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Re: Usable extension headers [Re: New Version Notification for draft-voyer-6man-extension-header-insertion-08.txt]

Tim Chown <Tim.Chown@jisc.ac.uk> Thu, 28 November 2019 07:46 UTC

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From: Tim Chown <Tim.Chown@jisc.ac.uk>
To: Brian E Carpenter <brian.e.carpenter@gmail.com>
CC: "Manfredi (US), Albert E" <albert.e.manfredi@boeing.com>, 6MAN <6man@ietf.org>
Subject: Re: Usable extension headers [Re: New Version Notification for draft-voyer-6man-extension-header-insertion-08.txt]
Thread-Topic: Usable extension headers [Re: New Version Notification for draft-voyer-6man-extension-header-insertion-08.txt]
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Date: Thu, 28 Nov 2019 07:46:44 +0000
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On 28 Nov 2019, at 04:27, Brian E Carpenter <brian.e.carpenter@gmail.com> wrote:
> 
> Hi Bert,
> On 28-Nov-19 16:34, Manfredi (US), Albert E wrote:
>> -----Original Message-----
>> From: ipv6 <ipv6-bounces@ietf.org> On Behalf Of Brian E Carpenter
>> 
>>> As I experienced years ago when my Ph.D. student was making real-world experiments with SHIM6, and as RFC7872 reported too, it's an observed fact that the Internet isn't transparent to packets with extension headers, not even to currently standardised ones. The same appears to have been true for IPv4 Options for at least 25 years. So, to be honest, I have no idea how to change that for the open Internet. We seem to be stuck with a lowest common denominator network layer.
>> 
>> Isn't the problem that routers must mostly not mess with these extension headers?
> 
> "Mostly" isn't good enough. It needs to be 100%. It only takes one router or middlebox on the path to be allergic to extension headers, and that's what we see in practice.

In RFC 7872 we tried to determine where the drops were happening, on a “best case” / “worst case” basis, whether it was in the destination AS or a transit AS.

We also tested against Alexa Top N targets for www, dns and mx, where perhaps Andrew’s tests were between end systems that were more “cooperative” across intermediate open / transit networks, so his values would be more akin to the “best case” numbers.

Certainly not a bad time to re-run tests, and maybe run tests between co-operative end points/domains.  Nearly 4 years have passed since the RFC7872 tests were run.  How much have things changed?

Tim

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