Re: [v6ops] Some stats on IPv6 fragments and EH filtering on the Internet

Fernando Gont <fgont@si6networks.com> Tue, 05 November 2013 03:05 UTC

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Date: Mon, 04 Nov 2013 18:49:08 -0800
From: Fernando Gont <fgont@si6networks.com>
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To: Tim Chown <tjc@ecs.soton.ac.uk>, Jen Linkova <furry13@gmail.com>
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Cc: "v6ops@ietf.org" <v6ops@ietf.org>
Subject: Re: [v6ops] Some stats on IPv6 fragments and EH filtering on the Internet
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On 11/04/2013 06:21 PM, Tim Chown wrote:
> 
>> On Tue, Nov 5, 2013 at 2:31 AM, Tim Chown <tjc@ecs.soton.ac.uk> wrote:
>>>> does the above results show the _network_ dropping fragments, or the end host or a system closely associated with the end host dropping extension headers?
>>>
>>> For mine, the test was simply whether the HTTP request solicited a response.
>>
>> It could be verified by checking the hop limit from the your machine
>> to the server you are testing and then vary the hop limits of probe
>> packets - so you can see when you stop receiving 'time exceeded’.
> 
> Modifying traceroute itself to slip in some extension headers might be useful?  Much as you can check DSCP rewrites, for example.

FWIW, I'm in the process of updating the toolkit to support this sort of
thing.. Should have something along these lines shortly.

Thanks,
-- 
Fernando Gont
SI6 Networks
e-mail: fgont@si6networks.com
PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492