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Journal of Information Science and Engineering, Vol. 24 No. 5, pp. 1329-1346 (September 2008)

FASiRec: A Fast Session Recovery Scheme for Large-scale VPNs Using IPSec*

Jeong-Beom Kim, MoonBae Song, Chong-Sun Hwang and SangKeun Lee+
Department of Computer Science and Engineering
Korea University
Seoul, 136-701 Korea

As a de facto standard protocol, Internet protocol security (IPSec) provides secure communication between networked systems. One of the most common issues today in large-scale virtual private networks using IPSec is the problem of a stale security association, which occurs when the device at one end of the tunnel maintains the tunnel state but the other end does not. Internet key exchange (IKE) keepalives resolve this by removing the state of the old tunnel and setting up a new tunnel. In particular, the loss of state by a security gateway requires multiple hosts to reestablish tunnels, resulting in high network costs in time, bandwidth usage, etc. The resulting time delay can lead to poor performance, which in turn increases the packet drop rate. To solve this problem, we propose the Fast Session Recovery scheme for IPSec, which reestablishes tunnels, not by renegotiating the session key using IKE, but by backing up the session key. We tested the proposed scheme with an experiment which showed that it can significantly speed up the session reestablishment while increasing total throughput in the network.

Keywords: internet security protocol, system performance, session recovery, internet key exchange, FASiRec

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Received November 6, 2006; revised May 18 & August 14, 2007; accepted October 18, 2007.
Communicated by Chin-Teng Lin.
*This work was supported by the Second Brain Korea 21 Project. + Corresponding author.