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Luke
luked at pobox.com
Wed Mar 2 14:43:23 PST 2005
>> 1) NTP is difficult to configure. I've done it, but it wasn't trivial.
>
> It's always seemed rather straightforward to me, what in particular
> gave you trouble, perhaps we could help?
Well, there seemed to be two different services. One was something that
would run only on boot. The other was a daemon. The daemon seemed more
useful, especially for a system that shouldn't be rebooted often, but it
had a wide variety of configuration options. The NTP server that I found
to connect to insisted that I not connect to it more frequently than X,
and X was a longer time interval than was defined in the default setup, so
I had to mess around with it.
It's been almost a year since I tried to set this up, so I don't remember
anything more specific than that. If the NTP server I was using had been
a bit more permissive, I probably could've used the default configuration
without changes.
>> 2) Finding an NTP server willing to accept traffic from the public isn't
>> easy either. For me it involved a scavenger hunt through out-of-date
>> websites and a lot of failed attempts.
>
> time.nist.gov is public, and has it's own atomic clock. A google
> search for "public ntp servers" also found this: http://www.pool.ntp.org/
Thanks for the tip! I remember seeing www.pool.ntp.org before, but I
misunderstood what it was for.
>> 3) If your clock tends to run noticably fast or slow, constant NTP
>> corrections tend to do more harm than good, at least in my experience. It
>> got to where I couldn't even run a buildworld because NTP kept tinkering
>> with the clock in the middle of the process.
>
> That suggests larger problems on your system, to me, but I dunno.
You're right. This machine did have serious problems. The clock was
wild. Using the NTP daemon to try to correct it just aggravated the
situation because calibration was just about impossible.
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