I would like to point out that Glen Turner discovered my ... uh, deliberate mistake. I meant, of course, that you use the PPS driver (22) for PPS, and the SHM driver (28) for GPS, and you don't use the NMEA driver (20) at all, unless reasons.
I have mentioned that I owe Glen a beverage of their choice next time we are in beverage-providing proximity. --Rob On Sun, 25 Aug 2019 at 18:54, Rob Thomas <[email protected]> wrote: > > I was rebuilding my local network over the weekend, and as part of > that I had to relocate and reconfigure my Stratum 1 NTP server. As I > was fine turning it, I discovered a significant number of Au NTP > servers are misconfigured, and I thought I'd post a few quick tips > here, for anyone providing a timing source, and using a GPS signal as > Stratum 0. > > 1. If you're not using PPS triggers, PLEASE DON'T MARK YOURSELF AS A > STRATUM 1 SERVER! Put this in your /etc/ntpd.conf: > > server 127.127.28.0 minpoll 4 maxpoll 4 stratum 2 > fudge 127.127.28.0 time1 0.135 refid GPS > > (Obviously adjusting your time1 amount to match whatever the delay of > your GPS chip is) > > 2. If you ARE using PPS triggers, make sure that is flagged 'prefer'. > This means that when you run `ntpq -n -p` you will have a * by 28.2 > .PPS. > > 3. You MUST be using the SHM driver (127.127._28_.x), not the NMEA > driver (127.127._22_.x) for anything even slightly accurate. > > 4. If you're doing this on a Pi, please feel free to message me > offlist and I will happily spend some time with you setting up a > complete working config to make your own Stratum 1 server. To get > your started, here's what I'm uising as my /etc/ntp.conf on my stratum > 1 server: https://pastebin.com/7c6P0aYv > > I'll also be doing some BoF's on Timekeeping at Linux.conf.au next > year, if anyone wants to nerd away about excessively accurate time > keeping for ensuring your logs are correct, and displayed in the > correct order. > > --Rob _______________________________________________ AusNOG mailing list [email protected] http://lists.ausnog.net/mailman/listinfo/ausnog
