Diameter Network Address and Port Translation Control Application
RFC 6736

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Internet Engineering Task Force (IETF)                      F. Brockners
Request for Comments: 6736                                   S. Bhandari
Category: Standards Track                                          Cisco
ISSN: 2070-1721                                                 V. Singh

                                                              V. Fajardo
                                                  Telcordia Technologies
                                                            October 2012

   Diameter Network Address and Port Translation Control Application

Abstract

   This document describes the framework, messages, and procedures for
   the Diameter Network address and port translation Control
   Application.  This Diameter application allows per-endpoint control
   of Network Address Translators and Network Address and Port
   Translators, which are added to networks to cope with IPv4 address
   space depletion.  This Diameter application allows external devices
   to configure and manage a Network Address Translator device --
   expanding the existing Diameter-based Authentication, Authorization,
   and Accounting (AAA) and policy control capabilities with a Network
   Address Translator and Network Address and Port Translator control
   component.  These external devices can be network elements in the
   data plane such as a Network Access Server, or can be more
   centralized control plane devices such as AAA-servers.  This Diameter
   application establishes a context to commonly identify and manage
   endpoints on a gateway or server and a Network Address Translator and
   Network Address and Port Translator device.  This includes, for
   example, the control of the total number of Network Address
   Translator bindings allowed or the allocation of a specific Network
   Address Translator binding for a particular endpoint.  In addition,
   it allows Network Address Translator devices to provide information
   relevant to accounting purposes.

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/rfc6736.

Brockners, et al.            Standards Track                    [Page 1]
RFC 6736            Diameter NAT Control Application        October 2012

Copyright Notice

   Copyright (c) 2012 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 ....................................................4
   2. Conventions .....................................................6
   3. Deployment Framework ............................................7
      3.1. Deployment Scenario ........................................7
      3.2. Diameter NAPT Control Application Overview .................9
      3.3. Deployment Scenarios for DNCA .............................10
   4. DNCA Session Establishment and Management ......................12
      4.1. Session Establishment .....................................13
      4.2. Session Update ............................................16
      4.3. Session and Binding Query .................................18
      4.4. Session Termination .......................................20
      4.5. Session Abort .............................................21
      4.6. Failure Cases of the DNCA Diameter Peers ..................22
   5. Use of the Diameter Base Protocol ..............................23
      5.1. Securing Diameter Messages ................................23
      5.2. Accounting Functionality ..................................24
      5.3. Use of Sessions ...........................................24
      5.4. Routing Considerations ....................................24
      5.5. Advertising Application Support ...........................24
   6. DNCA Commands ..................................................25
      6.1. NAT-Control-Request (NCR) Command .........................25
      6.2. NAT-Control-Answer (NCA) Command ..........................26