ZyXEL Communications P-660H-TX - Manual (Page 49)

P-660H-Tx v2 Support Notes
could select Full Feature NAT and select an Address Mapping Set with a
Many-to-One Rule. See the following figure.
(2) Internet Access with an Internal Server
In this case, we do exactly as the figure (use the convenient pre-configured
SUA Only set) and also go to Web Configurator, Advanced Setup, Network ->
NAT -> Port Forwarding to specify the Internet Server behind the NAT as
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