On Wed, Oct 28, 2020 at 06:27:42AM +1100, mgrosve...@gmail.com wrote:

> Furthermore, some switches (Eg Arista and and Cisco) use the CRC to
> convey timestamps in packets. It would be absolutely necessary to be
> able to see the “CRC” for this this use case, on the same interface
> that PTP traffic traverses, even if PTP traffic itself is
> unaffected.

But why would ptp4l need to see that "timestamp" ?

It doesn't use it at all.

What a switch does internally is its own business.

However, the end points need to receiver a proper Ethnernet frame with
a correct checksum.

Thanks,
Richard


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