> Am 30.03.2016 um 10:21 schrieb [email protected]: > > >> > The main reasoning here was, I believe, that an inherent solution > >would be > >> > easier to tailor to a time synchronization protocol's special > >needs, > >> > particularly for the additional delays caused by the > >cryptographic > >> > operations on time-sensitive packets to be small (and ideally > >> > symmetrical). > >> > > >> > >> OK, that's interesting. > >> Can you please elaborate on the symmetrical requirement? > > > >I assume that he's talking about the time between getting T1 and > >sending out the packet, and getting T3 and sending it out would > >need about the same delay. > > For the record: yes, this is what I was talking about. > > > > >I also assume that to be able to get a very accurate results. But > >if that's the case I think they're going about this the wrong way. > >I think for most cases the overhead of the crypto is not going to > >have an impact on the results because there is just way more > >jitter on the network. For the cases this matters both sides > >should take an additional timestamp when the packet was really sent, > >and have a follow up packet that contains the correct time. > > This would be a very clean solution, but my impression was always that NTP > did not offer follow-up type messages (as a reminder: for NTS, we try to not > require modifications to the specification of the underlying time sync > protocol). Am I wrong about his? > This is correct. NTP as specified in RFC 5905 does not have the concept of a follow up message, like for example PTP. I assume
> > For > >the cases where this matters, they should already be doing this. > > > > > >Kurt > > > >_______________________________________________ > >ntpwg mailing list > >[email protected] > >http://lists.ntp.org/listinfo/ntpwg > > > _______________________________________________ > TICTOC mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/tictoc
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