[ntp:questions] Fine tuning ntp.conf
unruh at invalid.ca
Sat Apr 27 00:18:15 UTC 2019
On 2019-04-26, jeliskoski at gmail.com <jeliskoski at gmail.com> wrote:
> On Friday, 26 April 2019 19:39:25 UTC+2, William Unruh wrote:
>> On 2019-04-26, David Taylor <david-taylor at blueyonder.co.uk.invalid> wrote:
>> > On 26/04/2019 14:31, jeliskoski at gmail.com wrote:
>> >> Hi guys,
>> >> This is my config file for my NTP Stratum 2 server. Any suggestion for fine tuning will be appreciated.
>> > 
>> >> # Use public servers from the pool.ntp.org project.
>> >> # Please consider joining the pool (http://www.pool.ntp.org/join.html).
>> >> #server ntp.svilengrad.eu iburst
>> >> #server ntp.fizyka.umk.pl iburst
>> >> server ntp.bsdbg.net iburst
>> >> server ptbtime1.ptb.de iburst
>> >> server zeit.fu-berlin.de iburst
>> >> server ntp0.fau.de iburst
>> > 
>> > One comment - why not use the pool servers, as suggested? Replace your
>> > four lines with:
>> > pool de.pool.ntp.org minpoll 6 maxpoll 7 iburst
>> > You may find that some of the public servers you list may be overloaded,
>> > or come and go from time to time - the "pool" directive takes care of
>> > vanishing and overloaded servers.
>> One problem with the pool is that the servers have varying accuracy. If
>> you have carefully chosen your servers as having low uncertainty, then
>> your list might be better. But if you simply chose them randomly, then
>> the pool will probably be just as good.
> Yes, I tried with nearest to my country
That is one issue (it should tend to make the round trip time, and thus
the chances of assymetry) slightly lower. But I have found that sites
2000km away can be much better than some other sources 50 ft away. It
really depends on all the switches/routers/etc between you and the
source, and also what that source uses for its sources. For example one
might use GPS time with a really good GPS card, while the other might
use WWV. Both are stratum 1 sources, but on it a lot lot lot more
accurate than the other.
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