Mobile IP Network Access Identifier Extension for IPv4
RFC 2794
| Document | Type |
RFC - Proposed Standard
(March 2000; No errata)
Updates RFC 2290
|
|
|---|---|---|---|
| Last updated | 2013-03-02 | ||
| Stream | IETF | ||
| Formats | plain text pdf html bibtex | ||
| Stream | WG state | (None) | |
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | RFC 2794 (Proposed Standard) | |
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | (None) | ||
| Send notices to | (None) | ||
Network Working Group P. Calhoun
Request for Comments: 2794 Sun Microsystems Laboratories
Updates: 2290 C. Perkins
Category: Standards Track Nokia Research Center
March 2000
Mobile IP Network Access Identifier Extension for IPv4
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 (2000). All Rights Reserved.
Abstract
AAA servers are in use within the Internet today to provide
authentication and authorization services for dial-up computers.
Such services are likely to be equally valuable for mobile nodes
using Mobile IP when the nodes are attempting to connect to foreign
domains with AAA servers. AAA servers today identify clients by
using the Network Access Identifier (NAI). Our proposal defines a way
for the mobile node to identify itself, by including the NAI along
with the Mobile IP Registration Request. This memo also updates RFC
2290 which specifies the Mobile-IPv4 Configuration option for IPCP,
by allowing the Mobile Node's Home Address field of this option to be
zero.
Calhoun & Perkins Standards Track [Page 1]
RFC 2794 Mobile Node NAI March 2000
1. Introduction
AAA servers are in use within the Internet today to provide
authentication and authorization services for dial-up computers.
Such services are likely to be equally valuable for mobile nodes
using Mobile IP when the nodes are attempting to connect to foreign
domains with AAA servers. AAA servers today identify clients by
using the Network Access Identifier (NAI) [1]. This document
specifies the Mobile Node NAI extension to the Mobile IP Registration
Request [7] message from the mobile node.
Since the NAI is typically used to uniquely identify the mobile node,
the mobile node's home address is not always necessary to provide
that function. Thus, it is possible for a mobile node to
authenticate itself, and be authorized for connection to the foreign
domain, without even having a home address. A message containing the
Mobile Node NAI extension MAY set the Home Address field to zero (0)
in the Registration Request, to request that a home address be
assigned.
The "Mobile-IPv4 Configuration" option to IPCP has been specified in
RFC 2290 [8] for proper interaction between a mobile node and a peer,
through which the mobile node connects to the network using PPP.
According to that specification the Mobile Node's Home Address field
of the option MUST not be zero. However, in the context of this memo
which allows a mobile node to be identified by its NAI and to obtain
an address after the PPP phase of connection establishment, the Home
Address field is allowed to be zero while maintaining all other
aspects of RFC 2290. Interpretation of various scenarios from RFC
2290 is given in section 4.
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [3].
2. Mobile Node NAI Extension
The Mobile Node NAI extension, shown in figure 1, contains the user
name following the format defined in [1]. When it is present in the
Registration Request, the Home Address field MAY be set to zero (0).
The Mobile Node NAI extension MUST appear in the Registration Request
before both the Mobile-Home Authentication extension and Mobile-
Foreign Authentication extension, if present.
Calhoun & Perkins Standards Track [Page 2]
RFC 2794 Mobile Node NAI March 2000
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length | MN-NAI ...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 1: The Mobile Node NAI Extension
Type 131 (skippable) [7]
Length The length in bytes of the MN-NAI field
MN-NAI A string in the NAI format defined in [1].
3. Foreign Agent Considerations
If Home Address is zero in the Registration Request, the foreign
agent MUST use the NAI instead in its pending registration request
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