Dynamic Allocation of Shared IPv4 Addresses
RFC 7618

Document Type RFC - Proposed Standard (August 2015; No errata)
Last updated 2015-10-14
Replaces draft-csf-dhc-dynamic-shared-v4allocation
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd Bernie Volz
Shepherd write-up Show (last changed 2015-02-20)
IESG IESG state RFC 7618 (Proposed Standard)
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Internet Engineering Task Force (IETF)                            Y. Cui
Request for Comments: 7618                                        Q. Sun
Category: Standards Track                            Tsinghua University
ISSN: 2070-1721                                                I. Farrer
                                                     Deutsche Telekom AG
                                                                  Y. Lee
                                                                 Comcast
                                                                  Q. Sun
                                                           China Telecom
                                                            M. Boucadair
                                                          France Telecom
                                                             August 2015

              Dynamic Allocation of Shared IPv4 Addresses

Abstract

   This memo describes the dynamic allocation of shared IPv4 addresses
   to clients using DHCPv4.  Address sharing allows a single IPv4
   address to be allocated to multiple active clients simultaneously,
   with each client being differentiated by a unique set of transport-
   layer source port numbers.  The necessary changes to existing DHCPv4
   client and server behavior are described, and a new DHCPv4 option for
   provisioning clients with shared IPv4 addresses is included.

   Due to the nature of IP address sharing, some limitations to its
   applicability are necessary.  This memo describes these limitations
   and recommends suitable architectures and technologies where address
   sharing may be utilized.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7618.

Cui, et al.                  Standards Track                    [Page 1]
RFC 7618             Dynamic Shared IPv4 Allocation          August 2015

Copyright Notice

   Copyright (c) 2015 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.

Table of Contents

   1. Introduction ....................................................3
   2. Applicability Statement .........................................3
   3. Requirements Language ...........................................4
   4. Terminology .....................................................4
   5. Functional Overview .............................................4
   6. Client-Server Interaction .......................................5
   7. Client Behavior .................................................6
      7.1. Restrictions to Client Usage of a Shared IPv4 Address ......7
   8. Server Behavior .................................................7
      8.1. Leasing Shared and Non-Shared IPv4 Addresses from a
           Single DHCP 4o6 Server .....................................9
   9. DHCPv4 Port Parameters Option ...................................9
   10. Security Considerations .......................................10
      10.1. Port Randomization .......................................11
   11. IANA Considerations ...........................................11
   12. References ....................................................11
      12.1. Normative References .....................................11
      12.2. Informative References ...................................12
   Acknowledgements ..................................................14
   Authors' Addresses ................................................14

Cui, et al.                  Standards Track                    [Page 2]
RFC 7618             Dynamic Shared IPv4 Allocation          August 2015

1.  Introduction

   The shortage of available public IPv4 addresses means that it is not
   always possible for operators to allocate a full IPv4 address to
   every connected device.  This problem is particularly acute while an
   operator is migrating from their existing, native IPv4 network to a
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