ZyXEL Communications ZyWALL VPN2S, Handbook

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How to configure site to site VPN
The multinational corporations have many sites at each country, so if
they want to communicate from HQ to branch under security, the client
to Site VPN is the option they needed.
This scenario uses two units of VPN2S to create an IPSec VPN
connection.
Moreover, both USGs get their public IPs via PPPoE .
HQ WAN IP: 61.231.53.228, LAN IP: 192.168.2.1
Branch WAN IP: 36.226.203.74 LAN IP: 192.168.3.1
Note:
All network IP addresses and subnet masks are used as examples in this article.
Please replace them with your actual network IP addresses and subnet masks.
This example was tested using VPN2S.