Draytek Vigor3220 SERIES User Manual page 248

2. After finishing all the settings here, please click OK to save the configuration.
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Translated Type – There are two types for you to choose.
Whole Subnet

 Specific IP Address
Virtual IP Mapping – A pop up dialog will appear for you to
specify the local IP address and the mapping virtual IP
address.
Vigor3220 Series User's Guide