Transmission of IPv6 Packets over Near Field Communication
draft-ietf-6lo-nfc-16
The information below is for an old version of the document.
Document | Type |
This is an older version of an Internet-Draft that was ultimately published as RFC 9428.
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Authors | Younghwan Choi , Yong-Geun Hong , Joo-Sang Youn , Dongkyun Kim , JinHyeock Choi | ||
Last updated | 2020-07-09 | ||
Replaces | draft-hong-6lo-ipv6-over-nfc | ||
RFC stream | Internet Engineering Task Force (IETF) | ||
Formats | |||
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Additional resources | Mailing list discussion | ||
Stream | WG state | Submitted to IESG for Publication | |
Document shepherd | Carles Gomez | ||
Shepherd write-up | Show Last changed 2019-03-05 | ||
IESG | IESG state | Became RFC 9428 (Proposed Standard) | |
Consensus boilerplate | Yes | ||
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Responsible AD | Erik Kline | ||
Send notices to | Samita Chakrabarti <samitac.ietf@gmail.com>, Carles Gomez <carlesgo@entel.upc.edu> | ||
IANA | IANA review state | Version Changed - Review Needed |
draft-ietf-6lo-nfc-16
6Lo Working Group Y. Choi, Ed. Internet-Draft Y-G. Hong Intended status: Standards Track ETRI Expires: January 10, 2021 J-S. Youn Dongeui Univ D-K. Kim KNU J-H. Choi Samsung Electronics Co., July 9, 2020 Transmission of IPv6 Packets over Near Field Communication draft-ietf-6lo-nfc-16 Abstract Near Field Communication (NFC) is a set of standards for smartphones and portable devices to establish radio communication with each other by touching them together or bringing them into proximity, usually no more than 10 cm apart. NFC standards cover communications protocols and data exchange formats, and are based on existing radio-frequency identification (RFID) standards including ISO/IEC 14443 and FeliCa. The standards include ISO/IEC 18092 and those defined by the NFC Forum. The NFC technology has been widely implemented and available in mobile phones, laptop computers, and many other devices. This document describes how IPv6 is transmitted over NFC using 6LoWPAN techniques. Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at https://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on January 10, 2021. Choi, et al. Expires January 10, 2021 [Page 1] Internet-Draft IPv6 over NFC July 2020 Copyright Notice Copyright (c) 2020 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Conventions and Terminology . . . . . . . . . . . . . . . . . 3 3. Overview of Near Field Communication Technology . . . . . . . 3 3.1. Peer-to-peer Mode of NFC . . . . . . . . . . . . . . . . 3 3.2. Protocol Stacks of NFC . . . . . . . . . . . . . . . . . 4 3.3. NFC-enabled Device Addressing . . . . . . . . . . . . . . 5 3.4. MTU of NFC Link Layer . . . . . . . . . . . . . . . . . . 5 4. Specification of IPv6 over NFC . . . . . . . . . . . . . . . 6 4.1. Protocol Stacks . . . . . . . . . . . . . . . . . . . . . 6 4.2. Stateless Address Autoconfiguration . . . . . . . . . . . 7 4.3. IPv6 Link-Local Address . . . . . . . . . . . . . . . . . 8 4.4. Neighbor Discovery . . . . . . . . . . . . . . . . . . . 8 4.5. Dispatch Header . . . . . . . . . . . . . . . . . . . . . 9 4.6. Header Compression . . . . . . . . . . . . . . . . . . . 9 4.7. Fragmentation and Reassembly Considerations . . . . . . . 10 4.8. Unicast and Multicast Address Mapping . . . . . . . . . . 10 5. Internet Connectivity Scenarios . . . . . . . . . . . . . . . 11 5.1. NFC-enabled Device Connected to the Internet . . . . . . 11 5.2. Isolated NFC-enabled Device Network . . . . . . . . . . . 12 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 12 7. Security Considerations . . . . . . . . . . . . . . . . . . . 12 8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 13 9. Normative References . . . . . . . . . . . . . . . . . . . . 