Recommendations of Using Unique Local Addresses
draft-ietf-v6ops-ula-usage-recommendations-02

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Document Type Active Internet-Draft (v6ops WG)
Last updated 2014-02-14
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: August 18, 2014                               February 14, 2014

              Recommendations of Using Unique Local Addresses
             draft-ietf-v6ops-ula-usage-recommendations-02.txt

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Liu, et al.            Expires August 18, 2014                [Page 1]
Internet-Draft      Recommendations of Using ULAs        February 2014

Abstract

   This document provides guidance of how to use ULAs. It analyzes ULA
   usage scenarios and recommends use cases where ULA addresses might 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 Scenarios Using ULAs .......................... 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 ................................. 7
      3.3. IPv4 Co-existence consideration ......................... 9
   4. General Guidelines of using ULA .............................. 9
      4.1. Do not treat ULA equal to RFC1918 ....................... 9
      4.2. Using ULAs in a limited scope .......................... 10
   5. ULA usage recommendations ................................... 10
      5.1. Used in Isolated Networks .............................. 10
      5.2. ULA along with GUA ..................................... 10
      5.3. Recommended Specific Use Cases ......................... 10
         5.3.1. Special routing ................................... 11
         5.3.2. Used as NAT64 prefix .............................. 11
         5.3.3. Used as identifier ................................ 12
   6. Security Considerations ..................................... 12
   7. IANA Considerations ......................................... 13
   8. Conclusions ................................................. 13
   9. References .................................................. 13
      9.1. Normative References ................................... 13
      9.2. Informative References ................................. 13
   10. Acknowledgments ............................................ 14

Liu, et al.            Expires August 18, 2014                [Page 2]
Internet-Draft      Recommendations of Using ULAs        February 2014

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
   widely deployed yet. The use of ULA addresses in various types of
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