Draytek vigor2920 series User Manual page 165

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
WAN Interface
WAN IP
Private IP
Subnet Mask
After finishing all the settings here, please click OK to save the configuration.
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.
Choose the WAN interface for such address mapping profile.
This is the source IP of a packet captured on the WAN side and
sent by a NAT host specified in the Private IP field.
The drop down menu contains WAN interface IPs and WAN
IP alias IPs.
This is the source IP of a NAT host which wishes to send
packets to the WAN side and have source address as
configured in the WAN IP field.
Select a value of subnet mask for private IP address.
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Vigor2920 Series User's Guide