[ntpwg] NTP Follow-up packet details

[STUART VENTERS]

Dave,

I'd like to understand your plan for NTP follow up timestamping.

 (On the ntp.org it appears that the details are still to be worked out.)

It appears that for a simple server to client time transfer,
    the following rules might cover it:

1) If the client receives a server packet with T3 < T2,
      then the server is using follow-up timestamping.
       (Which means that the T3 value is not for this transaction,
          but rather for the previous on in this session.)

2) A session is identified at by a unique set of
        server IP address and UDP port,
   and client IP address and UDP port.

3) Since we are only trying to transfer time to the client,
     the client doesn't need an accurate value for T1 in it's request packet,
       so we don't need follow-up for T1.


Are these rules reasonable / inline with what you were thinking?


Regards,

Stuart


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