Applicability Statement for IP Mobility Support (RFC2005)
Original Publication Date: 1996-Oct-01
Included in the Prior Art Database: 2000-Sep-13
Internet Society Requests For Comment (RFCs)
As required by [RFC 1264], this report discusses the applicability of Mobile IP to provide host mobility in the Internet. In particular, this document describes the key features of Mobile IP and shows how the requirements for advancement to Proposed Standard RFC have been satisfied.
Network Working Group J. Solomon
Request for Comments: 2005 Motorola
Category: Standards Track October 1996
Applicability Statement for IP Mobility Support
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.
As required by [RFC 1264], this report discusses the applicability of
Mobile IP to provide host mobility in the Internet. In particular,
this document describes the key features of Mobile IP and shows how
the requirements for advancement to Proposed Standard RFC have been
1. Protocol Overview
Mobile IP provides an efficient, scalable mechanism for node mobility
within the Internet. Using Mobile IP, nodes may change their point-
of-attachment to the Internet without changing their IP address.
This allows them to maintain transport and higher-layer connections
while moving. Node mobility is realized without the need to
propagate host-specific routes throughout the Internet routing
fabric. The protocol is documented in [MIP-PROTO].
In brief, Mobile IP routing works as follows. Packets destined to a
mobile node are routed first to its home network -- a network
identified by the network prefix of the mobile node's (permanent)
home address. At the home network, the mobile node's home agent
intercepts such packets and tunnels them to the mobile node's most
recently reported care-of address. At the endpoint of the tunnel,
the inner packets are decapsulated and delivered to the mobile node.
In the reverse direction, packets sourced by mobile nodes are routed
to their destination using standard IP routing mechanisms.
Thus, Mobile IP relies on protocol tunneling to deliver packets to
mobile nodes that are away from their home network. The mobile
node's home address is hidden from routers along the path from the
home agent to the mobile node due to the presence of the tunnel. The
encapsulating packet is destined to the mobile node's care-of address
-- a topologically significant address -- to which standard IP
routing mechanisms can deliver packets.
The Mobile IP protocol defines the following:
- an authenticated registration procedure by which a mobile node
informs its home agent(s) of its care-of address(es);
- an extension to ICMP Router Discovery [RFC1256] which allows mobile
nodes to discover prospective home agents and foreign agents; and
- the rules for routing packets to and from mobile nodes, including
the specification of one mandatory tunneling mechanism ([MIP-IPinIP])
and several optional tunneling mechanisms (...