ZyXEL Communications ZyWALL 5 Support Notes page 185

5. Secure Gateway IP Addr is the FortiNet's WAN IP address. In this example, you should type
172.22.2.138 IP address on Remote Gateway text box.
6. In Authentication Key, enter the key string 12345678 in the Pre-Shared Key text box.
7. Select Negotiation Mode to Main mode, Encryption Algorithm to DES, Authentication
Algorithm to MD5, Key Group to DH1, and then click Apply button on this page.
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ZyWALL 5 Support Notes
185