Ike Phases; Figure 144 Two Phases To Set Up The Ipsec Sa - ZyXEL Communications P-2602H User Manual

Chapter 18 VPN Screens
Table 96 Edit VPN Policies
LABEL
Cancel
Advanced Setup

18.12 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 144 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.
• Choose Tunnel mode or Transport mode.
250
DESCRIPTION
Click Cancel to begin configuring this screen afresh.
Click Advanced Setup to configure more detailed settings of your IKE key
management.
Section 18.12.3 on page 251. Select None (the default) to disable
P-2602H(W)(L)-DxA User's Guide