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Prestige 2602H/HW Series User’s Guide
Chapter 17 VPN Screens 227
Figure 96 Two Phases to Set Up the IPSec SA
In phase 1 you must:
• Choose a negotiation mode.
• Authenticate the connection by entering a pre-shared key.
• Choose an encryption algorithm.
• Choose an authentication algorithm.
• Choose a Diffie-Hellman public-key cryptography key group (DH1 or DH2).
• Set the IKE SA lifetime. This field allows you to determine how long an IKE SA should
stay up before it times out. An IKE SA times out when the IKE SA lifetime period
expires. If an IKE SA times out when an IPSec SA is already established, the IPSec SA
stays connected.
In phase 2 you must:
• Choose which protocol to use (ESP or AH) for the IKE key exchange.
• Choose an encryption algorithm.
• Choose an authentication algorithm
• Choose whether to enable Perfect Forward Secrecy (PFS) using Diffie-Hellman public-
key cryptography – see Section 17.12.3 on page 228. Select None (the default) to disable
PFS.
• Choose Tunnel mode or Transport mode.
• Set the IPSec SA lifetime. This field allows you to determine how long the IPSec SA
should stay up before it times out. The Prestige automatically renegotiates the IPSec SA
if there is traffic when the IPSec SA lifetime period expires. The Prestige also
automatically renegotiates the IPSec SA if both IPSec routers have keep alive enabled,
even if there is no traffic. If an IPSec SA times out, then the IPSec router must renegotiate
the SA the next time someone attempts to send traffic.