ZyXEL Communications ZyWall ATP series - 8.3 AP Management Screens

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How to Configure Site-to-site IPSec VPN with WatchGuard
This example shows how to use the VPN Setup Wizard to create a site-to-site VPN
between a ZYWALL/USG and a WatchGuard router. The example instructs how to
configure the VPN tunnel between each site. When the VPN tunnel is configured,
each site can be accessed securely.
ZyWALL Site-to-site IPSec VPN with WatchGuard Connected
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 USG310 (Firmware Version: ZLD 4.25) and WatchGuard XTM 515 (Firmware
Version: 11.10.4).