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

Nalini Elkins <nalini.elkins@insidethestack.com> Fri, 30 August 2013 01:36 UTC

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Date: Thu, 29 Aug 2013 18:36:14 -0700
From: Nalini Elkins <nalini.elkins@insidethestack.com>
To: joel jaeggli <joelja@bogus.com>, "MORTON JR., ALFRED C (AL)" <acmorton@att.com>, IPv6 Ops WG <v6ops@ietf.org>, "tsv-area@ietf.org" <tsv-area@ietf.org>
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Cc: "joachim.fabini@tuwien.ac.at" <joachim.fabini@tuwien.ac.at>, "trammell@tik.ee.ethz.ch" <trammell@tik.ee.ethz.ch>
Subject: Re: [v6ops] draft-elkins-v6ops-ipv6-pdm-recommended-usage-00
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On 8/29/13 5:47 AM, Nalini Elkins wrote:
> Please take a look at:
>
> http://www.ripe.net/data-tools/stats/ttm/test-traffic-measurement-service
>
>
> Note that what they provide is:
>
>     * NTP-server, the test-boxes can act a stratum 1 server for the machines on your network, providing time-stamps with an accuracy of 10 microseconds.
>With respect to the IETF 87 presentation/discussion I think is is a
>dicussion of the quality of time and it relationship to the general
>utility of of pdm optional header, not the availability of specific
>point solutions.

Let me back up and see if I can restate your basic concern in simple words so that I am sure that I understand you.

I believe that you are concerned that the timestamps provided by NTP will not be accurate enough if the timestamps are taken from more than one administrative domain.   Our PDM proposal depends on fairly reliable timestamps.  So, if the timestamps are not reliable, then the PDM is not very useful.

Please let me know if I have understood you.

Thanks,
Nalini

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