Recommended Number of NTP Servers
hmurray at megapathdsl.net
Mon Nov 4 10:32:10 UTC 2019
Richard Laager said:
> The default for maxclock is 10. This includes the "pool" entries, of
> which the stock Debian configuration has four:
> pool 0.debian.pool.ntp.org iburst
> pool 1.debian.pool.ntp.org iburst
> pool 2.debian.pool.ntp.org iburst
> pool 3.debian.pool.ntp.org iburst
> As a result, the default is to use 6 pool servers.
The pool entries shouldn't be counted as servers. I don't know if refclocks
There is some hysteresis in there. When starting up, I'd expect that setup to
overshoot. pool DNS lookups return 4 hosts. pool 2 returns 4 each for IPv4
and IPv6. So after pool 0 it has 4, after pool 1 it has 8, and after pool 2
is has 16. Pool 3 may get 4 more if the ones from earlier work aren't "up"
yet. They get probed at 1 second intervals so there is a race between DNS
lookup and NTP processing.
I don't know if it throws extras away or waits for them to die off.
These are my opinions. I hate spam.
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