Forwarding Rules - NetComm NB16DG User Manual

Forwarding Rules

The Forwarding Rules page allows you to configure the port forwarding management on the router. Click on any of the menu
items on the left to access the respective settings page.
Forwarding rules are a necessary feature as by default NAT (Network Address Translation) will automatically block incoming traffic
from the Internet to the LAN unless a specific port mapping exists in the NAT translation table. Because of this, NAT provides a
level of protection for computers that are connected to your LAN.
However this also creates a connectivity problem when you want to make LAN resources available to Internet clients. For
example, to play network games or host network applications.
There are three ways to work around NAT and to enable certain LAN resources available from the Internet:
Port Forwarding
Port Triggering
DMZ Host
Port Forwarding
A virtual server is defined as a Service Port, and all requests to this port will be redirected to the computer specified by the Server
IP.
Port Forwarding can also work with Scheduling Rules, and give you more flexibility on Access control.
Note: For further instructions on scheduling rules, please refer to the "Scheduling" section later in this guide
For example, if you have an FTP server (the default port is 21) at 192.168.1.10, a Web server (the default port is 80) at
192.168.20.40, and a VPN server (the default port is 1723) at 192.168.20.60, then you would need to specify the following virtual
server mappings:
Note: At any given time, only one IP address can be bound to a particular Service Port.
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