[ntp:questions] frequency adjusting only

Greg Dowd GDowd at symmetricom.com
Fri May 2 15:35:40 UTC 2008


At a guess, it's the correlation that had a period of 2 wks.  I'd guess
it as a harmonic of a week somehow.  But who knows.  That's the problem
with lrd.

  
Greg Dowd
gdowd at symmetricom dot com (antispam format)
Symmetricom, Inc.
www.symmetricom.com
"Everything should be made as simple as possible, but no simpler" Albert
Einstein
 

> -----Original Message-----
> From: questions-bounces+gdowd=symmetricom.com at lists.ntp.org 
> [mailto:questions-bounces+gdowd=symmetricom.com at lists.ntp.org]
>  On Behalf Of Brian Utterback
> Sent: Friday, May 02, 2008 7:38 AM
> To: questions at lists.ntp.org
> Subject: Re: [ntp:questions] frequency adjusting only
> 
> David L. Mills wrote:
> 
> > Suspecting such could be the case between NTP servers and 
> clients, I 
> > designed an experiment to detect such things and found small but 
> > significant LRD effects with lags up to TWO WEEKS! At short 
> lags up to 
> > several network turns this can be explained by packet lengths, 
> > buffering, retransmissions, etc., but at much longer lags 
> you have to 
> > look for routing flaps, provisioning changes, etc.
> > 
> 
> Dave, are you saying that you saw an instance of a NTP 
> response arriving 2 weeks after the request was sent?
> 
> Brian Utterback
> 
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