ZyXEL Communications VPN Series Handbook page 672

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).
Set Up the NAT on the ZyWALL/USG
In the ZyWALL/USG, go to CONFIGURATION > Network > NAT > add NAT, select
Enable Rule. Select 1:1 NAT. Set Incoming Interface to be the wan1 interface.
Type User-Defined Original IP (172.251.31.90 in this example) and type User-
Defined Mapped IP (192.168.1.34 in this example). Set Port Mapping Type to
Service, set Original Service and Mapped Service to HTTP in this example. Click
OK.
CONFIGURATION > Network > NAT > add NAT
www.zyxel.com
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