NAT traversal for LISP
draft-ermagan-lisp-nat-traversal-05

Network Working Group                                         V. Ermagan
Internet-Draft                                       Cisco Systems, Inc.
Intended status: Experimental                               D. Farinacci
Expires: August 17, 2014                                     lispers.net
                                                                D. Lewis
                                                              J. Skriver
                                                                F. Maino
                                                     Cisco Systems, Inc.
                                                                C. White
                                                   Logicalelegance, Inc.
                                                       February 13, 2014

                         NAT traversal for LISP
                draft-ermagan-lisp-nat-traversal-05.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

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   This Internet-Draft will expire on August 17, 2014.

Copyright Notice

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

Ermagan, et al.          Expires August 17, 2014                [Page 1]
Internet-Draft           NAT traversal for LISP            February 2014

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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
   Endpoint Identifiers (EIDs) to routable Routing Locators (RLOCs).