Re: ntp problem in broadcastclients
- Date: Wed, 24 Oct 2018 19:16:36 -0400
- From: rhkramer@xxxxxxxxx
- Subject: Re: ntp problem in broadcastclients
On Wednesday, October 24, 2018 07:10:00 PM rhkramer@xxxxxxxxx wrote:
> On Wednesday, October 24, 2018 06:25:46 PM Gene Heskett wrote:
> > On Wednesday 24 October 2018 11:07:05 rhkramer@xxxxxxxxx wrote:
> > > I think that covers what I was going to say, but in an attempt to show
> > > off my knowledge (or lack thereof) ;-)
> > >
> > > As I understand it, NTP tries to get an approximate correct time for
> > > each client machine by doing something like measuring the round trip
> > > time to the server and back, then dividing by two, and applying that
> > > as a correction to the broadcast time from the NTP server.
> > >
> > > That was my understanding "back in the day" and I assume something
> > > similar is still occurring.
> > >
> > > On the other hand, it is hard to imagine that computers on your LAN
> > > have a latency anywhere near 70 seconds in communication from your NTP
> > > "server" on the same LAN (the one broadcasting the time).
> > Standard pings are in the 1 millisecond range.
> Not the problem, for sure!
Just a further thought, along similar line:
I vaguely have the impression (from posts you've made in the past) that you do
things to make the LAN fast (for your CNC stuff) like use static IPs, and
probably use those IPs rather than any names that have to be resolved, so I
doubt that is a problem -- I guess I just mentioned it for posterity.