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Simple Homenet Naming and Service Discovery Architecture

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This is an older version of an Internet-Draft whose latest revision state is "Expired".
Authors Ted Lemon , Daniel Migault , Stuart Cheshire
Last updated 2017-10-30
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Network Working Group                                           T. Lemon
Internet-Draft                                       Barefoot Consulting
Intended status: Informational                                D. Migault
Expires: May 3, 2018                                            Ericsson
                                                             S. Cheshire
                                                              Apple Inc.
                                                        October 30, 2017

        Simple Homenet Naming and Service Discovery Architecture


   This document describes a simple name resolution and service
   discovery architecture for homenets, using the '' domain
   name hierarchy.  This architecture covers local publication of names,
   as well as name resolution service for local and global names for
   devices connected to the homenet.

   This document does not cover discovery of homenet services by devices
   not connected to the homenet, nor DNSSEC, nor acquisition and
   configuration of a global name as an alternative to ''.
   These topics will be addressed in a separate document.

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
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   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 May 3, 2018.

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   ( 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
     1.1.  Existing solutions  . . . . . . . . . . . . . . . . . . .   4
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Name Resolution . . . . . . . . . . . . . . . . . . . . . . .   5
     3.1.  Configuring Resolvers . . . . . . . . . . . . . . . . . .   5
     3.2.  DNS Service Discovery Registration Protocol . . . . . . .   6
     3.3.  Configuring Service Discovery . . . . . . . . . . . . . .   6
     3.4.  Resolution of local names . . . . . . . . . . . . . . . .   8
     3.5.  Globally Unique Name  . . . . . . . . . . . . . . . . . .  10
     3.6.  DNSSEC Validation . . . . . . . . . . . . . . . . . . . .  10
     3.7.  Support for Multiple Provisioning Domains . . . . . . . .  10
     3.8.  Using the Local Namespace While Away From Home  . . . . .  11
   4.  Management Considerations . . . . . . . . . . . . . . . . . .  11
   5.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .  11
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  11
   7.  IANA considerations . . . . . . . . . . . . . . . . . . . . .  11
   8.  Normative References  . . . . . . . . . . . . . . . . . . . .  12
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  13

1.  Introduction

   This document describes a simple architecture for providing name
   service and service discovery for homenets.  This allows hosts
   connected to the homenet to use the Domain Name System to discover
   services and the hosts providing those services, whether they are on
   the home network or the Internet.  In addition, the architecture
   provides a way for hosts connected to the homenet that provide
   services to advertise those services for discovery by other homenet

   This simple architecture is intended to serve as a foundational
   architecture for naming on home networks.  It is expected that all
   Homenet routers will implement this architecture.  It satisfies a
   subset of the requirements listed in IPv6 Home Networking
   Architecture Principles [7], and provides a foundation for completely
   addressing those requirements.

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   This simple architecture leaves the following requirements from
   RFC7368 Section 3.7 unaddressed:

   o  Acquisition of a global name for the homenet, to be used in place
      of ''

   o  Delegation of public reverse trees for prefixes delegated to the
      homenet: subdomains of '' and ''.

   o  Publication of names on the homenet for general public use on the

   o  Publication of names on the homenet for use by authorized users of
      the homenet when connected to other networks.

   o  Secure delegation, enabling DNSSEC validation of names published
      on the homenet.

   A later document will describe additional functionality that can be
   implemented on more capable home network routers, so that a home
   network that has at least one such router, and one or more routers
   that only implement the architecture described in this document, can
   work together to provide the full feature set described in RFC 7368.

   In general, the set of capabilities required to discover services on
   any network are:

   o  A domain name that represents the network, under which names can
      be published and services advertised

   o  The ability to publish names that identify hosts and services.

   o  Advertising locally available services by publishing resource

   o  A service that can be queried for names and resources records in
      order to discover and use services.

   o  Advertisement of that service so that hosts can send queries to

   o  Timely removal of published names and resource records when they
      are no longer in use

   A simple homenet naming architecture adds the following

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   1.  Users cannot be assumed to be skilled or knowledgeable in name
       service operation, or even to have any sort of mental model of
       how these functions work.  All of the operations mentioned here
       must reliably function automatically, without any user
       intervention or debugging.

   2.  Because user intervention cannot be required, naming conflicts
       must be resolved automatically, and, to the extent possible,

   3.  Hosts are not required to implement any homenet-specific
       capabilities in order to discover and access services on the

   4.  Devices that provide services must be able to publish those
       services on the homenet, and those services must be available
       from any part of the homenet, not just the link to which the
       device is attached.

