ZyXEL Communications P-660HW-TX - Manual (Page 59)

P-660HW-Tx v2 Series Support Notes
In our Internet Access example, we only need one rule where all our ILAs map
to one IGA assigned by the ISP. You can just use the default SUA NAT, or you
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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