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NAT/Firewall NSIS Signaling Layer Protocol (NSLP)
RFC 5973

Internet Engineering Task Force (IETF)                    M. Stiemerling
Request for Comments: 5973                                           NEC
Category: Experimental                                     H. Tschofenig
ISSN: 2070-1721                                   Nokia Siemens Networks
                                                                 C. Aoun
                                                              Consultant
                                                               E. Davies
                                                        Folly Consulting
                                                            October 2010

           NAT/Firewall NSIS Signaling Layer Protocol (NSLP)

Abstract

   This memo defines the NSIS Signaling Layer Protocol (NSLP) for
   Network Address Translators (NATs) and firewalls.  This NSLP allows
   hosts to signal on the data path for NATs and firewalls to be
   configured according to the needs of the application data flows.  For
   instance, it enables hosts behind NATs to obtain a publicly reachable
   address and hosts behind firewalls to receive data traffic.  The
   overall architecture is given by the framework and requirements
   defined by the Next Steps in Signaling (NSIS) working group.  The
   network scenarios, the protocol itself, and examples for path-coupled
   signaling are given in this memo.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for examination, experimental implementation, and
   evaluation.

   This document defines an Experimental Protocol for the Internet
   community.  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).  Not
   all documents approved by the IESG are a candidate for any level of
   Internet Standard; see 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/rfc5973.

Stiemerling, et al.           Experimental                      [Page 1]
RFC 5973                    NAT/FW NSIS NSLP                October 2010

Copyright Notice

   Copyright (c) 2010 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.

Stiemerling, et al.           Experimental                      [Page 2]
RFC 5973                    NAT/FW NSIS NSLP                October 2010

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  5
     1.1.  Scope and Background . . . . . . . . . . . . . . . . . . .  5
     1.2.  Terminology and Abbreviations  . . . . . . . . . . . . . .  8
     1.3.  Notes on the Experimental Status . . . . . . . . . . . . . 10
     1.4.  Middleboxes  . . . . . . . . . . . . . . . . . . . . . . . 10
     1.5.  General Scenario for NATFW Traversal . . . . . . . . . . . 11
   2.  Network Deployment Scenarios Using the NATFW NSLP  . . . . . . 13
     2.1.  Firewall Traversal . . . . . . . . . . . . . . . . . . . . 13
     2.2.  NAT with Two Private Networks  . . . . . . . . . . . . . . 14
     2.3.  NAT with Private Network on Sender Side  . . . . . . . . . 15
     2.4.  NAT with Private Network on Receiver Side Scenario . . . . 15
     2.5.  Both End Hosts behind Twice-NATs . . . . . . . . . . . . . 16

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