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 AusNOG@lists.ausnog.net http://lists.ausnog.net/mailman/listinfo/ausnog
