[ntp:questions] NTP behind NAT

Steve Kostecke kostecke at ntp.isc.org
Fri Apr 6 17:26:07 UTC 2007

On 2007-04-06, Danny Mayer <mayer at ntp.isc.org> wrote:
> Steve Kostecke wrote:
>> On 2007-04-06, Spoon <devnull at localhost.com> wrote:
>>> Does an NTP server keep track of who it has replied to?
>> ntpd does not maintain any state information pertaining to the polls
>> that it has answered.
> Not quite true. See ntpdc -c monlist which tells you which clients have
> queried it.

Yes, ntpd does keep a list of the last 600 clients that have polled it
(including some minimal information about the clients).

But the polls themselves are stateless from the server point of view.
The server merely answers the poll; the client does the work of
analyzing the poll information.

Steve Kostecke <kostecke at ntp.isc.org>
NTP Public Services Project - http://ntp.isc.org/

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