ZyXEL Communications P-335WT User Manual

P-335 Series User’s Guide

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Chapter 13 VPN Screens

There are two phases to every IKE (Internet Key Exchange) negotiation – phase 1 
(Authentication) and phase 2 (Key Exchange). A phase 1 exchange establishes an IKE SA and 
the second one uses that SA to negotiate SAs for IPSec. 

Figure 90   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

Advanced

Click Advanced to configure more detailed settings of your IKE key 

management.

Apply

Click Apply to save your changes back to the Prestige.

Reset

Click Reset to begin configuring this screen afresh.

Table 72   Rule Setup (continued)