Draytek Vigor2100 Series User Manual page 43

Service Name
Protocol
Public Port
Private IP
Private Port
Active
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 Setup
Specify the name for the specific network service.
Specify the transport layer protocol (TCP or UDP).
Specify which port should be redirected to the internal
host.
Specify the private IP address of the internal host
offering the service.
Specify the private port number of the service offered
by the internal host.
Check here to activate the port-mapping entry.
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