13 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 14 1. Introduction NFC is a set of short-range wireless technologies, typically requiring a distance between sender and receiver of 10 cm or less. NFC operates at 13.56 MHz, and at rates ranging from 106 kbit/s to 424 kbit/s, as per the ISO/IEC 18000-3 air interface [ECMA-340]. NFC Choi, et al. Expires January 10, 2021 [Page 2] Internet-Draft IPv6 over NFC July 2020 builds upon RFID systems by allowing two-way communication between endpoints. NFC always involves an initiator and a target; the initiator actively generates an RF field that can power a passive target. This enables NFC targets to take very simple form factors, such as tags, stickers, key fobs, or cards, while avoiding the need for batteries. NFC peer-to-peer communication is possible, provided that both devices are powered. As of the writing, NFC is supported by the main smartphone operating systems. NFC is often regarded as a secure communications technology, due to its very short transmission range. In order to benefit from Internet connectivity, it is desirable for NFC-enabled devices to support IPv6, considering its large address space, along with tools for unattended operation, among other advantages. This document specifies how IPv6 is supported over NFC by using IPv6 over Low-power Wireless Personal Area Network (6LoWPAN) techniques [RFC4944], [RFC6282], [RFC6775]. 6LoWPAN is suitable, considering that it was designed to support IPv6 over IEEE 802.15.4 networks, and some of the characteristics of the latter are similar to those of NFC. 2. Conventions and Terminology The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all capitals, as shown here. 3. Overview of Near Field Communication Technology This section presents an overview of NFC, focusing on the characteristics of NFC that are most relevant for supporting IPv6. NFC enables simple, two-way, interaction between two devices, allowing users to perform contactless transactions, access digital content, and connect electronic devices with a single touch. NFC utilizes key elements in existing standards for contactless card Technology, such as ISO/IEC 14443 A&B and JIS-X 6319-4. NFC allows devices to share information at a distance up to 10 cm with a maximum physical layer bit rate of 424 kbps. 3.1. Peer-to-peer Mode of NFC NFC defines three modes of operation: card emulation, peer-to-peer, and reader/writer. Only the peer-to-peer mode enables two NFC- enabled devices to communicate with each other to exchange Choi, et al. Expires January 10, 2021 [Page 3] Internet-Draft IPv6 over NFC July 2020 information and share files, so that users of NFC-enabled devices can quickly share contact information and other files with a touch. The other two modes does not support two-way communications between two devices. Therefore, the peer mode is used for ipv6-over-nfc. 3.2. Protocol Stacks of NFC NFC defines a protocol stack for the peer-to-peer mode (Figure 1). The peer-to-peer mode is made in Activities Digital Protocol in NFC Physical Lay. The NFC Logical Link consists of Binding for IPv6-LLCP and Logical Link Control Protocol Layer (LLCP). IPv6 and its underlying adaptation Layer (i.e., IPv6-over-NFC adaptation layer) are placed directly on the top of the IPv6-LLCP Binding. An IPv6 datagram is transmitted by the Logical Link Control Protocol (LLCP) with reliable, two-way transmission of information between the peer devices. +----------------------------------------+ ------------------ | IPv6-LLCP Binding | | +----------------------------------------+ NFC | | Logical Link | Logical Link Control Protocol | Layer | (LLCP) | | +----------------------------------------+ ------------------ | | | | Activities | | | Digital Protocol | NFC | | Physical +----------------------------------------+ Layer | | | | RF Analog | | | | | +----------------------------------------+ ------------------ Figure 1: Protocol Stack of NFC The LLCP consists of Logical Link Control (LLC) and MAC Mapping. The MAC Mapping integrates