ZyXEL Communications VPN Series Handbook page 26

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Then, configure the Secure Gateway IP as the peer Amazon VPC's Gateway IP
address (in the example, 52.39.135.203); select My Address to be the interface
connected to the Internet.
Set the Negotiation, Encryption, Authentication, Key Group and SA Life Time
which Amazon VPC supports. Type a secure Pre-Shared Key.
Quick Setup > VPN Setup Wizard > Welcome > Wizard Type > VPN Settings (Phase 1
Setting)
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