Analysis and recommendation for the ULA usage
draft-liu-v6ops-ula-usage-analysis-00

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Last updated 2011-10-21
Replaced by draft-ietf-v6ops-ula-usage-recommendations
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Network Working Group                                             B. Liu
Internet Draft                                                  S. Jiang
Intended status: Best Current Practice      Huawei Technologies Co., Ltd
Expires: April 2012                                     October 22, 2011

               Analysis and recommendation for the ULA usage
                 draft-liu-v6ops-ula-usage-analysis-00.txt

Status of this Memo

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   This Internet-Draft will expire on May 10, 2012.

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Abstract

   This document tries to cover all kinds of ULA use cases. And then
   tries to identify some potentially valuable use cases which can
   benefit from ULA.

                       Expires April 22, 2012                 [Page 1]
Liu & Jiang

Internet-Draft      draft-liu-v6ops-ula-analysis          October 2011

Table of Contents

   1. Introduction ................................................. 2
   2. The features of ULA .......................................... 2
      2.1. Globally unique ......................................... 2
      2.2. Independent address space ............................... 3
      2.3. Well known prefix ....................................... 3
   3. ULA usage analysis ........................................... 3
      3.1. ULA as address .......................................... 3
         3.1.1. ULA-only deployment ................................ 3
         3.1.2. ULA co-exist with globally routable addresses ...... 4
      3.2. ULA as identifier ....................................... 5
      3.3. Centrally assigned ULAs ................................. 6
   4. Benefit to renumbering ....................................... 6
   5. Benefit to security/privacy .................................. 6
   6. Security Considerations ...................................... 6
   7. IANA Considerations .......................................... 6
   8. Conclusions .................................................. 7
   9. References ................................................... 7
      9.1. Normative References .................................... 7
      9.2. Informative References .................................. 7
   10. Acknowledgments ............................................. 8

1. Introduction

   Unique Local Addresses (ULAs) are defined in RFC 4193 [RFC4193],
   which defines a local assignment method to be used for local,
   provider-independent prefixes that can be used on isolated networks,
   internal networks and VPNs.

   This document tries to cover all kinds of use cases regardless of
   whether they are valid or not. And then tries to identify some
   potentially valuable use cases.

   Particularly, this document intends to call for any existing practice
   of deploying ULA to be discussed in this document.

2. The features of ULA

2.1. Globally unique

   ULA is intended to be globally unique to avoid collision. Since the
   hosts assigned with ULA may occasionally be merged into one network.

   However, it still has some probability to have collision although the
   probability is very small.

Liu & Jiang            Expires April 22, 2012                 [Page 2]
Internet-Draft      draft-liu-v6ops-ula-analysis          October 2011

   Notice that, as described in [RFC4864], in practice, applications may
   treat ULAs like global-scope addresses, but address selection
   algorithms may need to distinguish between ULAs and ordinary global-
   scope unicast addresses to ensure stability.

2.2. Independent address space
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