Draytek Vigor 2200V, Руководство пользователя

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NAT Setup
5-6
The inherent security properties of NAT are somewhat bypassed if you
set up DMZ host. You can consider adding additional filter rules or a
secondary firewall.
Click DMZ Host Setup to open the setup page, as shown below. The
DMZ Host setting allows a defined internal user to be exposed to the
Internet in order to use some special purpose applications such as
Netmeeting or Internet Games etc. Each item in the setup page is
described below.
Enable Check to enable the DMZ Host function.
Private IP Enter the private IP address of the DMZ host.
Choose PC Click this button and then a window will automatically pop up,
as depicted below. The window consists of a list of private IP
addresses of all hosts in your LAN network. Select one
private IP address in the list to be the DMZ host.
5.2.3 Open Ports
As Port Redirection (above) but allows you to define a range of ports.
The following screen shows the Open Ports Setup . In the Vigor router,