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RFC 6245
Title: Generic Routing Encapsulation (GRE) Key
Extension for Mobile IPv4
Author: P. Yegani, K. Leung,
A. Lior, K. Chowdhury,
J. Navali
Status: Standards Track
Stream: IETF
Date: May 2011
Mailbox: pyegani@juniper.net,
kleung@cisco.com,
avi@bridgewatersystems.com, kchowdhu@cisco.com,
jnavali@cisco.com
Pages: 8
Characters: 16823
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-ietf-mip4-gre-key-extension-05.txt
URL: http://www.rfc-editor.org/rfc/rfc6245.txt
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. [STANDARDS-TRACK]
This document is a product of the Mobility for IPv4 Working Group of the IETF.
This is now a Proposed Standard Protocol.
STANDARDS TRACK: 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.
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