Ike Phases; Figure 65 Two Phases To Set Up The Ipsec Sa - ZyXEL Communications Wireless Router P-334 User Manual

Prestige 334 User's Guide
Table 51 VPN: Rule Setup (Basic)
LABEL
Authentication
Algorithm
Advanced
Apply
Reset

15.11 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 65 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.
167
DESCRIPTION
Select SHA1 or MD5 from the drop-down list box. MD5 (Message Digest 5) and
SHA1 (Secure Hash Algorithm) are hash algorithms used to authenticate packet
data. The SHA1 algorithm is generally considered stronger than MD5, but is
slower. Select MD5 for minimal security and SHA-1 for maximum security.
Click Advanced to configure more detailed settings of your IKE key
management.
Click Apply to save your changes back to the Prestige.
Click Reset to begin configuring this screen afresh.
Chapter 15 VPN Screens