On 24/05/2013 09:12, Riccardo Castellani wrote:
If I have 3 internal NTP servers, what do you think if my clients have all
these 3 servers in their configuration ?
According to '5.3.2. Why should I have
more than one clock?' in
'http://www.ntp.org/ntpfaq/NTP-s-algo-real.htm#Q-NTP-ALGO
I read 2 servers, it's worst case, but also 3...
Riccardo, to cover the case where both remaining servers would be reject
were one out of three to fail, I would suggest that you should have four
internal servers minimum. However, if your clients are also allowed to
use the pool directive, seeing external servers where many more servers
will be allocated to each client, then three internal likely would
suffice, depending on what OS and what timekeeping requirements you have.
So I would have all three internal servers, plus a pool directive in the
client configuration file, something like:
server 192.168.0.1 iburst
server 192.168.0.2 iburst
server 192.168.0.3 iburst
pool uk.pool.ntp.org
I hope that each internal server is stratum-1, and has a separate
GPS/PPS reference or other source.
--
Cheers,
David
Web: http://www.satsignal.eu
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