Considerations of Using Unique Local Addresses
draft-ietf-v6ops-ula-usage-recommendations-03

The information below is for an old version of the document
Document Type Active Internet-Draft (v6ops WG)
Last updated 2014-07-04
Replaces draft-liu-v6ops-ula-usage-analysis
Replaced by draft-ietf-v6ops-ula-usage-considerations
Stream IETF
Intended RFC status (None)
Formats plain text pdf html bibtex
Additional URLs
- Mailing list discussion
Stream WG state WG Document
Document shepherd None
IESG IESG state I-D Exists
Consensus Boilerplate Unknown
Telechat date
Responsible AD (None)
Send notices to (None)
Internet Engineering Task Force                                   B. Liu
Internet-Draft                                                  S. Jiang
Intended status: Informational                       Huawei Technologies
Expires: January 5, 2015                                    July 4, 2014

             Considerations of Using Unique Local Addresses
             draft-ietf-v6ops-ula-usage-recommendations-03

Abstract

   This document provides considerations of how to use ULAs.  It
   analyzes ULA usage scenarios and considers some use cases of ULA
   addresses as helpful.

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
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   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 January 5, 2015.

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.

Liu & Jiang              Expires January 5, 2015                [Page 1]
Internet-Draft        Considerations of Using ULAs             July 2014

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   3
   3.  Analysis of ULA Features  . . . . . . . . . . . . . . . . . .   3
     3.1.  Automatically Generated . . . . . . . . . . . . . . . . .   3
     3.2.  Globally Unique . . . . . . . . . . . . . . . . . . . . .   3
     3.3.  Independent Address Space . . . . . . . . . . . . . . . .   3
     3.4.  Well Known Prefix . . . . . . . . . . . . . . . . . . . .   4
     3.5.  Stable or Temporary Prefix  . . . . . . . . . . . . . . .   4
   4.  Enumeration of Scenarios Using ULAs . . . . . . . . . . . . .   4
     4.1.  Isolated Networks . . . . . . . . . . . . . . . . . . . .   4
     4.2.  Connected Network . . . . . . . . . . . . . . . . . . . .   6
       4.2.1.  ULA-Only Deployment . . . . . . . . . . . . . . . . .   6
       4.2.2.  ULAs along with PA Addresses  . . . . . . . . . . . .   7
     4.3.  IPv4 Co-existence Considerations  . . . . . . . . . . . .   9
   5.  General Guidelines of Using ULA . . . . . . . . . . . . . . .  10
     5.1.  Do Not Treat ULA Equal to RFC1918 . . . . . . . . . . . .  10
     5.2.  Using ULAs in a Limited Scope . . . . . . . . . . . . . .  10
   6.  ULA Usages Considered Helpful . . . . . . . . . . . . . . . .  11
     6.1.  Used in Isolated Networks . . . . . . . . . . . . . . . .  11
     6.2.  ULA along with PA . . . . . . . . . . . . . . . . . . . .  11
     6.3.  Some Specific Use Cases . . . . . . . . . . . . . . . . .  11
       6.3.1.  Special Routing . . . . . . . . . . . . . . . . . . .  11
       6.3.2.  Used as NAT64 Prefix  . . . . . . . . . . . . . . . .  11
       6.3.3.  Used as Identifier  . . . . . . . . . . . . . . . . .  12
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  13
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  13
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  13
     10.2.  Informative References . . . . . . . . . . . . . . . . .  14
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  16

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 .etc.  Although ULAs may be treated like global
   scope by applications, normally they should not be used on the
   publicly Internet.  Since site-local addresses are deprecated in
   [RFC3879], ULAs could be alternatives of site-local addresses in some
   situations (but they are not equal).

   However, the use of ULAs in various types of networks has been
   confusing to network operators.  This document aims to clarify the
Show full document text