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NAT traversal for LISP
draft-ermagan-lisp-nat-traversal-06

Document type: Active Internet-Draft (individual)
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Last updated: 2014-08-12
Intended RFC status: Unknown
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Network Working Group                                         V. Ermagan
Internet-Draft                                       Cisco Systems, Inc.
Intended status: Experimental                               D. Farinacci
Expires: February 13, 2015                                   lispers.net
                                                                D. Lewis
                                                              J. Skriver
                                                                F. Maino
                                                     Cisco Systems, Inc.
                                                                C. White
                                                   Logicalelegance, Inc.
                                                         August 12, 2014

                         NAT traversal for LISP
                draft-ermagan-lisp-nat-traversal-06.txt

Abstract

   This document describes a mechanism for IPv4 NAT traversal for LISP
   tunnel routers (xTR) and LISP Mobile Nodes (LISP-MN) behind a NAT
   device.  A LISP device both detects the NAT and initializes its
   state.  Forwarding to the LISP device through a NAT is enabled by the
   LISP Re-encapsulating Tunnel Router (RTR) network element, which acts
   as an anchor point in the data plane, forwarding traffic from
   unmodified LISP devices through the NAT.

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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   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 February 13, 2015.

Copyright Notice

   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Ermagan, et al.         Expires February 13, 2015               [Page 1]
Internet-Draft           NAT traversal for LISP              August 2014

   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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Definition of Terms . . . . . . . . . . . . . . . . . . . . .   3
   3.  Basic Overview  . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  LISP RTR Message Details  . . . . . . . . . . . . . . . . . .   5
     4.1.  Info-Request Message  . . . . . . . . . . . . . . . . . .   5
     4.2.  LISP Info-Reply . . . . . . . . . . . . . . . . . . . . .   7
     4.3.  LISP Map-Register Message . . . . . . . . . . . . . . . .   9
     4.4.  LISP Map-Notify . . . . . . . . . . . . . . . . . . . . .  10
     4.5.  LISP Data-Map-Notify Message  . . . . . . . . . . . . . .  11
   5.  Protocol Operations . . . . . . . . . . . . . . . . . . . . .  13
     5.1.  xTR Processing  . . . . . . . . . . . . . . . . . . . . .  13
       5.1.1.  ETR Registration  . . . . . . . . . . . . . . . . . .  14
       5.1.2.  Map-Request and Map-Reply Handling  . . . . . . . . .  15
       5.1.3.  xTR  Sending and Receiving Data . . . . . . . . . . .  16
     5.2.  Map-Server Processing . . . . . . . . . . . . . . . . . .  16
     5.3.  RTR Processing  . . . . . . . . . . . . . . . . . . . . .  17
       5.3.1.  RTR Data Forwarding . . . . . . . . . . . . . . . . .  19
     5.4.  Example . . . . . . . . . . . . . . . . . . . . . . . . .  20
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  23
     6.1.  Acknowledgments . . . . . . . . . . . . . . . . . . . . .  24
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  24
   8.  Normative References  . . . . . . . . . . . . . . . . . . . .  24
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  24

1.  Introduction

   The Locator/ID Separation Protocol [LISP] defines a set of functions
   for encapsulating routers to exchange information used to map from

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