[ntp:questions] client configuration: it's sufficient 3 servers ?
david-taylor at blueyonder.co.uk.invalid
Fri May 24 13:43:05 UTC 2013
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
I hope that each internal server is stratum-1, and has a separate
GPS/PPS reference or other source.
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