an existing RF protocol into the LLCP architecture. The LLC contains three components, such as Link Management, Connection-oriented Transmission, and Connection-less Transmission. The Link Management component is responsible for serializing all connection-oriented and connection-less LLC PDU (Protocol Data Unit) exchanges and for aggregation and disaggregation of small PDUs. The Connection-oriented Transmission component is responsible for maintaining all connection-oriented data exchanges including connection set-up and termination. The Connectionless Choi, et al. Expires January 10, 2021 [Page 4] Internet-Draft IPv6 over NFC July 2020 Transmission component is responsible for handling unacknowledged data exchanges. In order to send an IPv6 packet over NFC, the packet MUST be passed down to the LLCP layer of NFC and carried by an Information (I) or an Unnumbered Information (UI) Field in an LLCP Protocol Data Unit (PDU). LLCP does not support fragmentation and reassembly. For IPv6 addressing or address configuration, LLCP MUST provide related information, such as link layer addresses, to its upper layer. The LLCP to IPv6 protocol binding MUST transfer the SSAP and DSAP value to the IPv6 over NFC protocol. SSAP stands for Source Service Access Point, which is a 6-bit value meaning a kind of Logical Link Control (LLC) address, while DSAP means an LLC address of the destination NFC-enabled device. Thus, SSAP is a source address, and DSAP is a destination address. 3.3. NFC-enabled Device Addressing According to NFC Logical Link Control Protocol v1.3 [LLCP-1.3], NFC- enabled devices have two types of 6-bit addresses (i.e., SSAP and DSAP) to identify service access points. Several service access points can be installed on a NFC device. However, the SSAP and DSAP can be used as identifiers for NFC link connections with the IPv6 over NFC adaptation layer. Therefore, the SSAP can be used to generate an IPv6 interface identifier. Address values between 00h and 0Fh of SSAP and DSAP are reserved for identifying the well-known service access points, which are defined in the NFC Forum Assigned Numbers Register. Address values between 10h and 1Fh are assigned by the local LLC to services registered by local service environment. In addition, address values between 20h and 3Fh are assigned by the local LLC as a result of an upper layer service request. Therefore, the address values between 20h and 3Fh can be used for generating IPv6 interface identifiers. 3.4. MTU of NFC Link Layer As mentioned in Section 3.2, when an IPv6 packet is transmitted, the packet MUST be passed down to LLCP of NFC and transported to an Unnumbered Information Protocol Data Unit (UI PDU) and an Information Field in Protocol Data Unit (I PDU) of LLCP of the NFC-enabled peer device. The information field of an I PDU contains a single service data unit. The maximum number of octets in the information field is determined by the Maximum Information Unit (MIU) for the data link connection. The default value of the MIU for I PDUs is 128 octets. The local and remote LLCs each establish and maintain distinct MIU values for each data link connection endpoint. Also, an LLC may Choi, et al. Expires January 10, 2021 [Page 5] Internet-Draft IPv6 over NFC July 2020 announce a larger MIU for a data link connection by transmitting an optional Maximum Information Unit Extension (MIUX) parameter within the information field. If no MIUX parameter is transmitted, the MIU value is 128 bytes. Otherwise, the MTU size in NFC LLCP MUST be calculated from the MIU value as follows: MTU = MIU = 128 + MIUX. According to [LLCP-1.3], Figure 2 shows an example of the MIUX parameter TLV. The Type and Length fields of the MIUX parameter TLV have each a size of 1 byte. The size of the TLV Value field is 2 bytes. 