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The Host Identity Protocol (HIP) Experiment Report
RFC 6538

Internet Research Task Force (IRTF)                         T. Henderson
Request for Comments: 6538                            The Boeing Company
Category: Informational                                        A. Gurtov
ISSN: 2070-1721                                       University of Oulu
                                                              March 2012

           The Host Identity Protocol (HIP) Experiment Report

Abstract

   This document is a report from the IRTF Host Identity Protocol (HIP)
   research group documenting the collective experiences and lessons
   learned from studies, related experimentation, and designs completed
   by the research group.  The document summarizes implications of
   adding HIP to host protocol stacks, Internet infrastructure, and
   applications.  The perspective of a network operator, as well as a
   list of HIP experiments, are presented as well.  Portions of this
   report may be relevant also to other network overlay-based
   architectures or to attempts to deploy alternative networking
   architectures.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This document is a product of the Internet Research Task Force
   (IRTF).  The IRTF publishes the results of Internet-related research
   and development activities.  These results might not be suitable for
   deployment.  This RFC represents the consensus of the IRTF HIP
   Research Group of the Internet Research Task Force (IRTF).  Documents
   approved for publication by the IRSG are not 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/rfc6538.

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

Henderson & Gurtov            Informational                     [Page 1]
RFC 6538                  HIP Experiment Report               March 2012

   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.

Table of Contents

   1. Introduction ....................................................3
      1.1. What is HIP? ...............................................3
      1.2. Terminology ................................................4
      1.3. Scope ......................................................4
      1.4. Organization ...............................................5
   2. Host Stack Implications .........................................6
      2.1. Modifications to TCP/IP Stack Implementations ..............6
           2.1.1. ESP Implementation Extensions .......................8
      2.2. User-Space Implementations .................................9
      2.3. Issues Common to Both Implementation Approaches ............9
           2.3.1. User-Space Handling of HITs .........................9
           2.3.2. Opportunistic Mode .................................10
           2.3.3. Resolving HITs to Addresses ........................12
           2.3.4. IPsec Management API Extensions ....................12
           2.3.5. Transport Protocol Issues ..........................12
           2.3.6. Legacy NAT Traversal ...............................14
           2.3.7. Local Management of Host Identity Namespace ........14
           2.3.8. Interactions with Host Firewalls ...................15
      2.4. IPv4 versus IPv6 Issues ...................................15
      2.5. What Have Early Adopters Learned from Experience? .........16
   3. Infrastructure Implications ....................................17
      3.1. Impact on DNS .............................................17
      3.2. HIP-Aware Middleboxes .....................................17
      3.3. HIT Resolution Infrastructure .............................18
      3.4. Rendezvous Servers ........................................18
      3.5. Hybrid DNS-DHT Resolution .................................19
   4. Application Implications .......................................20
      4.1. Non-Intrusive HIP Insertion ...............................20
      4.2. Referrals .................................................20
      4.3. Latency ...................................................21
   5. Network Operator's Perspective .................................21
      5.1. Management of the Host Identity Namespace .................21
      5.2. Use of ESP Encryption .....................................22

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