Re: [lp-wan] Éric Vyncke's Discuss on draft-ietf-lpwan-ipv6-static-context-hc-21: (with DISCUSS and COMMENT)

[<[e-mail]>]

Hello Eric,

Please see our proposed resolution of your comment about interleaving in
Section 8.
I believe we have now addressed all your DISCUSSes and Comments.
You can see the proposed changes on our github repo at
https://github.com/lp-wan/ip-compression/compare/df85983113ec9bcefe9ba3782a
e8a07edd1e6ef6...a1b49f480181986282694f0d02c7c6c569ee8c00
Best regards,

Dominique

Le 22/08/19 08:35, « Eric Vyncke (evyncke) » <[e-mail]> a écrit :

>Dominique,
>
>Thank you for your prompt reply and fixing most of my DISCUSSes &
>COMMENTs. Two are remaining open though.
>
>About my section 10.7.2 comment about sharing the information for RFC
>7217, while the 'shared secret' can obviously be shared out-of-band, I am
>no clue how the value of 'DAD Counter'  could be shared as it can vary
>from peer to peer and over time... For info, in case the hash algorithm
>generates a IID collision for one peer, this DAD Counter is incremented
>only on this peer to try another hash, and so on... If the authors have a
>way to share this DAD counter, then please explain it.
>
>I am afraid that I am keeping my DISCUSS open on this point. Sorry.
>
>About fragmentation & interleave in section 8, my point if that:
>- subsection 8.2.4 comes a little late and only indicate the interleaving
>of fragments
>- nothing is said about interleaving of fragments (even with DTag == 0)
>and non-fragmented packets.
DB: in the same Section 8.2.4, under the Rule ID bullet point, we state
      "The Rule ID allows SCHC F/R interleaving non-fragmented SCHC
      Packets and SCHC Fragments that carry other SCHC Packets, or
      interleaving SCHC Fragments that use different SCHC F/R modes or
      different parameters."
It seems to me this describes interleaving of fragments and non-fragmented
packets.
Anyway, we propose to add in Section 8.1 Overview
NEW TEXT
This specification provides protocol elements that make it possible to
interleave the transmission of non-fragmented SCHC Packets and fragmented
SCHC Packets, as well as interleave the transmission of fragmented SCHC
Packets. A Profile MAY restrict this behaviour.


>
>-éric
>PS: and indeed, I made some cut & paste error for my DISCUSS on section
>3.2, sorry about that.
>
>
>On 21/08/2019, 18:24, "[e-mail]"
><[e-mail]> wrote:
>
>    Hello Eric, all,
>    
>    Thanks for your time reading and commenting on this draft.
>    Please see my responses/questions inline.
>    Best regards
>    
>    Dominique
>    
>    Le 21/08/19 15:18, « Éric Vyncke via Datatracker » <[e-mail]>
>a
>    écrit :
>    
>    >Éric Vyncke has entered the following ballot position for
>    >draft-ietf-lpwan-ipv6-static-context-hc-21: Discuss
>    >
>    >The document, along with other ballot positions, can be found here:
>    
>>https://datatracker.ietf.org/doc/draft-ietf-lpwan-ipv6-static-context-hc/
>    >
>    >
>    >
>    
>>----------------------------------------------------------------------
>    >DISCUSS:
>    
>>----------------------------------------------------------------------
>    >
>    >Thank you for the hard work put into this extensive document. I have
>a
>    >couple
>    >of DISCUSSes and COMMENTs, all easy to be fixed except perhaps the
>DISCUSS
>    >around secrion 10.7.2.
>    >
>    >Regards,
>    >
>    >-éric
>    >
>    >== DISCUSS ==
>    >
>    >
>    >-- Section 10.3 --
>    >I am not a transport expert but I wonder whether the text "ECN
>    >functionality
>    >depends on both bits of the ECN field,..." is at the right place?
>Section
>    >10.2
>    >would appear better to me but again I am not an transport/ECN expert.
>    DB: oops, totally right. I made a mistake when adding these lines
>    (contributed by David Black).
>    I'll move them to 10.2 where they belong.
>    Because 10.2 and 10.3 have very similar text, the mistake was not
>visible
>    on the diff, which I heavily rely on.
>    
>    >
>    >-- Section 10.7.2 --
>    >It is unclear to me how the gateway and the device can share the
>required
>    >'shared secret' and especially the 'DAD counter' of RFC 7217... This
>    >render the
>    >2 paragraph confusing at best and possibly impossible to implement.
>    DB: I believe that the gateway and the device (I would say the SCHC
>    Compressor and SCHC Decompressor) can share them, because they need to
>    share a lot of stuff (the "Context") anyway.
>    Installing the 'shared secret' and 'DAD counter' should be no
>different
>    than installing pre-shared network keys or the set of compression
>rules,
>    it seems to me.
>    I will read RFC7217 again with you question in mind and come back
>later. I
>    will also consult among the co-authors.
>    
>    >
>    >
>    
>>----------------------------------------------------------------------
>    >COMMENT:
>    
>>----------------------------------------------------------------------
>    >
>    >Thank you for the hard work put into this extensive document. I have
>a
>    >couple
>    >of DISCUSSes and COMMENTs, all easy to be fixed except perhaps the
>DISCUSS
>    >around secrion 10.7.2.
>    >
>    >Regards,
>    >
>    >-éric
>    >
>    >== COMMENTS ==
>    >
>    >-- Section 8 --
>    >Several F/R modes are defined but none is specified as mandatory to
>    >implement.
>    >Is it worth repeating that the 'out-of-band' initialization of
>devices
>    >include
>    >the selected mode(s) ?
>    DB: thanks for this suggestion. I'll look into it.
>    
>    >
>    >-- section 8 --
>    >It is unclear to me whether multiple fragmented packets can be sent
>in
>    >parallel
>    >with other fragmented or non-fragmented packets (such as fragment &
>    >interleave
>    >in order to deliver a small packet with priority). Some text around
>this
>    >feature (or lack of feature) would be welcome.
>    DB: It seems to me that the description of DTag in 8.2.4 provides the
>    answer to your question.
>    Maybe you're saying that it arrives late into Section 8, and that a
>short
>    mention of the feature would be useful in the intro of Section 8?
>    
>    >
>    >-- section 10.8 --
>    >If you refer to 'extension headers', then use the complete wording
>    >'extension
>    >headers' rather than 'extensions'.
>    DB: thanks, will do.
>    
>    >
>    >== NITS ==
>    >
>    >-- Section 8.4 --
>    >Multiple figures are referred to but do not appear on the same page
>as the
>    >reference. This hinders the reading.
>    DB: thanks for the comment. I'll see if/how I can coerce our
>toolchain to
>    do better (we're using Mmark https://github.com/miekg/mmark)
>    
>    >
>    >-- section 10.9 --
>    >s/port/ports/ in the title
>    DB: will do
>    >
>    
>    
>    
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