[ntp:questions] how to have offset < 1ms

lhommedumatch ludocluba at yahoo.com
Wed Apr 14 21:49:26 UTC 2010


On 14 avr, 19:54, Rob <nom... at example.com> wrote:
> lhommedumatch <ludocl... at yahoo.com> wrote:
> > Hi,
>
> > Some news:
> >      remote           refid      st t when poll reach   delay
> > offset  jitter
> > ==============================================================================
> > *ntpgmtaceb      .1PPS.           1 u  734 1024  377   29.779
> > 1.182   0.228
>
> > So still this problem in my LAN => because delay is too high
>
> > Don't know if it helps but a ping to ntpgmtaceb:
> > PING ntpgmtaceb (192.168.21.5) 56(84) bytes of data.
> > 64 bytes from ntpgmtaceb (192.168.21.5): icmp_seq=1 ttl=63 time=0.128
> > ms
> > 64 bytes from ntpgmtaceb (192.168.21.5): icmp_seq=2 ttl=63 time=0.137
> > ms
> > 64 bytes from ntpgmtaceb (192.168.21.5): icmp_seq=3 ttl=63 time=0.155
> > ms
> > 64 bytes from ntpgmtaceb (192.168.21.5): icmp_seq=4 ttl=63 time=0.139
> > ms
>
> > My PC is connected to a CISCO Catalyst 4510R as well as the ntp server
> > clock.
>
> Can you try to setup another NTP client system, a completely different
> computer connected at another point in the network, and check what the
> delay is there?  Maybe such a system already exists elsewhere on the
> ship.  It seems that there is a problem somewhere but it is unclear where.
>
> The fact that ping works ok probably indicates the problem is not in
> the network, or maybe it only occurs when the system is idle.  When you
> start pinging, something wakes up and stays alive while you ping, but
> when it is sleeping (e.g. some "powersave" mode) the delay is longer.
>
> Is the system this NTP is running on active on the network?
> Maybe you can keep the ping running in the background and check if things
> work better when you do that.
>
> What is this "ntpgmtaceb"?   A special NTP device, a general purpose
> system that may be heavily loaded?  Is it running Windows or some Unix
> variant?

This is ntpgmt aceb. they don't have the english version.
http://www.aceb-elec.com/sofy_EXP320.htm




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