Re: [tram] Genart last call review of draft-ietf-tram-stun-pmtud-09

Marc Petit-Huguenin <petithug@acm.org> Mon, 17 September 2018 12:34 UTC

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To: Roni Even <ron.even.tlv@gmail.com>, gen-art@ietf.org
Cc: draft-ietf-tram-stun-pmtud.all@ietf.org, tram@ietf.org, ietf@ietf.org
References: <153597861719.13253.13043738114222950149@ietfa.amsl.com>
From: Marc Petit-Huguenin <petithug@acm.org>
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Date: Mon, 17 Sep 2018 05:33:54 -0700
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Subject: Re: [tram] Genart last call review of draft-ietf-tram-stun-pmtud-09
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Hi Roni,

Thank you for the review.

On 09/03/2018 05:43 AM, Roni Even wrote:
> Reviewer: Roni Even
> Review result: Ready with Nits
> 
> I am the assigned Gen-ART reviewer for this draft. The General Area
> Review Team (Gen-ART) reviews all IETF documents being processed
> by the IESG for the IETF Chair.  Please treat these comments just
> like any other last call comments.
> 
> For more information, please see the FAQ at
> 
> <https://trac.ietf.org/trac/gen/wiki/GenArtfaq>.
> 
> Document: draft-ietf-tram-stun-pmtud-??
> Reviewer: Roni Even
> Review Date: 2018-09-03
> IETF LC End Date: 2018-09-12
> IESG Telechat date: Not scheduled for a telechat
> 
> Summary:
> The documents is ready for publication as a standard track RFC with nits and
> minor issues
> 
> Major issues:
> 
> Minor issues:
> 
> 1. The security section says " The PMTUD mechanism described in this document
> does not introduce any
>    specific security considerations" yet section 5.1 talk about amplification
>    attack

Right, I thought that RFC 4821 covered that attack, but neither RFC 4821 or RFC 1981 do.

So I rewrote the first paragraph as:

"The PMTUD mechanism described in this document, when used without the
 signalling mechanism described in Section 5.1, does not introduce any
 specific security considerations beyond those described in [RFC4821]."

And added:

"The amplification attacks introduced by the signalling mechanism
 described in Section 5.1 can be prevented by using one of the
 techniques described in that section."

> 
> Nits/editorial comments:
> 
> 1.  In section 2 last paragraph "Probe Indications of various sizes" any
> guidelines about the sizes and how many indications?

The algorithm for choosing the size and numbers of indications is in RFC 4821, so there is no point of repeating that here.  But I changed the text to remind people that they must read RFC 4821:

"[...]
 chosen, then the Client sends Probe Indications of various sizes (as
 specified in [RFC4821]) interleaved with UDP packets sent by the UDP
 [...]"

> 
> 
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-- 
Marc Petit-Huguenin
Email: marc@petit-huguenin.org
Blog: https://marc.petit-huguenin.org
Profile: https://www.linkedin.com/in/petithug