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Re: Last Call: <draft-ietf-6man-rfc1981bis-04.txt> (Path MTU Discovery for IP version 6) to Internet Standard

"Eggert, Lars" <lars@netapp.com> Fri, 03 February 2017 10:23 UTC

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From: "Eggert, Lars" <lars@netapp.com>
To: "otroan@employees.org" <otroan@employees.org>
Subject: Re: Last Call: <draft-ietf-6man-rfc1981bis-04.txt> (Path MTU Discovery for IP version 6) to Internet Standard
Thread-Topic: Last Call: <draft-ietf-6man-rfc1981bis-04.txt> (Path MTU Discovery for IP version 6) to Internet Standard
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Date: Fri, 03 Feb 2017 10:22:42 +0000
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Cc: "tsv-area@ietf.org" <tsv-area@ietf.org>, "draft-ietf-6man-rfc1981bis@ietf.org" <draft-ietf-6man-rfc1981bis@ietf.org>, 6man WG <ipv6@ietf.org>, "ietf@ietf.org" <ietf@ietf.org>, "6man-chairs@ietf.org" <6man-chairs@ietf.org>
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On 2017-2-3, at 11:21, Lars Eggert <lars@netapp.com> wrote:
> PDF here: https://www.caida.org/~mjl/pubs/measuring-pmtud.pdf
> 
> "This paper measures PMTUD behaviour for
> 50,000 popular websites and finds the failure rate in IPv4
> is much less than previous studies. We measure the overall
> failure rate between 5% and 18%, depending on the MTU of
> the constraining link."
> 
> 5-18% is pretty bad. I would expect that the widespread deployment of CGNs since this was published in 2010 to not have improved things.

And yeah, this is for v4. I'm not aware of v6 measurements in this space.

Lars

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