0 0 1 2 3 0 8 6 2 1 +----------+----------+------+-----------+ | Type | Length | Value | +----------+----------+------+-----------+ | 00000010 | 00000010 | 1011 | 0x0~0x7FF | +----------+----------+------+-----------+ Figure 2: Example of MIUX Parameter TLV When the MIUX parameter is used, the TLV Type field MUST be 0x02 and the TLV Length field MUST be 0x02. The MIUX parameter MUST be encoded into the least significant 11 bits of the TLV Value field. The unused bits in the TLV Value field MUST be set to zero by the sender and ignored by the receiver. The maximum possible value of the TLV Value field is 0x7FF, and the maximum size of the LLCP MTU is 2176 bytes. If fragmentation functionality is not used at the adaptation layer between IPv6 and NFC, the MIUX value MUST be 0x480 to support the IPv6 MTU requirement (of 1280 bytes). 4. Specification of IPv6 over NFC NFC technology also has considerations and requirements owing to low power consumption and allowed protocol overhead. 6LoWPAN standards [RFC4944], [RFC6775], and [RFC6282] provide useful functionality for reducing overhead which can be applied to NFC. This functionality consists of link-local IPv6 addresses and stateless IPv6 address auto-configuration (see Section 4.2), Neighbor Discovery (see Section 4.4) and header compression (see Section 4.6). 4.1. Protocol Stacks Figure 3 illustrates IPv6 over NFC. Upper layer protocols can be transport layer protocols (e.g., TCP and UDP), application layer protocols, and others capable of running on top of IPv6. Choi, et al. Expires January 10, 2021 [Page 6] Internet-Draft IPv6 over NFC July 2020 | | | Upper Layer Protocols | +----------------------------------------+ | IPv6 | +----------------------------------------+ | Adaptation Layer for IPv6 over NFC | +----------------------------------------+ | NFC Link Layer | +----------------------------------------+ | NFC Physical Layer | +----------------------------------------+ Figure 3: Protocol Stack for IPv6 over NFC The adaptation layer for IPv6 over NFC supports neighbor discovery, stateless address auto-configuration, header compression, and fragmentation & reassembly, based on 6LoWPAN. 4.2. Stateless Address Autoconfiguration An NFC-enabled device performs stateless address autoconfiguration as per [RFC4862]. A 64-bit Interface identifier (IID) for an NFC interface is formed by utilizing the 6-bit NFC SSAP (see Section 3.3). In the viewpoint of address configuration, such an IID should guarantee a stable IPv6 address during the course of a single connection, because each data link connection is uniquely identified by the pair of DSAP and SSAP included in the header of each LLC PDU in NFC. Following the guidance of [RFC7136], interface identifiers of all unicast addresses for NFC-enabled devices are 64 bits long and constructed by using the generation algorithm of random (but stable) identifier (RID) [RFC7217] (see Figure 4). 0 1 3 4 6 0 6 2 8 3 +---------+---------+---------+---------+ | Random (but stable) Identifier (RID) | +---------+---------+---------+---------+ Figure 4: IID from NFC-enabled device The RID is an output which is created by the algorithm, F() with input parameters. One of the parameters is Net_Iface, and NFC Link Layer address (i.e., SSAP) is a source of the Net_Iface parameter. The 6-bit address of SSAP of NFC is easy and short to be targeted by attacks of third party (e.g., address scanning). The F() can provide secured and stable IIDs for NFC-enabled devices. In addition, an Choi, et al. Expires January 10, 2021 [Page 7] Internet-Draft IPv6 over NFC July 2020 optional parameter, Network_ID is used to increase the randomness of the generated IID. 4.3. IPv6 Link-Local Address The IPv6 link-local address for an NFC-enabled device is formed by appending the IID, to the prefix FE80::/64, as depicted in Figure 5. 