ZyXEL Communications P-202 - Manual (Page 268)

P-202H Plus v2 Support Notes
If you use SMT management, the VPN configurations are as shown below.
1. Edit IKE settings by selecting 'Edit Key Management Setup' option in
menu27.1.1 to 'Yes' by pressing space bar and then pressing 'Enter'.
2. There are two phases for IKE:
In Phase 1, two IKE peers establish a secure channel for key exchanging.
In Phase 2, two peers negotiate IPSec SAs which are used for data transmission.
Please note that Linux FreeS/WAN only supports 3DES as encryption algorithm,
and DH2 or upper as key exchange group.
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