Draytek Vigor2120n-plus User Manual page 187

Available settings are explained as follows:
Item
Index
Protocol
Public IP
Private IP
Mask
Status
Click the index number link to open the configuration page.
Available settings are explained as follows:
Item
Enable
Protocol
Description
Indicate the relative number for the particular entry that you
want to configure You should click the appropriate index
number to edit or clear the corresponding entry.
Display the protocol used for this address mapping.
Display the public IP address selected for this entry, e.g.,
172.16.3.102.
Display the private IP set for this address mapping, e.g.,
192.168.1.10.
Display the subnet mask selected for this address mapping.
Display the status for the entry, enable or disable.
Description
Check to enable this entry.
Specify the transport layer protocol. It could be TCP, UDP, or
ALL for selection.
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Vigor2120 Series User's Guide