   5.  Homenet explicitly supports multihoming: connecting to more than
       one Internet Service Provider.  It therefore must address the
       problem of multiple provisioning domains [8], in the sense that
       the DNS may give a different answer depending on whether caching
       resolvers at one ISP or another are queried.

1.1.  Existing solutions

   Previous attempts to automate naming and service discovery in the
   context of a home network are able to function with varying degrees
   of success depending on the topology of the home network.
   Unfortunately, these solutions do not fully address the requirements
   of homenets.

   For example, Multicast DNS [5] can provide naming and service
   discovery [6], but only within a single multicast domain.

   The Domain Name System provides a hierarchical namespace [1], a
   mechanism for querying name servers to resolve names [2], a mechanism
   for updating namespaces by adding and removing names [4], and a
   mechanism for discovering services [6].  Unfortunately, DNS provides
   no mechanism for automatically provisioning new namespaces, and
   secure updates to namespaces require that the host submitting the
   update have a public or symmetric key that is known to the network
   and authorized for updates.  In an unmanaged network, the publication
   of and authorization of these keys is an unsolved problem.

   Some managed networks get around this problem by having the DHCP
   server do DNS updates.  However, this doesn't really work, because

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   DHCP doesn't provide a mechanism for updating service discovery
   records: it only supports publishing A and AAAA records.

   This partially solves the trust problem: DHCP can validate that a
   device is at least connected to a network link that is actually part
   of the managed network.  This prevents an off-network attacker from
   registering a name, but provides no mechanism for actually validating
   the identity of the host registering the name.  For example, it would
   be easy for an attacker on the network to steal a registered name.

   Hybrid Multicast DNS [10] proposes a mechanism for extending
   multicast DNS beyond a single multicast domain.  However, in order to
   use this as a solution, some shortcomings need to be considered.
   Most obviously, it requires that every multicast domain have a
   separate name.  This then requires that the homenet generate names
   for every multicast domain.  These names would then be revealed to
   the end user.  But since they would be generated automatically and
   arbitrarily, they would likely cause confusion rather than clarity,
   and in degenerate cases requires that the end user have a mental
   model of the topology of the network in order to guess on which link
   a given service may appear.

   At present, the approach we intend to take with respect to
   disambiguation is that this will not be solved at a protocol level
   for devices that do not implement the registration protocol.

2.  Terminology

   This document uses the following terms and abbreviations:

   HNR  Homenet Router

   ISP  Internet Service Provider

3.  Name Resolution

3.1.  Configuring Resolvers

   Hosts on the homenet receive a set of resolver IP addresses using
   either DHCP or RA.  IPv4-only hosts will receive IPv4 addresses of
   resolvers, if available, over DHCP.  IPv6-only hosts will receive
   resolver IPv6 addresses using either stateful (if available) or
   stateless DHCPv6, or through the Recursive DNS Server Option ([9],
   Section 5.1) in router advertisements.

   All Homenet routers provide resolver information using both stateless
   DHCPv6 and RA; support for stateful DHCPv6 and DHCPv4 is optional,

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   however if either service is offered, resolver addresses will be
   provided using that mechanism as well.

3.2.  DNS Service Discovery Registration Protocol

   The DNSSD Service Registration protocol [12] requires that DNS
   updates be validated on the basis that they are received on the local
   link.  To ensure that such registrations are actually received on
   local links in the homenet, updates are sent to the local relay proxy
   ([11]) (XXX how?).

   The relay proxy encapsulates the update and sends it to whatever
   Discovery Proxy is listening on the link; the Discovery proxy then
   either consumes the update directly, or forwards it to the
   authoritative resolver for the local service discovery zone.  If the
   registration protocol is not supported on the homenet, the Discovery
   Proxy rejects the update with a ??? RCODE.

3.3.  Configuring Service Discovery

   Clients discovering services using DNS-SD [6] follow a two-step
   process.  The first step is for the client device to determine in
   which domain(s) to attempt to discover services.  The second step is
   for the client device to then seek desired service(s) in those
   domain(s).  For an example of the second step, given the desired
   service type "IPP Printing", and the domains "local" and
   "", the client device forms the queries
   "_ipp._tcp.local.  PTR ?" (resolved using Multicast DNS) and
   " PTR. ?" (resolved using Unicast DNS) and
   then presents the combined list of results to the user.

   The first step, determining in which domain(s) to attempt to discover
   services, is performed in a variety of ways, as described in
   Section 11 of the DNS-Based Service Discovery specification [6].

   The domain "local" is generally always in the set of domains in which
   the client devices attempt to discover services, and other domains
   for service discovery may be configured manually by the user.

