[ntp:questions] Local time sources

Jaap Winius jwinius at umrk.nl
Sun May 9 19:29:23 UTC 2010

Hi all,

When configuring a typical ntpd system, the recommended minimum number of 
server entries in ntp.conf for NTP time sources seems to be three, 
apparently because this way ntpd can calculate an average time, eliminate 
the server furthest from the average, and then still have two left for a 
final selection that depends on other values, such as jitter.

However, what is the recommended minimum number for systems that only 
work with local time sources, such as GPS devices and time signal radio 
receivers, that each supply their own timing information as well? Is one 
always enough, or are there still advantages other than redundancy in 
having more than one?



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