ZyXEL Communications VPN Series Handbook page 174

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Type the Rule Name used to identify this VPN connection (and VPN gateway).
You may use 1-31 alphanumeric characters. This value is case-sensitive. Select the
rule to be Site-to-site. Click Next.
Quick Setup > VPN Setup Wizard > Wizard Type > VPN Settings (Scenario)
Configure Secure Gateway IP as the FortiGate's WAN IP address (in the example,
172.100.30.40). Then, type a secure Pre-Shared Key (8-32 characters).
Set Local Policy to be the IP address range of the network connected to the
ZyWALL/USG and Remote Policy to be the IP address range of the network
connected to the FortiGate.
Quick Setup > VPN Setup Wizard > Wizard Type > VPN Settings (Configuration)
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