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Re: [v6ops] draft-elkins-v6ops-ipv6-pdm-recommended-usage-00

Nalini Elkins <nalini.elkins@insidethestack.com> Sat, 31 August 2013 16:39 UTC

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Date: Sat, 31 Aug 2013 09:38:59 -0700
From: Nalini Elkins <nalini.elkins@insidethestack.com>
To: Randy Bush <randy@psg.com>
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Cc: IPv6 Ops WG <v6ops@ietf.org>, Al Morton <acmorton@att.com>
Subject: Re: [v6ops] draft-elkins-v6ops-ipv6-pdm-recommended-usage-00
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> If you are arguing that time synchronization cannot be done to the
> millisecond or microsecond level

> not arguing.  just trying to explain to you that a lot of engineering
> and research have shown that ntp, pee cees running unix or linux with
> gps, ... do not have millisecond accuracy on stamping packets over the
> net.  folk are trying to save you wasted effort.  

> randy


Appreciate the concern.

I would be quite interested to see this research.   Can you point me to some?

When you say " ntp, pee cees running unix or linux do not have millisecond accuracy on stamping packets"   do you mean that linux cannot timestamp a packet at microsecond level or that linux servers cannot synchronize to NTP at some level of milliseconds or something else entirely?

BTW, I remember at least one side conversation when I was at SharkFest (the WireShark conference) in June about the need for nano-second accuracy in WireShark packet captures.   Presumably, this is for non-Linux based systems.

Nalini

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