0 0 0 1 0 1 6 2 0 0 4 7 +----------+------------------+----------------------------+ |1111111010| zeros | Interface Identifier | +----------+------------------+----------------------------+ | | | <---------------------- 128 bits ----------------------> | | | Figure 5: IPv6 link-local address in NFC A 6LBR may obtain an IPv6 prefix for numbering the NFC network via DHCPv6 Prefix Delegation ([RFC3633]). The "Interface Identifier" can be a secured and stable IIDs. 4.4. Neighbor Discovery Neighbor Discovery Optimization for 6LoWPANs ([RFC6775]) describes the neighbor discovery approach in several 6LoWPAN topologies, such as mesh topology. NFC supports mesh topologies but most of all applications would use a simple multi-hop network topology or directly connected peer-to-peer network because NFC RF range is very short. o When an NFC-enabled 6LN is directly connected to an NFC-enabled 6LBR, the NFC 6LN MUST register its address with the 6LBR by sending a Neighbor Solicitation (NS) message with the Address Registration Option (ARO), and process the Neighbor Advertisement (NA) accordingly. In addition, when the 6LN and 6LBR are directly connected, DHCPv6 is used for address assignment. Therefore, Duplicate Address Detection (DAD) is not necessary between them. o When two or more NFC devices are connected, there are two cases. One is that three or more NFC devices are linked with multi-hop connections, and the other is that they meet within a single hop range (e.g., isolated network). In a case of multi-hop topology, devices which have two or more connections with neighbor devices, play a router for 6LR/6LBR. In a case that they meet within a Choi, et al. Expires January 10, 2021 [Page 8] Internet-Draft IPv6 over NFC July 2020 single hop and they have the same properties, any of them can be a router. o For sending Router Solicitations and processing Router Advertisements, the NFC 6LNs MUST follow Sections 5.3 and 5.4 of [RFC6775]. o When a NFC device is a 6LR or a 6LBR, the NFC device MUST follow Section 6 and 7 of [RFC6775]. 4.5. Dispatch Header All IPv6-over-NFC encapsulated datagrams are prefixed by an encapsulation header stack consisting of a Dispatch value. The only sequence currently defined for IPv6-over-NFC is the 6LOWPAN_IPHC header followed by payload, as depicted in Figure 6. +---------------+---------------+--------------+ | IPHC Dispatch | IPHC Header | Payload | +---------------+---------------+--------------+ Figure 6: A IPv6-over-NFC Encapsulated 6LOWPAN_IPHC Compressed IPv6 Datagram The dispatch value is treated as an unstructured namespace. Only a single pattern is used to represent current IPv6-over-NFC functionality. +------------+--------------------+-----------+ | Pattern | Header Type | Reference | +------------+--------------------+-----------+ | 01 1xxxxx | 6LOWPAN_IPHC | [RFC6282] | +------------+--------------------+-----------+ Figure 7: Dispatch Values Other IANA-assigned 6LoWPAN Dispatch values do not apply to this specification. 4.6. Header Compression Header compression as defined in [RFC6282], which specifies the compression format for IPv6 datagrams on top of IEEE 802.15.4, is REQUIRED in this document as the basis for IPv6 header compression on top of NFC. All headers MUST be compressed according to RFC 6282 encoding formats. Choi, et al. Expires January 10, 2021 [Page 9] Internet-Draft IPv6 over NFC July 2020 Therefore, IPv6 header compression in [RFC6282] MUST be implemented. Further, implementations MUST also support Generic Header Compression (GHC) of [RFC7400]. If a 16-bit address is required as a short address, it MUST be formed by padding the 6-bit NFC link-layer (node) address to the left with zeros as shown in Figure 8. 0 1 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Padding(all zeros)| NFC Addr. | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 8: NFC short address format 4.7. Fragmentation and Reassembly Considerations IPv6-over-NFC SHOULD NOT use fragmentation and reassembly (FAR) for the payloads as discussed in Section 3.4. The NFC link connection for IPv6 over NFC MUST be configured with an equivalent MIU size to fit the MTU of IPv6 Packet. The MIUX value is 0x480 in order to fit the MTU (1280 bytes) of a IPv6 packet if NFC devices support extension of the MTU. 4.8. Unicast and Multicast Address Mapping The address resolution procedure for mapping IPv6 non-multicast addresses into NFC link-layer addresses follows the general description in Section 4.6.1 and 7.2 of [RFC4861], unless otherwise specified. The Source/Target link-layer Address option has the following form when the addresses are 6-bit NFC link-layer (node) addresses. 