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Chapter 21 IPSec

VSG1432-B101 Series User’s Guide

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21.4.3 IKE Phases

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 122 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 an encryption algorithm.

• Choose an authentication algorithm

• Choose a Diffie-Hellman public-key cryptography key group.

• Set the IPSec SA lifetime. This field allows you to determine how long the IPSec

SA should stay up before it times out. The ZyXEL Device automatically

renegotiates the IPSec SA if there is traffic when the IPSec SA lifetime period

expires. If an IPSec SA times out, then the IPSec router must renegotiate the

SA the next time someone attempts to send traffic.

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