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
_______________________________________________
6lo mailing list
[email protected]
https://www.ietf.org/mailman/listinfo/6lo
_______________________________________________
6lo mailing list
[email protected]
https://www.ietf.org/mailman/listinfo/6lo
