Native NAT Traversal Mode for the Host Identity Protocol
draft-ietf-hip-native-nat-traversal-31

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HIP Working Group                                             A. Keranen
Internet-Draft                                                  J. Melen
Intended status: Standards Track                            M. Komu, Ed.
Expires: October 25, 2020                                       Ericsson
                                                          April 23, 2020

        Native NAT Traversal Mode for the Host Identity Protocol
                 draft-ietf-hip-native-nat-traversal-31

Abstract

   This document specifies a new Network Address Translator (NAT)
   traversal mode for the Host Identity Protocol (HIP).  The new mode is
   based on the Interactive Connectivity Establishment (ICE) methodology
   and UDP encapsulation of data and signaling traffic.  The main
   difference from the previously specified modes is the use of HIP
   messages instead of ICE for all NAT traversal procedures due to the
   kernel-space dependencies of HIP.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on October 25, 2020.

Copyright Notice

   Copyright (c) 2020 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
   (https://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

Keranen, et al.         Expires October 25, 2020                [Page 1]
Internet-Draft        HIP Native NAT Traversal Mode           April 2020

   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  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Overview of Operation . . . . . . . . . . . . . . . . . . . .   8
   4.  Protocol Description  . . . . . . . . . . . . . . . . . . . .  10
     4.1.  Relay Registration  . . . . . . . . . . . . . . . . . . .  10
     4.2.  Transport Address Candidate Gathering at the Relay Client  13
     4.3.  NAT Traversal Mode Negotiation  . . . . . . . . . . . . .  15
     4.4.  Connectivity Check Pacing Negotiation . . . . . . . . . .  17
     4.5.  Base Exchange via Control Relay Server  . . . . . . . . .  17
     4.6.  Connectivity Checks . . . . . . . . . . . . . . . . . . .  20
       4.6.1.  Connectivity Check Procedure  . . . . . . . . . . . .  21
       4.6.2.  Rules for Connectivity Checks . . . . . . . . . . . .  24
       4.6.3.  Rules for Concluding Connectivity Checks  . . . . . .  26
     4.7.  NAT Traversal Optimizations . . . . . . . . . . . . . . .  27
       4.7.1.  Minimal NAT Traversal Support . . . . . . . . . . . .  27
       4.7.2.  Base Exchange without Connectivity Checks . . . . . .  27
       4.7.3.  Initiating a Base Exchange both with and without UDP
               Encapsulation . . . . . . . . . . . . . . . . . . . .  29
     4.8.  Sending Control Packets after the Base Exchange . . . . .  29
     4.9.  Mobility Handover Procedure . . . . . . . . . . . . . . .  30
     4.10. NAT Keepalives  . . . . . . . . . . . . . . . . . . . . .  34
     4.11. Closing Procedure . . . . . . . . . . . . . . . . . . . .  35
     4.12. Relaying Considerations . . . . . . . . . . . . . . . . .  35
       4.12.1.  Forwarding Rules and Permissions . . . . . . . . . .  35
       4.12.2.  HIP Data Relay and Relaying of Control Packets . . .  36
       4.12.3.  Handling Conflicting SPI Values  . . . . . . . . . .  37
   5.  Packet Formats  . . . . . . . . . . . . . . . . . . . . . . .  38
     5.1.  HIP Control Packets . . . . . . . . . . . . . . . . . . .  38
     5.2.  Connectivity Checks . . . . . . . . . . . . . . . . . . .  40
     5.3.  Keepalives  . . . . . . . . . . . . . . . . . . . . . . .  40
     5.4.  NAT Traversal Mode Parameter  . . . . . . . . . . . . . .  40
     5.5.  Connectivity Check Transaction Pacing Parameter . . . . .  41
     5.6.  Relay and Registration Parameters . . . . . . . . . . . .  42
     5.7.  LOCATOR_SET Parameter . . . . . . . . . . . . . . . . . .  43