Re: [Pearg] [Secdispatch] Numeric IDs: Update to RFC3552

Fernando Gont <fgont@si6networks.com> Fri, 19 April 2019 09:15 UTC

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To: Hannes Tschofenig <Hannes.Tschofenig@arm.com>, Eric Rescorla <ekr@rtfm.com>
Cc: "pearg@irtf.org" <pearg@irtf.org>, IETF SecDispatch <secdispatch@ietf.org>, =?UTF-8?Q?Iv=c3=a1n_Arce_=28Quarkslab=29?= <iarce@quarkslab.com>, "secdispatch-chairs@ietf.org" <secdispatch-chairs@ietf.org>
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From: Fernando Gont <fgont@si6networks.com>
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Date: Fri, 19 Apr 2019 11:15:34 +0200
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Subject: Re: [Pearg] [Secdispatch] Numeric IDs: Update to RFC3552
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On 19/4/19 09:07, Hannes Tschofenig wrote:
> Hi Fernando,
> 
> I am not sure why it is important for you to update RFC 3552. The argument that it requires specification authors to consider your document in security and privacy considerations is not IMHO not correct.
> If you document provides useful guidance then it should stand on its own.
> 
> A few random comments from looking at it:
> 
> - FWIW you should be re-using terms defined in RFC 6973, such as identifier.
> - Why are you acknowledging yourself in your own draft?
> - You use the RFC 2119 term as requirements for protocol authors rather than for interoperability. I think you should mention this in the terminology section somewhere or not use RFC2119 language.

As an example:

If you look at the requirements for ephemeral ports in RFC793 or RFC768,
they are underspecified -- only the interoperability requirements are
specified, and the implementer has to figure out the algorithm
himself/herself. --- RFC6056 complements that.

OTOH, the IPv6 Fragment ID generation in RFC2460 is overspecified: a
global counter is suggested, leading to predictable Frag IDs, unnecessarily.

IN both cases, there were implementations with predictable port numbers
and predictable IPv6 Frag IDs.

In the former case, because doing incremental port numbers was an easy
way to comply with the*interoperability* requirements -- and the spec
doesn't consider the predictability aspec.

In the later case, the spec itself suggests an inappropriate IPv6 Frag
ID generation algorithm.

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