   The device also learns additional domains automatically from its
   network environment.  For this automatic configuration discovery,
   special DNS queries are formulated.  To learn additional domain(s) in
   which to attempt to discover services, the query string
   "lb._dns_sd._udp" is prepended onto three different kinds of
   "bootstrap domain" to form DNS queries that allow the device to learn
   the configuration information.

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   One of these bootstrap domains is the fixed string "local".  The
   device issues the query "lb._dns_sd._udp.local.  PTR ?" (resolved
   using Multicast DNS), and if any answers are received, then they are
   added to the set of domains in which the client devices attempt to
   discover services.

   Another kind of these bootstrap domains is name-based, derived from
   the DHCPv4 "domain name" option (code 15) [3] (for IPv4) or the DNS
   Search List (DNSSL) Router Advertisement option [9] (for IPv6).  If a
   domain in the DNSSL is "", then the device issues the
   query "  PTR ?" (resolved using Unicast
   DNS), and if any answers are received, then they are likewise added
   to the set of domains in which the client devices attempt to discover

   Finally, the third kind of bootstrap domain is address-based, derived
   from the device's IP address(es) themselves.  If the device has IP
   address, then the device issues the query
   "  PTR ?" (resolved using
   Unicast DNS), and if any answers are received, then they are also
   added to the set of domains in which the client devices attempt to
   discover services.

   Since there is an HNR on every link of a homenet, automatic
   configuration could be performed by having HNRs answer the
   "lb._dns_sd._udp.local.  PTR ?" (Multicast DNS) queries.  However,
   because multicast is slow and unreliable on many modern network
   technologies like Wi-Fi, we prefer to avoid using it.  Instead we
   require that a homenet be configured to answer the name-based
   bootstrap queries.  By default the domain in the DNSSL communicated
   to the client devices will be "", and the homenet will be
   configured to correctly answer queries such as
   "  PTR ?", though client devices must not
   assume that the name will always be "".  A client could be
   configured with any valid DNSSL, and should construct the appropriate
   bootstrap queries derived from the name(s) in their configured DNS
   Search List.

   HNRs will answer domain enumeration queries against every IPv4
   address prefix advertised on a homenet link, and every IPv6 address
   prefix advertised on a homenet link, including prefixes derived from
   the homenet's ULA(s).  Whenever the "<domain>" sequence appears in
   this section, it references each of the domains mentioned in this

   Homenets advertise the availability of several browsing zones in the
   "b._dns_sd._udp.<domain>" subdomain.  By default, the ''
   domain is advertised.  Similarly, '' is advertised as the

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   default browsing and service registration domain under
   "db._dns_sd._udp.<domain>", "r._dns_sd._udp.<domain>",
   "dr._dns_sd._udp.<domain>" and "lb._dns_sd._udp.<domain>".

   In order for this discovery process to work, the homenet must provide
   authoritative answers for each of the domains that might be queried.
   To do this, it provides authoritative name service for the ''
   and '' subdomains corresponding to each of the prefixes
   advertised on the homenet.  For example, consider a homenet with the, 2001:db8:1234:5600::/56 and fc01:2345:6789:1000::/56
   prefixes.  This homenet will have to provide a name server that
   claims to be authoritative for, and

   An IPv6-only homenet would not have an authoritative server for a
   subdomain of  These public authoritative zones are
   required for the public prefixes even if the prefixes are not
   delegated.  However, they need not be accessible outside of the

   It is out of the scope of this document to specify ISP behavior, but
   we note that ISPs have the option of securely delegating the zone, or
   providing an unsigned delegation, or providing no delegation.  Any
   delegation tree that does not include an unsigned delegation at or
   above the zone cut for the reverse zone for the assigned
   prefix will fail to validate.

   Ideally, an ISP should provide a secure delegation using a zone-
   signing key provided by the homenet.  However, that too is out of
   scope for this document.  Therefore, an ISP that wishes to support
   users of the simple homenet naming architecture will have to provide
   an unsigned delegation.  We do not wish, however, to discourage
   provisioning of signed delegations when that is possible.

3.4.  Resolution of local names

   By default, Local names appear as subdomains of ''.  These
   names can only be resolved within the homenet; not only is
   '' not a globally unique name, but queries from outside of
   the homenet for any name, on or off the homenet, must be rejected
   with a REFUSED response.  The intended use case for local names is
   that hosts will attempt to discover or contact other hosts on the
   homenet that are offering services.

