HiRO H50212 - Manual (Page 130)

User’s Guide Configuring your Computers
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Nat IP Mapping
Entries in this table allow you to config one IP pool for specified
source IP address from lan, so one packet which's source ip is
in range of the specified address will select one IP address from
pool for NAT.
Configuring Port Trigger
1. From the head Advanced menu, click on NAT -> Nat IP
Mapping. The following page is displayed: