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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
Network (HQ)
In the ZyWALL/USG, go to CONFIGURATION >Quick Setup > VPN Setup Wizard,
use the VPN Settings wizard to create a VPN rule that can be used with the
FortiGate. Click Next.
Quick Setup > VPN Setup Wizard > Welcome
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).