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So, if you have a GPS device hooked to, say, a Mikrotik Router (which I have done previously) and use that GPS for NTP time, is it 18 seconds off, or is there m
by tiernano 4y ago
So, if you have a GPS device hooked to, say, a Mikrotik Router (which I have done previously) and use that GPS for NTP time, is it 18 seconds off, or is there magic? Or, say, the same for a Linux box using GPS for NTP?
- saurik 4y agoThe software should know how to convert between GPS and UTC, the same as it might perform any other time zone offset versions.
- the_mitsuhiko 4y ago> So, if you have a GPS device hooked to, say, a Mikrotik Router (which I have done previously) and use that GPS for NTP time, is it 18 seconds off, or is there magic? The GPS signal pre-announces upcoming leap seconds a few months in advance. Devices can then use that information to correctly adjust the difference in time.
- toast0 4y agoIt's quite possible to setup an NTP server that uses GPS time as UTC and it will be however many seconds off and cause all sorts of fun[1]. That shouldn't be easy to do though, as others said, the adjustment is broadcast and a reasonable receiver should do it out of the box. [1] A lot of programmers like to order events by system time. This is dangerous normally, but NTP helps sweep most of the danger under the rug. If some of your NTP servers serve UTC and some show GPS time, you're almost guaranteed to have very messy system time across your fleet and anything that expects orderly time is out of luck.