ZyXEL Communications 70 Series - Manual (Page 99)

ZyWALL 5/35/70 Series User’s Guide
99 Chapter 3 Wizard Setup
3.7 VPN Wizard Status Summary
This read-only screen shows the status of the current VPN setting. Use the summary table to
check whether what you have configured is correct.
SA Life Time
(Seconds)
Define the length of time before an IKE SA automatically renegotiates in this
field. The minimum value is 180 seconds.
A short SA Life Time increases security by forcing the two VPN gateways to
update the encryption and authentication keys. However, every time the VPN
tunnel renegotiates, all users accessing remote resources are temporarily
disconnected.
Perfect Forward
Secret (PFS)
Perfect Forward Secret (PFS) is disabled (None) by default in phase 2 IPSec
SA setup. This allows faster IPSec setup, but is not so secure.
Select DH1 or DH2 to enable PFS. DH1 refers to Diffie-Hellman Group 1 a 768
bit random number. DH2 refers to Diffie-Hellman Group 2 a 1024 bit (1Kb)
random number (more secure, yet slower).
Back Click Back to return to the previous screen.
Next Click Next to continue.
Table 18 VPN Wizard: IPSec Setting (continued)
LABEL DESCRIPTION