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Mobile IP Traversal of Network Address Translation (NAT) Devices (RFC3519)

IP.com Disclosure Number: IPCOM000012213D
Original Publication Date: 2003-May-01
Included in the Prior Art Database: 2003-May-20
Document File: 35 page(s) / 80K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

H. Levkowetz: AUTHOR [+2]

Abstract

Mobile IP's datagram tunnelling is incompatible with Network Address Translation (NAT). This document presents extensions to the Mobile IP protocol and a tunnelling method which permits mobile nodes using Mobile IP to operate in private address networks which are separated from the public internet by NAT devices. The NAT traversal is based on using the Mobile IP Home Agent UDP port for encapsulated data traffic.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 4% of the total text.

Network Working Group                                       H. Levkowetz

Request for Comments: 3519                                   ipUnplugged

Category: Standards Track                                     S. Vaarala

                                                                 Netseal

                                                              April 2003

    Mobile IP Traversal of Network Address Translation (NAT) Devices

Status of this Memo

   This document specifies an Internet standards track protocol for the

   Internet community, and requests discussion and suggestions for

   improvements.  Please refer to the current edition of the "Internet

   Official Protocol Standards" (STD 1) for the standardization state

   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2003).  All Rights Reserved.

Abstract

   Mobile IP's datagram tunnelling is incompatible with Network Address

   Translation (NAT).  This document presents extensions to the Mobile

   IP protocol and a tunnelling method which permits mobile nodes using

   Mobile IP to operate in private address networks which are separated

   from the public internet by NAT devices.  The NAT traversal is based

   on using the Mobile IP Home Agent UDP port for encapsulated data

   traffic.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .  2

       1.1   Terminology . . . . . . . . . . . . . . . . . . . . . .  2

       1.2   Problem description . . . . . . . . . . . . . . . . . .  3

       1.3   Assumptions . . . . . . . . . . . . . . . . . . . . . .  4

   2.  NAT Traversal Overview. . . . . . . . . . . . . . . . . . . .  5

       2.1   Basic Message Sequence. . . . . . . . . . . . . . . . .  5

   3.  New Message Formats . . . . . . . . . . . . . . . . . . . . .  6

       3.1   UDP Tunnel Request Extension. . . . . . . . . . . . . .  6

             3.1.1 F (Force) Flag. . . . . . . . . . . . . . . . . .  7

             3.1.2 R (Registration through FA Required) flag . . . .  8

             3.1.3 Reserved Fields . . . . . . . . . . . . . . . . .  8

             3.1.4 Encapsulation . . . . . . . . . . . . . . . . . .  8

             3.1.5 Mobile IP Registration Bits . . . . . . . . . . .  9

       3.2   UDP Tunnel Reply Extension. . . . . . . . . . . . . . .  9

             3.2.1 Reply Code. . . . . . . . . . . . . . . . . . . . 10

Levkowetz & Vaarala         Standards Track                     [Page 1]

RFC 3519              NAT Traversal for Mobile IP             April 2003

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