Internet Engineering Task Force (IETF) P. Yegani
Request for Comments: 6245 Juniper Networks
Category: Standards Track K. Leung
ISSN: 2070-1721 Cisco Systems
A. Lior
Bridgewater Systems
K. Chowdhury
J. Navali
Cisco Systems
May 2011
Generic Routing Encapsulation (GRE) Key Extension for Mobile IPv4
Abstract
The Generic Routing Encapsulation (GRE) specification contains a Key
field, which MAY contain a value that is used to identify a
particular GRE data stream. This specification defines a new Mobile
IP extension that is used to exchange the value to be used in the GRE
Key field. This extension further allows the Mobility Agents to set
up the necessary protocol interfaces prior to receiving the mobile
node traffic. The new extension allows a Foreign Agent to request
GRE tunneling without disturbing the Home Agent behavior specified
for Mobile IPv4. GRE tunneling with the Key field allows the
operators to have home networks that consist of multiple Virtual
Private Networks (VPNs), which may have overlapping home addresses.
When the tuple <Care of Address, Home Address, and Home Agent
Address> is the same across multiple subscriber sessions, GRE
tunneling will provide a means for the Foreign Agent and Home Agent
to identify data streams for the individual sessions based on the GRE
key. In the absence of this key identifier, the data streams cannot
be distinguished from each other -- a significant drawback when using
IP-in-IP tunneling.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc6245.
Yegani, et al. Standards Track [Page 1]RFC 6245 GRE Key Ext. for MIP4 May 2011Copyright Notice
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Table of Contents
1. Introduction ....................................................2
2. Terminology .....................................................3
3. GRE Key Extension ...............................................3
4. Operation and Use of the GRE Key Extension ......................3
4.1. Foreign Agent Requirements for GRE Tunneling Support .......3
4.2. Home Agent Requirements for GRE Tunneling Support ..........4
4.3. Mobile Node Requirements for GRE Tunneling Support .........5
5. GRE Key Extension and Tunneling Procedures ......................5
6. IANA Considerations .............................................6
7. Security Considerations .........................................6
8. Acknowledgements ................................................7
9. Normative References ............................................7
1. Introduction
This document specifies a new extension for use by a Foreign Agent
(FA) operating Mobile IP for IPv4. The new extension allows a
Foreign Agent to request Generic Routing Encapsulation (GRE)
[RFC2784] tunneling without disturbing the Home Agent (HA) behavior
specified for Mobile IPv4 [RFC5944]. This extension contains the GRE
key [RFC2890] required for establishing a GRE tunnel between the FA
and the HA.
GRE tunneling with the Key field allows the operators to have home
datatracker.ietf.org