[IPsec] I-D Action:draft-ietf-ipsecme-ikev2-resumption-09.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 Security Maintenance and Extensions Working Group of the IETF.


	Title           : IKEv2 Session Resumption
	Author(s)       : Y. Sheffer, H. Tschofenig
	Filename        : draft-ietf-ipsecme-ikev2-resumption-09.txt
	Pages           : 29
	Date            : 2009-10-21

The Internet Key Exchange version 2 (IKEv2) protocol has a certain
computational and communication overhead with respect to the number
of round-trips required and the cryptographic operations involved.
In remote access situations, the Extensible Authentication Protocol
(EAP) is used for authentication, which adds several more round trips
and consequently latency.

To re-establish security associations (SAs) upon a failure recovery
condition is time consuming especially when an IPsec peer (such as a
VPN gateway) needs to re-establish a large number of SAs with various
end points.  A high number of concurrent sessions might cause
additional problems for an IPsec peer during SA re-establishment.

In order to avoid the need to re-run the key exchange protocol from
scratch it would be useful to provide an efficient way to resume an
IKE/IPsec session.  This document proposes an extension to IKEv2 that
allows a client to re-establish an IKE SA with a gateway in a highly
efficient manner, utilizing a previously established IKE SA.

A client can reconnect to a gateway from which it was disconnected.
The proposed approach encodes partial IKE state into an opaque
ticket, which can be stored on the client or in a centralized store,
and is later made available to the IKEv2 responder for re-
authentication.  We use the term ticket to refer to the opaque data
that is created by the IKEv2 responder.  This document does not
specify the format of the ticket but examples are provided.

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