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Mobile-IPv4 Configuration Option for PPP IPCP
RFC 2290

Document type: RFC - Proposed Standard (February 1998)
Updated by RFC 2794
Updates RFC 2002
Document stream: IETF
Last updated: 2013-03-02
Other versions: plain text, pdf, html

IETF State: (None)
Consensus: Unknown
Document shepherd: No shepherd assigned

IESG State: RFC 2290 (Proposed Standard)
Responsible AD: (None)
Send notices to: No addresses provided

Network Working Group                                         J. Solomon
Request for Comments: 2290                                      Motorola
Updates: 2002                                                   S. Glass
Category: Standards Track                                   FTP Software
                                                           February 1998

             Mobile-IPv4 Configuration Option for PPP IPCP

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 (1998).  All Rights Reserved.

Abstract

   Mobile IP [RFC 2002] defines media-independent procedures by which a
   Mobile Node can maintain existing transport and application-layer
   connections despite changing its point-of-attachment to the Internet
   and without changing its IP address.  PPP [RFC 1661] provides a
   standard method for transporting multi-protocol packets over point-
   to-point links.  As currently specified, Mobile IP Foreign Agents
   which support Mobile Node connections via PPP can do so only by first
   assigning unique addresses to those Mobile Nodes, defeating one of
   the primary advantages of Foreign Agents.  This documents corrects
   this problem by defining the Mobile-IPv4 Configuration Option to the
   Internet Protocol Control Protocol (IPCP) [RFC 1332].  Using this
   option, two peers can communicate their support for Mobile IP during
   the IPCP phase of PPP.  Familiarity with Mobile IP [RFC 2002], IPCP
   [RFC 1332], and PPP [RFC 1661] is assumed.

Table of Contents

   1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . .   2
       1.1. Specification Language . . . . . . . . . . . . . . . . .   2
       1.2. Terminology  . . . . . . . . . . . . . . . . . . . . . .   2
       1.3. Problem Statement  . . . . . . . . . . . . . . . . . . .   3
       1.4. Requirements . . . . . . . . . . . . . . . . . . . . . .   5
   2. Mobile-IPv4 Configuration Option . . . . . . . . . . . . . . .   6
       2.1. Option Format  . . . . . . . . . . . . . . . . . . . . .   6
       2.2. Overview . . . . . . . . . . . . . . . . . . . . . . . .   7

Solomon & Glass             Standards Track                     [Page 1]
RFC 2290            Mobile-IPv4 Option for PPP IPCP        February 1998

       2.3. High-Level Requirements for Non-Mobile-Nodes . . . . . .   7
       2.4. High-Level Requirements for Mobile Nodes . . . . . . . .   8
       2.5. Detailed Description . . . . . . . . . . . . . . . . . .   8
       2.6. Example Scenarios  . . . . . . . . . . . . . . . . . . .  12
   3. Additional Requirements  . . . . . . . . . . . . . . . . . . .  14
       3.1. Other IPCP Options . . . . . . . . . . . . . . . . . . .  14
       3.2. Move Detection . . . . . . . . . . . . . . . . . . . . .  14
   4. Security Considerations  . . . . . . . . . . . . . . . . . . .  15
   5. References . . . . . . . . . . . . . . . . . . . . . . . . . .  15
   6. Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . .  16
   7. Authors' Addresses . . . . . . . . . . . . . . . . . . . . . .  16
   8. Full Copyright Statement . . . . . . . . . . . . . . . . . . .  17

1. Introduction

   Mobile IP [RFC 2002] defines protocols and procedures by which
   packets can be routed to a mobile node, regardless of its current
   point-of-attachment to the Internet, and without changing its IP
   address.  Mobile IP is designed to run over any type of media and any
   type of data link-layer.  However, the interaction between Mobile IP
   and PPP is currently underspecified and generally results in an
   inappropriate application of Mobile IP when mobile nodes connect to
   the Internet via PPP.

   This document defines proper interaction between a mobile node [RFC
   2002] and a peer through which the mobile node connects to the
   Internet using PPP.  This requires the definition of a new option for
   IPCP [RFC 1332], named the "Mobile-IPv4" Configuration Option, which
   is defined in this document.  The mobile node and the peer use this
   option to negotiate the appropriate use of Mobile IP over the PPP
   link.

   The Mobile-IPv4 option defined in this document is intended to work
   in conjunction with the existing IP-Address option [RFC 1332].

1.1. Specification Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this

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