| Re: [chrony-dev] SW/HW timestamping on Linux |
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On Mon, Nov 21, 2016 at 11:25:10AM -0800, Denny Page wrote:
> On Nov 21, 2016, at 10:59, Miroslav Lichvar <mlichvar@xxxxxxxxxx> wrote:
> > So, in order to make this as simple as possible, we could make an
> > assumption that received packets have the same format as transmitted
> > packets. At least with VLANs this might work more often than not.
>
> It really doesn’t have anything to do with the packet as we sent it. VLANS and IP options can be added along the way. We only need to look at the packet as received in order to correct the receive timestamp. The transmit timestamp is already correct.
The trouble is we have only transmitted ethernet frames, not received.
--
Miroslav Lichvar
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