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[ippm] need of sync of clocks in dup metric def

Hi Henk,

> > The methodology (section 2.6) of the draft refers to section 2.6 of
> > RFC2680 which speaks about sync of clocks:
> >
> > Is the sync of clocks really needed for detecting packet
duplication?
> 
> No, actually this is one of the things that suprised me as well in
> RFC2680.  Does anybody remember why this is in 2680?

My understanding of the philosophy of RFCs 2679 & 80 is that a packet
arriving very very late is an excellent packet lost. Seriously, the
definition of the packet loss requires the time the packet is sent
because there is not any local (on the receiver) event available to
start the timeout timer.

Packet duplication differs. The reference of time for waiting a copy is
the arrival of a first image of the packet. So it does rely on any
remote time.


Regards
Emile

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