Force10 switches mentioned here:
> 
> http://news.ntppool.org/2013/06/ipv6-monitoring-problems-for-g.html
> 
> Due to that bug, the check_ntp_peer requests got duplicated on their way
> to the server, and the server therefore sent multiple responses per
> request.  check_ntp_peer then stumbled over those duplicated responses.
> That's a bug, I'll fix it later today.
> 
> Thanks to Marc for providing tcpdump output and for his help with
> tracking the issue down.

This was really fun to investigate. Thanks for help ans inspiration.

Greetings
Marc

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