Hi Younghwan,
Thanks a lot for your responses!
Cheers,
Carles
> Thanks a lot for your comments.
>
> I'm Younghwan Choi, one of the authors of I-D., draft-ietf-6lo-nfc-03.
>
> 1. about simple multi-hop topology..
>
> First of all, NFC supports only direct connections between two devices in
> link layers. For the connections, three types of the NFC modes, "p2p, tag
> read/write, card emulation mode" can be used. However, ipv6-over-nfc can
> be only achieved by p2p mode ("p2p mode" is just named by NFC-Forum
> (http://nfc-forum.org/what-is-nfc/what-it-does/, this is a little bit
> different from "p2p communications between two endpoints in network
> layers" we usually say). If needed, I'm going to reflect your comment to
> clarify meaning of p2p in NFC-forum in next version (-04). Thanks. :)
> Thus, p2p mode in NFC-Forum does not mean multi-hop topology. However, by
> using ipv6-over-nfc adaptation layer, we can make multi-hop topologies
> with 3 or more nfc-enabled devices with routing-over approach.
>
> 2. about Fragmentation..
>
> At the beginning of this draft, we didn't think of extended MTU in NFC
> link layer. So NFC link layer should be supported from ipv6-over-nfc
> fragmentation schemes at that time. However, at the 3rd version (-02) of
> the draft, contexts about extended MTU of NFC were added, and FAR was not
> necessary any more. At that time, "Since LLCP does not support
> fragmentation and reassembly, upper layers SHOULD support fragmentation
> and reassembly." should've been revised. Next version (-04) is going to
> reflect this. :) Thanks again.
>
> 3. Minor stuff
>
> I will also reflect the typo, "BT-LE" to "NFC" in section 4. Thanks :)
>
> BRs,
> Younghwan Choi
>
> -----Original Message-----
> From: 6lo [mailto:[email protected]] On Behalf Of Carles Gomez
> Montenegro
> Sent: Wednesday, May 18, 2016 4:48 PM
> To: [email protected]
> Cc: [email protected]
> Subject: [6lo] Comments on draft-ietf-6lo-nfc-03
>
> Dear authors of draft-ietf-6lo-nfc-03,
>
> I have a few comments about this draft:
>
> 1. "Simple multi-hop topology"
> ******************************
>
> In 4.2 and 4.5 you mention that NFC networks may follow the "peer-to-peer
> topology and simple multi-hop topology". I think the multi-hop topology
> requires a little bit of clarification:
>
> - What is understood as a "simple multi-hop topology" as opposed to the
> "complicated mesh topology" mentioned in the document?
>
> - Would the simple multi-hop topology follow the mesh-under or the
> route-over approach?
>
> - Does NFC define mechanisms for the formation of multi-hop topologies?
>
> (Depending on the responses, the multi-hop functionality in RFC 6775 may
> be needed.)
>
>
> 2. Fragmentation
> ****************
>
> In section 3.2, you mention:
>
> "Since LLCP does not support fragmentation and reassembly, upper layers
> SHOULD support fragmentation and reassembly."
>
> However, section 4.8 says that RFC 4944 fragmentation is not required. Is
> maybe the text in section 3.2 pending an update?
>
>
> 3. Minor
> ********
>
> Section 4, 4th line: s/BT-LE/NFC
>
>
> Thanks!
>
> Carles
>
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