Ike Phases; Figure 86 Two Phases To Set Up The Ipsec Sa - ZyXEL Communications P-334WT User Manual

P-334WT User's Guide
Table 70 VPN Rule Setup (continued)
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12.11 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 86 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
PFS.
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Chapter 12 VPN Screens