0 1 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Length=1 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | +- Padding (all zeros) -+ | | +- +-+-+-+-+-+-+ | | NFC Addr. | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 9: Unicast address mapping Choi, et al. Expires January 10, 2021 [Page 10] Internet-Draft IPv6 over NFC July 2020 Option fields: Type: 1: for Source Link-layer address. 2: for Target Link-layer address. Length: This is the length of this option (including the type and length fields) in units of 8 octets. The value of this field is 1 for 6-bit NFC node addresses. NFC address: The 6-bit address in canonical bit order. This is the unicast address the interface currently responds to. The NFC Link Layer does not support multicast. Therefore, packets are always transmitted by unicast between two NFC-enabled devices. Even in the case where a 6LBR is attached to multiple 6LNs, the 6LBR cannot do a multicast to all the connected 6LNs. If the 6LBR needs to send a multicast packet to all its 6LNs, it has to replicate the packet and unicast it on each link. 5. Internet Connectivity Scenarios NFC networks can either be isolated or connected to the Internet. The NFC link between two communicating devices is considered to be a point-to-point link only. An NFC link does not support a star topology or mesh network topology but only direct connections between two devices. The NFC link layer does not support packet forwarding in link layer. 5.1. NFC-enabled Device Connected to the Internet Figure 10 illustrates an example of an NFC-enabled device network connected to the Internet. The distance between 6LN and 6LBR is typically 10 cm or less. If there is any laptop computers close to a user, it will become a 6LBR. Additionally, when the user mounts an NFC-enabled air interface adapter (e.g., portable NFC dongle) on the close laptop PC, the user's NFC-enabled device (6LN) can communicate with the laptop PC (6LBR) within 10 cm distance. Choi, et al. Expires January 10, 2021 [Page 11] Internet-Draft IPv6 over NFC July 2020 ************ 6LN ------------------- 6LBR -----* Internet *------- CN | | ************ | | | | | <------ NFC Link -----> | <----- IPv6 packet ------> | | (dis. 10 cm or less) | | Figure 10: NFC-enabled device network connected to the Internet Two or more 6LNs are connected with a 6LBR, but each connection uses a different subnet. The 6LBR is acting as a router and forwarding packets between 6LNs and the Internet. Also, the 6LBR MUST ensure address collisions do not occur and forwards packets sent by one 6LN to another. 5.2. Isolated NFC-enabled Device Network In some scenarios, the NFC-enabled device network may transiently be a simple isolated network as shown in the Figure 11. 6LN 6LN | | NFC link -> | NFC -> | (dist. 10 cm or less) | (dist. 10 cm or less) | | | 6LN ---------------------- 6LR ---------------------- 6LR NFC Link NFC Link (dist. 10 cm or less) (dist. 10 cm or less) Figure 11: Isolated NFC-enabled device network 6. IANA Considerations There are no IANA considerations related to this document. 7. Security Considerations There are the intrinsic security properties of NFC due to its short link range. When interface identifiers (IIDs) are generated, devices and users are required to consider mitigating various threats, such as correlation of activities over time, location tracking, device- specific vulnerability exploitation, and address scanning. IPv6-over-NFC uses an IPv6 interface identifier formed from a "Short Address" and a set of well-known constant bits for the modified EUI-64 format. However, NFC applications use short-lived Choi, et al. Expires January 10, 2021 [Page 12] Internet-Draft IPv6 over NFC July 2020 connections, and a different address is used for each connection, where the latter is of extremely short duration. 