[ntp:questions] Very rapid polling

Danny Mayer mayer at ntp.isc.org
Tue Feb 10 03:26:06 UTC 2009

jlevine wrote:
> In the last few days I have seen an increasing number of systems that
> are requesting the time in NTP format several times per second. This
> poll interval is far in excess of the usual best practices. Since
> there are a number of such systems, it is possible that this problem
> is a result of a new version of NTP that has just been released.
> Please let me know if you have any information about a new version of
> NTP that can do this or if any of you are seeing the same problem.
> Thanks.
> Judah Levine
> Time and Frequency Division
> NIST Boulder

Hi Judah,

There is no new release yet (the 4.2.4p6 was just a patch release to fix
a couple or minor issues mainly related to OpenSSL. It is most unlikely
that ntp is doing this. Did you take a couple of the addresses and query
them with ntpq? I don't think that ntpd can be configured to query that
quickly. Harlan is preparing a new stable release from the development
branch. Dave has added KOD code to deal with situations like this and
such clients are likely to find their clock drifting off if the do not
follow the protocols.


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