Recommendations of Using Unique Local Addresses
draft-ietf-v6ops-ula-usage-recommendations-00

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Document Type Active Internet-Draft (v6ops WG)
Last updated 2013-05-17
Replaces draft-liu-v6ops-ula-usage-analysis
Replaced by draft-ietf-v6ops-ula-usage-considerations
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Network Working Group                                            B. Liu
Internet Draft                                                 S. Jiang
Intended status: Informational                      Huawei Technologies
Expires: November 17, 2013                                     C. Byrne
                                                           T-Mobile USA
                                                           May 16, 2013

              Recommendations of Using Unique Local Addresses
             draft-ietf-v6ops-ula-usage-recommendations-00.txt

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   This Internet-Draft will expire on November 17, 2013.

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Liu, et al.           Expires November 17, 2013               [Page 1]
Internet-Draft  draft-ietf-v6ops-ula-usage-recommendations-00  May 2013

Abstract

   This document provides guidance of how to use ULA. It analyzes ULA
   usage scenarios and recommends use cases where ULA address may be
   beneficially used.

Table of Contents

   1. Introduction ................................................. 3
   2. The analysis of ULA features ................................. 3
      2.1. Automatically Generated ................................. 3
      2.2. Globally unique.......................................... 3
      2.3. Independent address space ............................... 4
      2.4. Well known prefix ....................................... 4
      2.5. Stable or Temporary Prefix .............................. 4
   3. Enumeration of ULA use scenarios ............................. 4
      3.1. Isolated network ........................................ 4
      3.2. Connected network ....................................... 5
         3.2.1. ULA-only Deployment ................................ 5
         3.2.2. ULA along with GUA ................................. 6
   4. General Guidelines of using ULA .............................. 6
      4.1. Do not treat ULA equal to RFC1918 ....................... 6
      4.2. Using ULAs in a limited scope ........................... 7
   5. ULA usage recommendations .................................... 7
      5.1. Used in Isolated Networks ............................... 7
      5.2. ULA along with GUA ...................................... 7
      5.3. Special Use Cases ....................................... 8
         5.3.1. Special routing .................................... 8
         5.3.2. Used as NAT64 prefix ............................... 8
         5.3.3. Used as identifier ................................. 9
   6. Security Considerations ...................................... 9
   7. IANA Considerations ......................................... 10
   8. Conclusions ................................................. 10
   9. References .................................................. 10
      9.1. Normative References ................................... 10
      9.2. Informative References ................................. 10
   10. Acknowledgments ............................................ 11

Liu, et al.           Expires November 17, 2013               [Page 2]
Internet-Draft  draft-ietf-v6ops-ula-usage-recommendations-00  May 2013

1. Introduction

   Unique Local Addresses (ULAs) are defined in [RFC4193] as provider-
   independent prefixes that can be used on isolated networks, internal
   networks, and VPNs. Although ULAs may be treated like global scope by
   applications, normally they should not be used on the publicly
   routable internet.

   However, the ULAs haven't been widely used since IPv6 hasn't been
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