Draytek Vigor2920 Series User Manual page 121

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.
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.
Select an IP address (the selections provided here are set in IP
Alias List of Network >>WAN interface). Local host can use
this IP to connect to Internet.
If you want to choose any one of the Public IP settings, you
must specify some IP addresses in the IP Alias List of the
Static/DHCP Configuration page first. If you did not type in
any IP address in the IP Alias List, the Public IP setting will be
empty in this field. When you click OK, a message will appear
to inform you.
Assign an IP address (e.g., 192.168.1.10) or a subnet to be
compared with the Public IP address for incoming packets.
Select a value of subnet mask for private IP address.
113
Vigor2920 Series User's Guide