Basic Host Identity Protocol (HIP) Extensions for Traversal of Network Address Translators
RFC 5770

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Internet Engineering Task Force (IETF)                           M. Komu
Request for Comments: 5770                                          HIIT
Category: Experimental                                      T. Henderson
ISSN: 2070-1721                                       The Boeing Company
                                                           H. Tschofenig
                                                  Nokia Siemens Networks
                                                                J. Melen
                                                         A. Keranen, Ed.
                                            Ericsson Research Nomadiclab
                                                              April 2010

           Basic Host Identity Protocol (HIP) Extensions for
                Traversal of Network Address Translators

Abstract

   This document specifies extensions to the Host Identity Protocol
   (HIP) to facilitate Network Address Translator (NAT) traversal.  The
   extensions are based on the use of the Interactive Connectivity
   Establishment (ICE) methodology to discover a working path between
   two end-hosts, and on standard techniques for encapsulating
   Encapsulating Security Payload (ESP) packets within the User Datagram
   Protocol (UDP).  This document also defines elements of a procedure
   for NAT traversal, including the optional use of a HIP relay server.
   With these extensions HIP is able to work in environments that have
   NATs and provides a generic NAT traversal solution to higher-layer
   networking applications.

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/rfc5770.

Komu, et al.                  Experimental                      [Page 1]
RFC 5770               Basic NAT Traversal for HIP            April 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
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   include Simplified BSD License text as described in Section 4.e of
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   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.

Komu, et al.                  Experimental                      [Page 2]
RFC 5770               Basic NAT Traversal for HIP            April 2010

Table of Contents

   1. Introduction ....................................................4
   2. Terminology .....................................................6
   3. Overview of Operation ...........................................7
   4. Protocol Description ............................................8
      4.1. Relay Registration .........................................8
      4.2. ICE Candidate Gathering ...................................10
      4.3. NAT Traversal Mode Negotiation ............................10
      4.4. Connectivity Check Pacing Negotiation .....................12
      4.5. Base Exchange via HIP Relay Server ........................12
      4.6. ICE Connectivity Checks ...................................15
      4.7. NAT Keepalives ............................................16
      4.8. Base Exchange without ICE Connectivity Checks .............16