> email@example.com (Michael Bendzick) wrote in message
>> I'm running Red Hat 7.3, and have NTP configured with 4 servers currently.
>> I have been watching the NTP traffic as it crosses my firewall, and I am
>> finding that traffic to and back from each server happens roughly once a
>> minute. The clock is currently off by about 16 seconds as best as I can
>> tell. As it drifts closer to the correct time, will the frequency of
>> network requests drop, or is it normal to query NTP servers this
You can regulate this with maxpoll and minpoll server options, however after
the start ntpd will poll the servers every 64 seconds and slow down to 1024
These options specify the minimum and maximum poll intervals for NTP
messages, in seconds as a power of two. The maximum poll interval
defaults to 10 (1,024 s), but can be increased by the maxpoll option to
an upper limit of 17 (36.4 h). The minimum poll interval defaults to 6
(64 s), but can be decreased by the minpoll option to a lower limit of 4
> I'm not sure which version of ntpd is included on the Red Hat 7.3
> distribution. When the time is off by 16 seconds, it should take about 9
> hours to slew the time to within the normal NTP tolerances. I recommend you
> change the ntpd startup command line options to allow ntpd to step the clock
> when it starts initially. The option should should be -g.
> Best Wishes,
Sicherheit gibt es nicht umsonst - zu keiner Zeit und nirgendwo!
(Das BSI IT-Sicherheitshandbuch)