   In addition, names of devices on the homenet can appear in the
   resource records of names that are subdomains of the locally-served
   '' or ' zone that corresponding to the RFC1918

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   IPv4 prefix and the IPv6 ULA that is in use on the homenet.  Names
   ending in '' should never appear in RRDATA for names that
   are subdomains of reverse mappings for global IP addresses.  This
   should not cause operational problems, since connections between
   devices on the homenet can be expected to use addresses in the
   homenet's ULA prefix.

   ISP-provided addresses cannot be assumed to be stable.  Not only is
   it possible that the ISP policy is to change addresses over time, but
   the connection to the ISP may not always be available.  The homenet's
   ULA prefix and RFC1918 prefix, however, can be assumed to be stable.
   Therefore, IP addresses and names advertised locally MUST use
   addresses in the homenet's ULA prefix and/or RFC1918 prefix.

   It is possible that local services may offer services available on IP
   addresses in public as well as ULA prefixes.  Homenet hybrid proxies
   MUST filter out global IP addresses, providing only ULA addresses,
   similar to the process described in section 5.5.2 of [10].

   This filtering applies to queries within the homenet; it is
   appropriate for non-ULA addresses to be used for offering services,
   because in some cases end users may want such services to be
   reachable outside of the homenet.  Configuring this is however out of
   scope for this document.

   The Hybrid Proxy model relies on each link having its own name.
   However, homenets do not actually have a way to name local links that
   will make any sense to the end user.  Consequently, this mechanism
   will not work without some tweaks.  In order to address this,
   homenets will use Discovery Brokers [16].  The discovery broker will
   be configured so that a single query for a particular service will be
   successful in providing the information required to access that
   service, regardless of the link it is on.

   Artificial link names will be generated using HNCP.  These should
   only be visible to the user in graphical user interfaces in the event
   that the same name is claimed by a service on two links.  Services
   that are expected to be accessed by users who type in names should
   use [12] if it is available.

   Homenets are not required to support Service Registration.  Service
   registration requires a stateful authoritative DNS server; this may
   be beyond the capability of the minimal Homenet router.  However,
   more capable Homenet routers should provide this capability.  In
   order to make this work, minimal Homenet routers MUST implement the
   split hybrid proxy [11].  This enables a Homenet with one or more
   Homenet routers that provide a stateful registration cache to allow
   those routers to take over service, using Discovery Relays to service

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   links that are connected using Homenet routers with more limited

3.5.  Globally Unique Name

   Automatic configuration of a globally unique name for the homenet is
   out of scope for this document.  However, homenet servers MUST allow
   the user to configure a globally unique name in place of the default
   name, ''  By default, even if configured with a global
   name, homenet routers MUST NOT answer queries from outside of the
   homenet for subdomains of that name.

3.6.  DNSSEC Validation

   DNSSEC Validation for the '' zone and for the locally-served
   ' and '' domains is not possible without a trust
   anchor.  Establishment of a trust anchor for such validation is out
   of scope for this document.

   Homenets that have been configured with a globally unique domain MUST
   support DNSSEC signing of local names, and must provide a way to
   generate a KSK that can be used in the secure delegation of the
   globally unique domain assigned to the homenet.

3.7.  Support for Multiple Provisioning Domains

   Homenets must support the Multiple Provisioning Domain Architecture
   [8].  Hosts connected to the homenet may or may not support multiple
   provisioning domains.  For hosts that do not support multiple
   provisioning domains, the homenet provides one or more resolvers that
   will answer queries for any provisioning domain.  Such hosts may
   receive answers to queries that either do not work as well if the
   host chooses a source address from a different provisioning domain,
   or does not work at all.  However, the default source address
   selection policy, longest-match [CITE], will result in the correct
   source address being chosen as long as the destination address has a
   close match to the prefix assigned by the ISP.

   Hosts that support multiple provisioning domains will be provisioned
   with one or more resolvers per provisioning domain.  Such hosts can
   use the IP address of the resolver to determine which provisioning
   domain is applicable for a particular answer.

   Each ISP has its own provisioning domain.  Because ISPs connections
   cannot be assumed to be persistent, the homenet has its own separate
   provisioning domain.

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   Configuration from the IPv4 DHCP server are treated as being part of
   the homenet provisioning domain.  The case where a homenet advertises
   IPv4 addresses from one or more public prefixes is out of scope for
   this document.  Such a configuration is NOT RECOMMENDED for homenets.

   Configuration for IPv6 provisioning domains is done using the
   Multiple Provisioning Domain RA option [CITE].

3.8.  Using the Local Namespace While Away From Home

   This architecture does not provide a way for service discovery to be
   performed on the homenet by devices that are not directly connected
   to a link that is part of the homenet.

