[ntp:questions] Time of by 4 min
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Thu Mar 13 22:00:39 UTC 2014
greg.wayne.smith at gmail.com wrote:
> My Windows 2008 server pulls from us.pool.ntp.org and it's off by 4 min compared to time.gov.
If you are using _only_ pool.ntp.org servers,
I hope you are using the pool directive,
or at least four server detectives. e.g.
pool us.pool.ntp.org iburst preempt
server 0.us.pool.ntp.org iburst preempt
server 1.us.pool.ntp.org iburst preempt
server 2.us.pool.ntp.org iburst preempt
server 3.us.pool.ntp.org iburst preempt
Have you added e.g.:
server time.nist.gov iburst noselect
to your NTP servers, so you can get a real offset?
Then check your server with e.g.
ntpq -n -c "lpe" -c "las" -c "rv 0"
> It's just the time is off by 4 min compared to our cell phone providers.
> Sprint, ATT, T-mobile. And thus the students are in an uproar.
ATT uses its own NTP servers, 12.230.208.### & 12.230.209.###,
e.g. Some used by ATT cell phones, micro WAPs, ...
# server 18.104.22.168 iburst
# server 22.214.171.124 iburst
# server 126.96.36.199 iburst
# server 188.8.131.52 iburst
I'm certain other carriers do the same,
Apple has their own for their cell phones, ipads, ...
Re: If your students are referencing http://time.gov/ , see http://time.gov/aboutB.html
This web site is intended as a time-of-day service only.
It should not be used to measure frequency or time interval,
nor should it be used to establish traceability to NIST or the USNO.
I think the http://time.gov/ Graphics time if likely to be within seconds,
much less minutes.
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