Draytek Vigor2100V User Manual page 45

In the Vigor routers, we support three variants of port mapping methods: Port
Redirection, Open Ports, and DMZ host.
The following is the setting path for this function.
NAT > Port Redirection
Port Redirection
Open Ports
DMZ host
It should be noticed that, while you are using combinations of these three
systems, there is a priority structure.
conflicts with a rule in another method, then there is strict precedence. This
leads to a predictable result and resolution of rule-conflict. The precedence is
defined as follows.
Port Redirection > Open Ports > DMZ host
Example: If the port number of an incoming packet matches a rule
specified in both Port Redirection and Open Ports, then the packet will be
forwarded to the local address designated in Port Redirection.
NAT Setup
> DMZ Host
> Open Ports
> Well-Known Ports List
The packet is forwarded to a specific local host if the port number
matches that defined in the table. A user can also translate the port to
another port locally.
Similar to the Port Redirection, the Open Ports facility also supports
users to define a range of ports.
This opens up a single host completely. All incoming packets will be
forwarded to the host with the local IP address you designated. The
only exception is packets received in response to outgoing requests
from other local computers or incoming packets which match rules in
the other two methods.
5-2 2
That is, if a rule in one method