4.  Management Considerations

   This architecture is intended to be self-healing, and should not
   require management.  That said, a great deal of debugging and
   management can be done simply using the DNS Service Discovery

5.  Privacy Considerations

   Privacy is somewhat protected in the sense that names published on
   the homenet are only visible to devices connected to the homenet.
   This may be insufficient privacy in some cases.

   The privacy of host information on the homenet is left to hosts.
   Various mechanisms are available to hosts to ensure that tracking
   does not occur if it is not desired.  However, devices that need to
   have special permission to manage the homenet will inevitably reveal
   something about themselves when doing so.  It may be possible to use
   something like HTTP token binding [14] to mitigate this risk.

6.  Security Considerations

   There are some clear issues with the security model described in this
   document, which will be documented in a future version of this
   section.  A full analysis of the avenues of attack for the security
   model presented here have not yet been done, and must be done before
   the document is published.

7.  IANA considerations

   No new actions are required by IANA for this document.

   Note however that this document is relying on the allocation of
   '' described in Special Use Top Level Domain ''

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   [15].  This document therefore can't proceed until that allocation is

8.  Normative References

   [1]        Mockapetris, P., "Domain names - concepts and facilities",
              STD 13, RFC 1034, DOI 10.17487/RFC1034, November 1987,

   [2]        Mockapetris, P., "Domain names - implementation and
              specification", STD 13, RFC 1035, DOI 10.17487/RFC1035,
              November 1987, <>.

   [3]        Alexander, S. and R. Droms, "DHCP Options and BOOTP Vendor
              Extensions", RFC 2132, DOI 10.17487/RFC2132, March 1997,

   [4]        Vixie, P., Ed., Thomson, S., Rekhter, Y., and J. Bound,
              "Dynamic Updates in the Domain Name System (DNS UPDATE)",
              RFC 2136, DOI 10.17487/RFC2136, April 1997,

   [5]        Cheshire, S. and M. Krochmal, "Multicast DNS", RFC 6762,
              DOI 10.17487/RFC6762, February 2013,

   [6]        Cheshire, S. and M. Krochmal, "DNS-Based Service
              Discovery", RFC 6763, DOI 10.17487/RFC6763, February 2013,

   [7]        Chown, T., Ed., Arkko, J., Brandt, A., Troan, O., and J.
              Weil, "IPv6 Home Networking Architecture Principles",
              RFC 7368, DOI 10.17487/RFC7368, October 2014,

   [8]        Anipko, D., Ed., "Multiple Provisioning Domain
              Architecture", RFC 7556, DOI 10.17487/RFC7556, June 2015,

   [9]        Jeong, J., Park, S., Beloeil, L., and S. Madanapalli,
              "IPv6 Router Advertisement Options for DNS Configuration",
              RFC 8106, DOI 10.17487/RFC8106, March 2017,

   [10]       Cheshire, S., "Discovery Proxy for Multicast DNS-Based
              Service Discovery", draft-ietf-dnssd-hybrid-07 (work in
              progress), September 2017.

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   [11]       Cheshire, S. and T. Lemon, "Multicast DNS Discovery
              Relay", draft-sctl-dnssd-mdns-relay-01 (work in progress),
              October 2017.

   [12]       Cheshire, S. and T. Lemon, "Service Registration Protocol
              for DNS-Based Service Discovery", draft-sctl-service-
              registration-00 (work in progress), July 2017.

   [13]       Korhonen, J., Krishnan, S., and S. Gundavelli, "Support
              for multiple provisioning domains in IPv6 Neighbor
              Discovery Protocol", draft-ietf-mif-mpvd-ndp-support-03
              (work in progress), February 2016.

   [14]       Popov, A., Nystrom, M., Balfanz, D., Langley, A., Harper,
              N., and J. Hodges, "Token Binding over HTTP", draft-ietf-
              tokbind-https-10 (work in progress), July 2017.

   [15]       Pfister, P. and T. Lemon, "Special Use Domain
              ''", draft-ietf-homenet-dot-14 (work in
              progress), September 2017.

   [16]       Cheshire, S. and T. Lemon, "Service Discovery Broker",
              draft-sctl-discovery-broker-00 (work in progress), July

Authors' Addresses

   Ted Lemon
   Barefoot Consulting
   Brattleboro, Vermont  05301
   United States of America


   Daniel Migault
   8400 boulevard Decarie
   Montreal, QC H4P 2N2


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Internet-Draft        Simple Homenet Naming/SD Arch         October 2017

   Stuart Cheshire
   Apple Inc.
   1 Infinite Loop
   Cupertino, California  95014

   Phone: +1 408 974 3207

Lemon, et al.              Expires May 3, 2018                 [Page 14]