8. Acknowledgements We are grateful to the members of the IETF 6lo working group. Michael Richardson, Suresh Krishnan, Pascal Thubert, Carsten Bormann, Alexandru Petrescu, James Woodyatt, Dave Thaler, Samita Chakrabarti, Gabriel Montenegro and Carles Gomez Montenegro have provided valuable feedback for this document. 9. Normative References [ECMA-340] "Near Field Communication - Interface and Protocol (NFCIP- 1) 3rd Ed.", ECMA-340 , June 2013. [LLCP-1.3] "NFC Logical Link Control Protocol version 1.3", NFC Forum Technical Specification , March 2016. [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, <https://www.rfc-editor.org/info/rfc2119>. [RFC3633] Troan, O. and R. Droms, "IPv6 Prefix Options for Dynamic Host Configuration Protocol (DHCP) version 6", RFC 3633, DOI 10.17487/RFC3633, December 2003, <https://www.rfc-editor.org/info/rfc3633>. [RFC4861] Narten, T., Nordmark, E., Simpson, W., and H. Soliman, "Neighbor Discovery for IP version 6 (IPv6)", RFC 4861, DOI 10.17487/RFC4861, September 2007, <https://www.rfc-editor.org/info/rfc4861>. [RFC4862] Thomson, S., Narten, T., and T. Jinmei, "IPv6 Stateless Address Autoconfiguration", RFC 4862, DOI 10.17487/RFC4862, September 2007, <https://www.rfc-editor.org/info/rfc4862>. [RFC4944] Montenegro, G., Kushalnagar, N., Hui, J., and D. Culler, "Transmission of IPv6 Packets over IEEE 802.15.4 Networks", RFC 4944, DOI 10.17487/RFC4944, September 2007, <https://www.rfc-editor.org/info/rfc4944>. Choi, et al. Expires January 10, 2021 [Page 13] Internet-Draft IPv6 over NFC July 2020 [RFC6282] Hui, J., Ed. and P. Thubert, "Compression Format for IPv6 Datagrams over IEEE 802.15.4-Based Networks", RFC 6282, DOI 10.17487/RFC6282, September 2011, <https://www.rfc-editor.org/info/rfc6282>. [RFC6775] Shelby, Z., Ed., Chakrabarti, S., Nordmark, E., and C. Bormann, "Neighbor Discovery Optimization for IPv6 over Low-Power Wireless Personal Area Networks (6LoWPANs)", RFC 6775, DOI 10.17487/RFC6775, November 2012, <https://www.rfc-editor.org/info/rfc6775>. [RFC7136] Carpenter, B. and S. Jiang, "Significance of IPv6 Interface Identifiers", RFC 7136, DOI 10.17487/RFC7136, February 2014, <https://www.rfc-editor.org/info/rfc7136>. [RFC7217] Gont, F., "A Method for Generating Semantically Opaque Interface Identifiers with IPv6 Stateless Address Autoconfiguration (SLAAC)", RFC 7217, DOI 10.17487/RFC7217, April 2014, <https://www.rfc-editor.org/info/rfc7217>. [RFC7400] Bormann, C., "6LoWPAN-GHC: Generic Header Compression for IPv6 over Low-Power Wireless Personal Area Networks (6LoWPANs)", RFC 7400, DOI 10.17487/RFC7400, November 2014, <https://www.rfc-editor.org/info/rfc7400>. [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017, <https://www.rfc-editor.org/info/rfc8174>. Authors' Addresses Younghwan Choi (editor) Electronics and Telecommunications Research Institute 218 Gajeongno, Yuseung-gu Daejeon 34129 Korea Phone: +82 42 860 1429 Email: yhc@etri.re.kr Choi, et al. Expires January 10, 2021 [Page 14] Internet-Draft IPv6 over NFC July 2020 Yong-Geun Hong Electronics and Telecommunications Research Institute 161 Gajeong-Dong Yuseung-gu Daejeon 305-700 Korea Phone: +82 42 860 6557 Email: yghong@etri.re.kr Joo-Sang Youn DONG-EUI University 176 Eomgwangno Busan_jin_gu Busan 614-714 Korea Phone: +82 51 890 1993 Email: joosang.youn@gmail.com Dongkyun Kim Kyungpook National University 80 Daehak-ro, Buk-gu Daegu 702-701 Korea Phone: +82 53 950 7571 Email: dongkyun@knu.ac.kr JinHyouk Choi Samsung Electronics Co., 129 Samsung-ro, Youngdong-gu Suwon 447-712 Korea Phone: +82 2 2254 0114 Email: jinchoe@samsung.com Choi, et al. Expires January 10, 2021 [Page 15]