Draytek Vigor 2820 User Manual page 67

Enable
Mode
Service Name
Protocol
WAN IP
Public Port
Private IP
Private Port
Active
Note that the router has its own built-in services (servers) such as Telnet, HTTP and FTP etc.
Since the common port numbers of these services (servers) are all the same, you may need to
reset the router in order to avoid confliction.
For example, the built-in web configurator in the router is with default port 80, which may
conflict with the web server in the local network, http://192.168.1.13:80. Therefore, you need
to change the router's http port to any one other than the default port 80 to avoid
Vigor2820 Series User's Guide
Check this box to enable such port redirection setting.
Two options (Single and Range) are provided here for you to
choose. To set a range for the specific service, select Range. In
Range mode, if the public port (start port and end port) and the
starting IP of private IP had been entered, the system will calculate
and display the ending IP of private IP automatically.
Enter the description of the specific network service.
Select the transport layer protocol (TCP or UDP).
Select the WAN IP used for port redirection. There are eight WAN
IP alias that can be selected and used for port redirection. The
default setting is All which means all the incoming data from any
port will be redirected to specified range of IP address and port.
Specify which port can be redirected to the specified Private IP
and Port of the internal host. If you choose Range as the port
redirection mode, you will see two boxes on this field. Simply type
the required number on the first box. The second one will be
assigned automatically later.
Specify the private IP address of the internal host providing the
service. If you choose Range as the port redirection mode, you will
see two boxes on this field. Type a complete IP address in the first
box (as the starting point) and the fourth digits in the second box
(as the end point).
Specify the private port number of the service offered by the
internal host.
Check this box to activate the port-mapping entry you have
defined.
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