[ntp:questions] Re: requestor's time; transmit timestamp?

Dirk Claessens will.bounce at ntp.isc.org
Sun Nov 27 09:59:19 UTC 2005

Verily, on Sun 27 Nov 2005 01:24:58a, Nelson Minar wrote in
[news:cpairufos2v.fsf at cabernet.nelson.monkey.org]: 

> In an NTP request which timestamp carries the requestor's notion
> of what time it is?

I ran into the same problem, a couple of months ago, because of this
definition in RFC 958:

Transmit Timestamp

      This is a 64-bit timestamp established by the server host and
      specifying the local time at which the reply departed for the
      client host.  If no request has ever arrived from the client the
      value is zero.

I should have also read RFC2030, which says:

   To calculate the roundtrip delay d and local clock offset t relative
   to the server, the client sets the **transmit timestamp** in the request
   to the time of day according to the client clock in NTP timestamp
   format. The server copies this field to the originate timestamp in
   the reply and sets the receive timestamp and transmit timestamp to
   the time of day according to the server clock in NTP timestamp


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