IPv6 Unicast Address Assignment Considerations
RFC 5375
| Document | Type | RFC - Informational (December 2008; Errata) | |
|---|---|---|---|
| Authors | Chip Popoviciu , Christian Hahn , Olaf Bonness , Gunter Van de Velde , Tim Chown | ||
| Last updated | 2020-01-21 | ||
| Replaces | draft-vandevelde-v6ops-addcon | ||
| Stream | Internent Engineering Task Force (IETF) | ||
| Formats | plain text html pdf htmlized (tools) htmlized with errata bibtex | ||
| Reviews | |||
| Stream | WG state | (None) | |
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | RFC 5375 (Informational) | |
| Action Holders |
(None)
|
||
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Ron Bonica | ||
| Send notices to | (None) | ||
Network Working Group G. Van de Velde
Request for Comments: 5375 C. Popoviciu
Category: Informational Cisco Systems
T. Chown
University of Southampton
O. Bonness
C. Hahn
T-Systems Enterprise Services GmbH
December 2008
IPv6 Unicast Address Assignment Considerations
Status of This Memo
This memo provides information for the Internet community. It does
not specify an Internet standard of any kind. Distribution of this
memo is unlimited.
Copyright Notice
Copyright (c) 2008 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.
Abstract
One fundamental aspect of any IP communications infrastructure is its
addressing plan. With its new address architecture and allocation
policies, the introduction of IPv6 into a network means that network
designers and operators need to reconsider their existing approaches
to network addressing. Lack of guidelines on handling this aspect of
network design could slow down the deployment and integration of
IPv6. This document aims to provide the information and
recommendations relevant to planning the addressing aspects of IPv6
deployments. The document also provides IPv6 addressing case studies
for both an enterprise and an ISP network.
Van de Velde, et al. Informational [Page 1]
RFC 5375 IPv6 Addressing Considerations December 2008
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Network-Level Addressing Design Considerations . . . . . . . . 4
2.1. Globally Unique Addresses . . . . . . . . . . . . . . . . 4
2.2. Unique Local IPv6 Addresses . . . . . . . . . . . . . . . 5
2.3. 6bone Address Space . . . . . . . . . . . . . . . . . . . 6
2.4. Network-Level Design Considerations . . . . . . . . . . . 6
2.4.1. Sizing the Network Allocation . . . . . . . . . . . . 8
2.4.2. Address Space Conservation . . . . . . . . . . . . . . 8
3. Subnet Prefix Considerations . . . . . . . . . . . . . . . . . 8
3.1. Considerations for /64 Prefixes . . . . . . . . . . . . . 10
4. Allocation of the IID of an IPv6 Address . . . . . . . . . . . 10
4.1. Automatic EUI-64 Format Option . . . . . . . . . . . . . . 10
4.2. Using Privacy Extensions . . . . . . . . . . . . . . . . . 10
4.3. Manual/Dynamic Assignment Option . . . . . . . . . . . . . 11
5. Security Considerations . . . . . . . . . . . . . . . . . . . 11
6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 11
7. Informative References . . . . . . . . . . . . . . . . . . . . 12
Appendix A. Case Studies . . . . . . . . . . . . . . . . . . . . 16
A.1. Enterprise Considerations . . . . . . . . . . . . . . . . 16
A.1.1. Obtaining General IPv6 Network Prefixes . . . . . . . 16
A.1.2. Forming an Address (Subnet) Allocation Plan . . . . . 17
A.1.3. Other Considerations . . . . . . . . . . . . . . . . . 18
A.1.4. Node Configuration Considerations . . . . . . . . . . 18
A.2. Service Provider Considerations . . . . . . . . . . . . . 19
A.2.1. Investigation of Objective Requirements for an
IPv6 Addressing Schema of a Service Provider . . . . . 19
A.2.2. Exemplary IPv6 Address Allocation Plan for a
Service Provider . . . . . . . . . . . . . . . . . . . 23
A.2.3. Additional Remarks . . . . . . . . . . . . . . . . . . 28
Appendix B. Considerations for Subnet Prefixes Different than
/64 . . . . . . . . . . . . . . . . . . . . . . . . . 30
B.1. Considerations for Subnet Prefixes Shorter than /64 . . . 30
B.2. Considerations for Subnet Prefixes Longer than /64 . . . . 31
B.2.1. /126 Addresses . . . . . . . . . . . . . . . . . . . . 31
B.2.2. /127 Addresses . . . . . . . . . . . . . . . . . . . . 31
B.2.3. /128 Addresses . . . . . . . . . . . . . . . . . . . . 31
B.2.4. EUI-64 'u' and 'g' Bits . . . . . . . . . . . . . . . 31
B.2.5. Anycast Addresses . . . . . . . . . . . . . . . . . . 32
B.2.6. Addresses Used by Embedded-RP (RFC 3956) . . . . . . . 33
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