Re: [6lo] WG Last Call: draft-ietf-6lo-minimal-fragment-01

<> Thu, 09 May 2019 15:19 UTC

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To: Carles Gomez Montenegro <>, "" <>, "" <>
Thread-Topic: [6lo] WG Last Call: draft-ietf-6lo-minimal-fragment-01
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Subject: Re: [6lo] WG Last Call: draft-ietf-6lo-minimal-fragment-01
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Hello Carles, Shwetha, authors, all,

I've read draft-ietf-6lo-minimal-fragment-01.
It seems clear and well written.
I only have a few comments:

Section 1, Overview:
"Each fragment can be uniquely identified by the source and destination
link-layer addresses of the frame that carries it, and the datagram_tag."
It seems to me that "datagram_offset" should also be mentioned here as
contributing to uniquely identifying a fragment.

Section 2.2
"Assuming the topology from Figure 2, where nodes A, B, C and D all send
packets through node E." Incorrect grammatical construct.

Section 3
"Each VRB table entry can be 12 B (assuming 16-bit link-layer addresses)."
It is not immediately obvious to me why 12. I guess I could try to figure
it out.
But [ARTICLE] says 20. Probably under a different assumption.
Could you provide a detailed count, to spare the reader the exercise?
BTW, in [ARTICLE], it seems to me that some means and remembering which
fragment have already been forwarded are missing. The key sentence is
"After having forwarded the last fragment, node B clears that VRB entry",
but how does node B knows is has forwarded all fragments? The same comment
applies to draft-ietf-lwig-6lowpan-virtual-reassembly-01. But I'm
digressing here.

Section 7, references
Ref [ARTICLE] is dated 2009, I guess you mean 2019. Besides, I could only
find the HAL archive, I suppose this is accepted for publication, but not
published yet.
Oops, just saw that Georgios already uncovered this nit.

Best regards


Le 24/04/19 10:54, « 6lo on behalf of Carles Gomez Montenegro »
< on behalf of> a écrit :

>Dear 6lo WG,
>Authors of draft-ietf-6lo-minimal-fragment-01 expressed in IETF 104 that
>they believe that the document is ready for WGLC. No comments or
>objections were made in this regard.
>Therefore, this email starts a WGLC for
>The WGLC will end on Wednesday, 8th of May.
>Please provide your feedback on the document on the mailing list, even if
>it is just a short "looks good" statement.
>Thank you in advance.
>Shwetha and Carles
>6lo mailing list


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