Ike Phases; Figure 15-6 Two Phases To Set Up The Ipsec Sa - ZyXEL Communications ZyWall 10W User Manual

LABEL
Authentication
Algorithm
Advanced
Apply
Reset

15.12 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.
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:
VPN Screens
Table 15-7 VPN IKE
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 ZyWALL.
Click Reset to begin configuring this screen afresh.

Figure 15-6 Two Phases to Set Up the IPSec SA

ZyWALL Series Internet Security Gateway
DESCRIPTION
15-19