RE: No Escape - ntp

["Albertson, Chris" <CAlbertson@primeadvantage.com>]

> -----Original Message-----
> From: Paul Repacholi [mailto:prep@prep.synonet.com]> 
> 
> > My warning about SNTP was not to use it over the Internet.  It works
> > reasonably well on a local network if you have a stable NTP server.
> 
> This is not so. I am running throught the net now to 2 Stratum 1
> servers.  Tere are also 2 NAT conversions on the route. They give
> references less that 1 ms apart. One is in the same city, one on the
> other side of the country.

You are correct NTP works well over the Internet even
with a dial up connection and a slow modem.  

It is SNTP that doesn't work so well over the Internet.
That "S" stands for "Simple".  SNTP was intended for desktop
PCs.

Both or OK for casual use but only NTP is for critical
time keeping where milli or micro seconds count.

I found an article were someone using NTP had this "annoying"
problem were his clock is 100 nanoseconds slow.  It turned
out that he was clocking off the wrong edge of a PPS signal that
was 100ns wide.  You don't hear SNTP uses gripping about
100ns errors.