I-D ACTION:draft-ietf-mobileip-reg-revok-03.txt

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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the IP Routing for Wireless/Mobile Hosts Working Group of the IETF.

	Title		: Registration Revocation in Mobile IP
	Author(s)	: S. Glass, M. Chandra
	Filename	: draft-ietf-mobileip-reg-revok-03.txt
	Pages		: 37
	Date		: 28-Jun-02
	
During the original design of Mobile IP, the need for an
administrative domain to be able to actively revoke a current Mobile
IP registration was recognized.  Due to the lack of a specific
scenario requiring such a mechanism, it was decided that instead of an
active revocation mechanism explicitly for the purpose of registration
revocation, a passive mechanism, namely short registration lifetimes,
and the denial of a subsequent registrations from a mobile node, would
likely be sufficient for this purpose.
Investigations into requirements for a AAA protocol within the AAA
working group have forced reconsideration of a more pro-active Mobile
IP registration revocation feature whereby both domains providing
Mobile IP services can be made aware that the service is being suspended.

In the ideal model, revocations must be possible from either home
or foreign domains, so any registration revocation mechanism being
defined must provide a signaling mechanism between the two that
identify registration(s) being released, implying that since Mobile IP
services are no longer being provided on one side of the registration,
they need not be provided on the other.  In some cases the current
registration may be terminated to simply force the mobile node to
renegotiate its registration, but in other cases renegotiation may not
be allowed.  Either one of these reasons is sufficient to justify this
mechanism.

Moreover, there should also be a mechanism in place whereby the
mobile node whose registration has been terminated can also be
informed that such a revocation has occurred, if only so it may
understand it is not longer being provided Mobile IP services, though
the reasons for such a revocation need not necessarily be immediately
relayed.  This mechanism would ideally be independent of the
signaling mechanism between the agents identified above so as to
leave actual notification of the mobile node up to a separate policy 
of the domains in question

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