Resuming the great cleanup

Achim Gratz Stromeko at
Tue May 29 19:37:49 UTC 2018

Eric S. Raymond via devel writes:
> Achim Gratz via devel <devel at>:
>> However, there is still value in the knowledge of which interface the
>> packet came in so that ntpd can place different levels of trust
>> depending on whether it's from a private (virtual) network segement, an
>> internal or public network.
> If I'm following the argument, this exactly what oacket filter should do.

I don't quite follow how you propose to do that with a packet filter?
At least I'm not aware of any packet filter that makes trust decisions
that are not binary.

>> Also, this information would potentially be
>> quite valuable to get a better grip on asymmetric network delays, which
>> are dominating the residual timing error on many types of networks these
>> days.
> How?  Can you explain that more?

Provided you somehow route the packets from different networks to
different (virtual) interfaces, you could measure and eventually
compensate the asymmetry associated with that particular network
provided you have some trusted time server on each side of the

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