[ntp:questions] ntpdate function

Jacek Igalson (at) jacek.igalsonorange.com
Thu Apr 18 09:26:42 UTC 2013


Uzytkownik "unruh" <unruh at invalid.ca> napisal w wiadomosci 
news:BbWat.406388$O52.29723 at newsfe10.iad...
> On 2013-04-15, Jacek Igalson <jacek.igalson> wrote:
>> In fact, I have used offset,
>> delay is recorded by the way.
>> It indicates how asymmetric might be the trip.
>
> No. It says nothing about the asymmetry. Just about the delay. Now you
> might make the assumption that a longer delay is probably a delay in
> only one leg of the path, implying asymmetry (which is what ntpd does in
> its clock filter algorithm) and that might often be a reasonable
> assumption, expecially if the delay is is say twice as long as usual, it
> is often a very bad assumption for slightly longer delays.
>

Upper limit of the asymmetry is delay. At least we know that value.




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