It was 300ns. I’ve tried several different switches, each with differing 
results, although I didn’t run long enough to be be absolutely sure they would 
not settle to the same number. With my main Cisco switch I’m seeing the 8 hour 
average at 298.858ns. Such a precise number. I don’t have an explanation for 
this yet, but I am confident it’s not bit transmission time. I am going to set 
up a span port to capture the packets on both interfaces which may give an 


> On Nov 21, 2016, at 09:52, Miroslav Lichvar <mlich...@redhat.com> wrote:
> I think your own experiments showed there is a 350 ns offset :). That
> would be 700 extra nanoseconds in the B->A direction.

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