[ntp:questions] Re: uk pool problem

Danny Mayer mayer at ntp.isc.org
Thu Aug 31 03:00:40 UTC 2006


Richard B. Gilbert wrote:
> Danny Mayer wrote:
>> Richard B. Gilbert wrote:
>>
>>> Is there an ntpd equivalent to ntpdate -du <server address>?
>>>
>>
>>
>> ntpd -gq
>>
>> with optional -c conffile if you don't want to use your default config
>> file. Make sure you have iburst on the server lines and don't bother
>> with either multicasting or broadcasting.
>>
>> Danny
>> _______________________________________________
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>> questions at lists.ntp.isc.org
>> https://lists.ntp.isc.org/mailman/listinfo/questions
>>
> 
> Danny,
> 
> I don't think that's equivalent!!
> 
> ntpdate -du  does NOT set the clock, it merely reports what it would
> have done had it been asked to set the clock.  That's the -d.  The -u
> causes it to use an unprivileged port so you can run it while ntpd is
> running.  Those options are useful for getting a peek at a server's
> notion of the correct time without configuring the server or affecting
> your clock in any way.
> 

What about reftime in the ntpq -c rv query?

> It's clearly possible for an otherwise sane server to produce an insane
> reply.  The case in point was easily detectable by looking at your
> calendar but this is the first such case I've encountered in something
> like three years of following this newsgroup.
> 

There are several unusual things about that server including IPv6-only
nameservers.

Danny



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