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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.

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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

� � � � � � 3.3...