I-D ACTION:draft-yegani-gre-key-extension-03.txt

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	Title		: GRE Key Extension for Mobile IPv4
	Author(s)	: P. Yegani, et al.
	Filename	: draft-yegani-gre-key-extension-03.txt
	Pages		: 9
	Date		: 2007-7-8
	
The 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 setup the necessary protocol
   interfaces prior to receiving the mobile's traffic.  The new
   extension option allows a foreign agent to request GRE tunneling
   without disturbing the Home Agent behavior specified for Mobile Ipv4.
   GRE tunneling provides an advantage that allows operator's private
   home networks to be overlaid and allows the HA to provide overlapping
   home addresses to different subscribers.  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 FA and HA 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.

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