PLANET CS-2001 - Manual (Page 359)

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Figure 11-199 Configuring the IPSec Algorithm
Step6. Under the IPSec Algorithm section, select 3DES for Encryption
Algorithm and then select MD5 for Authentication Algorithm. （Figure
11-200）
Figure 11-200 Configuring the IPSec Algorithm
Step7. Under the Advanced Settings (optional) section, select GROUP 1 for PFS
Key Group, enter 3600 in the ISAKMP SA Lifetime field, enter 28800 in
the IPSec SA Lifetime field and then select Main mode for Mode. （Figure
11-201）
Figure 11-201 Configuring the PFS Key Group, ISAKMP SA Lifetime, IPSec SA Lifetime and
Mode