Configuring Advanced Ike Settings; Figure 14-5 Vpn Ike: Advanced - ZyXEL Communications Prestige 792H User Manual

G.shdsl 4-port security gateway

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Prestige 792H User's Guide

previous and subsequent keys are not compromised, because subsequent keys are not derived from previous

keys. The (time-consuming) Diffie-Hellman exchange is the trade-off for this extra security.

This may be unnecessary for data that does not require such security, so PFS is disabled (None) by default in

the Prestige. Disabling PFS means new authentication and encryption keys are derived from the same root

secret (which may have security implications in the long run) but allows faster SA setup (by bypassing the

Diffie-Hellman key exchange).

14.11 Configuring Advanced IKE Settings

Click Advanced in the VPN IKE screen. This is the VPN IKE- Advanced screen as shown next.