A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : IPsec Gateway Failover Protocol
Author(s) : Y. Sheffer, et al.
Filename : draft-sheffer-ipsec-failover-01.txt
Pages : 22
Date : 2007-11-15
The Internet Key Exchange version 2 (IKEv2) protocol has
computational and communication overhead with respect to the number
of round-trips required and cryptographic operations involved. In
remote access situations, the Extensible Authentication Protocol is
used for authentication, which adds additional latency.
To re-establish security associations (SA) 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 many failure cases it would be useful to provide an efficient way
to resume an interrupted 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,
or alternatively migrate to another gateway that is associated with
the previous one. The proposed approach conveys IKEv2 state
information, in the form of an encrypted ticket, to a VPN client that
is later presented to the VPN gateway for re-authentication. An
encrypted ticket cannot be decrypted by a VPN client but allows a VPN
gateway to restore state for faster session state setup.
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