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Re: [spring] Request to close the LC and move forward//RE: WGLC - draft-ietf-spring-srv6-network-programming

Mark Smith <markzzzsmith@gmail.com> Thu, 27 February 2020 08:23 UTC

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From: Mark Smith <markzzzsmith@gmail.com>
Date: Thu, 27 Feb 2020 19:23:03 +1100
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To: Dirk Steinberg <dirk@lapishills.com>
Cc: Fernando Gont <fgont@si6networks.com>, "Eric Vyncke (evyncke)" <evyncke=40cisco.com@dmarc.ietf.org>, SPRING WG List <spring@ietf.org>, "6man@ietf.org" <6man@ietf.org>, John Leddy <john@leddy.net>, Bob Hinden <bob.hinden@gmail.com>, "Zafar Ali (zali)" <zali=40cisco.com@dmarc.ietf.org>, Warren Kumari <warren@kumari.net>
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Subject: Re: [spring] Request to close the LC and move forward//RE: WGLC - draft-ietf-spring-srv6-network-programming
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On Thu, 27 Feb 2020 at 18:52, Dirk Steinberg <dirk@lapishills.com> wrote:
>
>
>
> On Thu, Feb 27, 2020 at 1:45 AM Fernando Gont <fgont@si6networks.com> wrote:
>>
>> Hello, Eric,
>>
>> On 26/2/20 20:18, Eric Vyncke (evyncke) wrote:
>> > Writing this without any hat,
>> >
>> > Please note that on the logical side, it still have to be "proven" that this idea is strictly forbidden by RFC 8200.
>>
>> Here's the proof part:
>>
>> 1) Isn't IPv6 end to end?
>>
>> 2) How do core components of IPv6, such as AH and PMTUD work in the
>> present of intermediate nodes that can add and/or remove arbitrary
>> extension headers?
>>
>> It should be clear from the above that EH insertion/deletion is forbidden.
>
>
> As I already explained to you this is not true.
> The wording of RFC8200 clearly allows this.
> The node addresses by the DA of the packet can do this.

Can you quote this text please?

Can you also explain why AH considers the fields necessary to do this
- the Next Header and Payload Length - immutable, and would consider
such packet modification within the network to be an attack?

> I understand that you would like to modify the wording of
> RFC8200 to make your point true but it simply is not.
> Repeating a false statement does not make it true.
>
> Cheers
> Dirk
>
>>
>> Since this topic has been brought up again and again, I have submitted
>> an errata to RFC8200 which clarifies the intended behaviour:
>> * https://www.rfc-editor.org/errata/eid5933
>>
>> (that's what Errata's are for, after all... and it should be clear that
>> the EH processing part, overall, needs improvements).
>>
>> Thanks!
>>
>> Cheers,
>> --
>> Fernando Gont
>> SI6 Networks
>> e-mail: fgont@si6networks.com
>> PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492
>>
>>
>>
>>
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>
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