ZyXEL Communications ZyWall ATP series - How to Configure Ipsec Site to Site VPN While One Site Is Behind a NAT Router; Set up the Zywall;Usg Ipsec VPN Tunnel of Corporate Network (HQ)

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How to Configure IPSec Site to Site VPN while one Site is
behind a NAT router
This example shows how to use the VPN Setup Wizard to create a IPSec Site to
Site VPN tunnel between ZyWALL/USG devices. The example instructs how to
configure the VPN tunnel between each site while one Site is behind a NAT
router. When the IPSec Site to Site VPN tunnel is configured, each site can be
accessed securely.
ZyWALL/USG Site to Site VPN while one Site is behind a NAT router
Set Up the ZyWALL/USG IPSec VPN Tunnel of Corporate
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 USG110 (Firmware Version: ZLD 4.25) and
ZyWALL 310 (Firmware Version: ZLD 4.25).