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IKE Phase 2 Screen
This screen sets the parameters for the IPSec SA. When using IKE, there are separate connec-
tions (SAs) for IKE and IPSec.
Figure56: VPN Wizard - IKE Phase 2 Screen
IKE Phase 2 (IPsec SA)
IPsec SA Life Time
This setting does not have to match the remote VPN endpoint; the
shorter time will be used. Although measured in seconds, it is
common to use time periods of several hours, such 28,800 seconds.
IPSec PFS
If enabled, PFS (Perfect Forward Security) enhances security by
changing the IPsec key at regular intervals, and ensuring that each
key has no relationship to the previous key. Thus, breaking 1 key
will not assist in breaking the next key.
AH Authentication
AH (Authentication Header) specifies the authentication protocol
for the VPN header, if used.
AH is often NOT used. If you do enable it, ensure the algorithm
selected matches the other VPN endpoint.
ESP Encryption
ESP (Encapsulating Security Payload) provides security for the
payload (data) sent through the VPN tunnel. Generally, you will
want to enable both ESP Encryption and ESP Authentication.
Select the desired method, and ensure the remote VPN endpoint
uses the same method.
• The 3DES algorithm provides greater security than DES, but is
slower.
• If using AES, you must select the Key Size. If using DES or
3DES, this field is ignored.
ESP Authentication
Generally, you should enable ESP Authentication. There is little
difference between the available algorithms. Just ensure each
endpoint use the same setting.