Updates to Network Address Translation (NAT) Behavioral Requirements
RFC 7857

Document Type RFC - Best Current Practice (April 2016; No errata)
Last updated 2018-12-20
Replaces draft-penno-behave-rfc4787-5382-5508-bis, draft-ietf-behave-requirements-update
Stream IETF
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Reviews
Stream WG state Submitted to IESG for Publication
Document shepherd David Black
Shepherd write-up Show (last changed 2016-01-27)
IESG IESG state RFC 7857 (Best Current Practice)
Consensus Boilerplate Yes
Telechat date
Responsible AD Spencer Dawkins
Send notices to "David L. Black" <david.black@emc.com>
IANA IANA review state Version Changed - Review Needed
IANA action state No IANA Actions
Internet Engineering Task Force (IETF)                          R. Penno
Request for Comments: 7857                                         Cisco
BCP: 127                                                    S. Perreault
Updates: 4787, 5382, 5508                            Jive Communications
Category: Best Current Practice                        M. Boucadair, Ed.
ISSN: 2070-1721                                                   Orange
                                                            S. Sivakumar
                                                                   Cisco
                                                                K. Naito
                                                                     NTT
                                                              April 2016

  Updates to Network Address Translation (NAT) Behavioral Requirements

Abstract

   This document clarifies and updates several requirements of RFCs
   4787, 5382, and 5508 based on operational and development experience.
   The focus of this document is Network Address Translation from IPv4
   to IPv4 (NAT44).

   This document updates RFCs 4787, 5382, and 5508.

Status of This Memo

   This memo documents an Internet Best Current Practice.

   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
   BCPs 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/rfc7857.

Penno, et al.             Best Current Practice                 [Page 1]
RFC 7857         Updates to NAT Behavioral Requirements       April 2016

Copyright Notice

   Copyright (c) 2016 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.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Penno, et al.             Best Current Practice                 [Page 2]
RFC 7857         Updates to NAT Behavioral Requirements       April 2016

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Scope . . . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  TCP Session Tracking  . . . . . . . . . . . . . . . . . . . .   4
     2.1.  TCP Transitory Connection Idle-Timeout  . . . . . . . . .   6
     2.2.  TCP RST . . . . . . . . . . . . . . . . . . . . . . . . .   6
   3.  Port Overlapping Behavior . . . . . . . . . . . . . . . . . .   6
   4.  Address Pooling Paired (APP)  . . . . . . . . . . . . . . . .   7
   5.  Endpoint-Independent Mapping (EIM) Protocol Independence  . .   8
   6.  Endpoint-Independent Filtering (EIF) Protocol Independence  .   8
   7.  Endpoint-Independent Filtering (EIF) Mapping Refresh  . . . .   8
     7.1.  Outbound Mapping Refresh and Error Packets  . . . . . . .   9
   8.  Port Parity . . . . . . . . . . . . . . . . . . . . . . . . .   9
   9.  Port Randomization  . . . . . . . . . . . . . . . . . . . . .   9
   10. IP Identification (IP ID) . . . . . . . . . . . . . . . . . .  10
   11. ICMP Query Mappings Timeout . . . . . . . . . . . . . . . . .  10
   12. Hairpinning Support for ICMP Packets  . . . . . . . . . . . .  10
   13. Security Considerations . . . . . . . . . . . . . . . . . . .  11
   14. References  . . . . . . . . . . . . . . . . . . . . . . . . .  12
     14.1.  Normative References . . . . . . . . . . . . . . . . . .  12
     14.2.  Informative References . . . . . . . . . . . . . . . . .  12
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