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Location Information Server (LIS) Discovery Using IP Addresses and Reverse DNS
RFC 7216

Internet Engineering Task Force (IETF)                        M. Thomson
Request for Comments: 7216                                       Mozilla
Category: Standards Track                                      R. Bellis
ISSN: 2070-1721                                               Nominet UK
                                                              April 2014

              Location Information Server (LIS) Discovery
                   Using IP Addresses and Reverse DNS

Abstract

   The residential gateway is a device that has become an integral part
   of home networking equipment.  Discovering a Location Information
   Server (LIS) is a necessary part of acquiring location information
   for location-based services.  However, discovering a LIS when a
   residential gateway is present poses a configuration challenge,
   requiring a method that is able to work around the obstacle presented
   by the gateway.

   This document describes a solution to this problem.  The solution
   provides alternative domain names as input to the LIS discovery
   process based on the network addresses assigned to a Device.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7216.

Thomson & Bellis             Standards Track                    [Page 1]
RFC 7216                   LIS Discovery by IP                April 2014

Copyright Notice

   Copyright (c) 2014 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
   (http://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  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Conventions Used in This Document . . . . . . . . . . . . . .   4
   3.  Problem Statement . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Residential Gateway . . . . . . . . . . . . . . . . . . .   6
     3.2.  Security Features of Residential Gateways . . . . . . . .   7
   4.  IP-based DNS Solution . . . . . . . . . . . . . . . . . . . .   7
     4.1.  Identification of IP Addresses  . . . . . . . . . . . . .   8
     4.2.  Domain Name Selection . . . . . . . . . . . . . . . . . .   9
     4.3.  Shortened DNS Names . . . . . . . . . . . . . . . . . . .   9
     4.4.  When To Use the Reverse DNS Method  . . . . . . . . . . .  10
     4.5.  Private Address Spaces  . . . . . . . . . . . . . . . . .  10
     4.6.  Necessary Assumptions and Restrictions  . . . . . . . . .  11
     4.7.  Failure Modes . . . . . . . . . . . . . . . . . . . . . .  12
     4.8.  Deployment Considerations . . . . . . . . . . . . . . . .  12
   5.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .  13
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
   7.  IAB Considerations  . . . . . . . . . . . . . . . . . . . . .  15
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  16
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  16
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  16
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  16

Thomson & Bellis             Standards Track                    [Page 2]
RFC 7216                   LIS Discovery by IP                April 2014

1.  Introduction

   A Location Information Server (LIS) is a service provided by an
   access network.  The LIS uses knowledge of the access network
   topology and other information to generate location information for
   Devices.  Devices within an access network are able to acquire
   location information from a LIS.

   The relationship between a Device and an access network might be
   transient.  Configuration of the correct LIS at the Device ensures
   that accurate location information is available.  Without location

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