Draytek Vigor2500V Manual page 49

As shown above, the Port Redirection Table provides10 port-mapping
entries for internal hosts.
Service Name: Specify the name for the specific network service.
Protocol: Specify the transport layer protocol (TCP or UDP).
Public Port: Specify which port should be redirected to the internal host.
Private IP: Specify the private IP address of the internal host offering the
service.
Private Port: Specify the private port number of the service offered by
Active: Check here to activate the port-mapping entry.
Click OK
Because the router has its own built-in web server for the configuration, if
you want to access to the web configurator remotely and to a web server
behind the router, you need to change the router's http "port" to something
other than the default port 80. You shall change the admin port from the
Management Setup menu and you then access the admin screen by
suffixing the normal IP address of Vigor router's web configurator with 8080.
e.g. http://192.168.1.1:8080
NAT
the internal host.
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