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D6300 WiFi DSL Modem Router
Therefore, your WiFi modem router modifies the destination information in the request
message:
The destination address is replaced with 192.168.1.123.
Your WiFi modem router then sends this request message to your local network.
3.
Your web server at 192.168.1.123 receives the request and composes a return message
with the requested web page data. Your web server then sends this reply message to your
WiFi modem router.
4.
Your WiFi modem router performs Network Address Translation (NAT) on the source IP
address, and sends this request message through the Internet to the remote computer,
which displays the web page from www.example.com.
To configure port forwarding, you need to know which inbound ports the application needs.
Usually you can determine this information by contacting the publisher of the application or
the relevant user groups and newsgroups.
How Port Forwarding Differs from Port Triggering
The following points summarize the differences between port forwarding and port triggering:
Port triggering can be used by any computer on your network, although only one
computer can use it at a time.
Port forwarding is configured for a single computer on your network.
Port triggering requires that you know the computer’s IP address in advance. The IP
address is captured automatically.
Port forwarding requires that you specify the computer’s IP address during configuration,
and the IP address can never change.
Port triggering requires specific outbound traffic to open the inbound ports, and the
triggered ports are closed after a period of no activity.
Port forwarding is always active and does not need to be triggered.
Set Up Port Forwarding to Local Servers
Using the port forwarding feature, you can allow certain types of incoming traffic to reach
servers on your local network. For example, you might want to make a local web server, FTP
server, or game server visible and available to the Internet.
Use the Port Forwarding/Port Triggering screen to configure the WiFi modem router to
forward specific incoming protocols to computers on your local network. In addition to servers
for specific applications, you can also specify a default DMZ server to which all other
incoming protocols are forwarded.
Before starting, you need to determine which type of service, application, or game you want
to provide, and the local IP address of the computer that provides the service. The server
computer has to always have the same IP address.
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To set up port forwarding:
Tip:
To ensure that your server computer always has the same IP address,
use the reserved IP address feature of your WiFi DSL Modem Router.
1.
Select
ADVANCED > Advanced Setup > Port Forwarding/Port Triggering
to display
the following screen:
Port Forwarding is selected as the service type.
2.
Click
Add
to display the following screen:
3.
From the Service list, select the service or game that you host on your network. If the
service does not appear in the list, see
Add a Custom Service
on page 108.
4.
From the Action list, select the action that you want.
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5.
In the Send to LAN Server field, enter the last digit of the IP address of your local computer
that provides this service.
6.
Click
Apply
. The service appears in the list in the screen.
Add a Custom Service
To define a service, game, or application that does not appear in the Service Name list, you
have to first determine which port number or range of numbers is used by the application.
You can usually determine this information by contacting the publisher of the application or
user groups or newsgroups.
To add a custom service:
1.
Select
ADVANCED > Advanced Setup > Port Forwarding/Port Triggering
.
2.
Select
Port Forwarding
as the service type.
3.
Click the
Add Custom Service
button to display the following screen:
4.
In the Name field, enter a descriptive name.
5.
In the Type list, select the protocol. If you are unsure, select
TCP/UDP
.
6.
In the Start Port field, enter the beginning port number.
If the application uses a single port, enter the same port number in the End Port field.
If the application uses a range of ports, enter the ending port number of the range in
the End Port field.
7.
Click
Apply
. The service appears in the list in the Port Forwarding/Port Triggering screen.
Edit or Delete a Port Forwarding Entry
To edit or delete a port forwarding entry:
1.
Select
ADVANCED > Advanced Setup > Port Forwarding/Port Triggering
.
2.
In the table, select the radio button next to the service name.
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3.
Click
Edit Service
or
Delete Service
.
Application Example: Making a Local Web Server Public
If you host a web server on your local network, you can use port forwarding to allow web
requests from anyone on the Internet to reach your web server.
To make a local web server public:
1.
Assign your web server either a fixed IP address or a dynamic IP address using DHCP
address reservation. In this example, your WiFi modem router always gives your web
server an IP address of 192.168.1.33.
2.
In the Port Forwarding/Port Triggering screen, configure the WiFi modem router to forward
the HTTP service to the local address of your web server at
192.168.1.33
. HTTP (port 80) is
the standard protocol for web servers.
3.
(Optional) Register a host name with a Dynamic DNS service, and configure your WiFi
modem router to use the name as described in
Dynamic DNS
on page 111. To access your
web server from the Internet, a remote user has to know the IP address that has been
assigned by your ISP. However, if you use a Dynamic DNS service, the remote user can
reach your server by a user-friendly Internet name, such as mynetgear.dyndns.org.
Set Up Port Triggering
Port triggering is a dynamic extension of port forwarding that is useful in these cases:
More than one local computer needs port forwarding for the same application (but not
simultaneously).
An application needs to open incoming ports that are different from the outgoing port.
When port triggering is enabled, the WiFi modem router monitors outbound traffic looking for
a specified outbound “trigger” port. When the WiFi modem router detects outbound traffic on
that port, it remembers the IP address of the local computer that sent the data. The WiFi
modem router then temporarily opens the specified incoming port or ports, and forwards
incoming traffic on the triggered ports to the triggering computer.
While port forwarding creates a static mapping of a port number or range to a single local
computer, port triggering can dynamically open ports to any computer that needs them and
can close the ports when they are no longer needed.
Note:
If you use applications such as multiplayer gaming, peer-to-peer
connections, real-time communications such as instant messaging,
or remote assistance (a feature in Windows XP), you should also
enable Universal Plug and Play (UPnP) according to the instructions
in
Universal Plug and Play
on page 116.
To set up port triggering, you need to know which inbound ports the application needs. Also,
you need to know the number of the outbound port that triggers the opening of the inbound
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ports. You can usually determine this information by contacting the publisher of the
application or user groups or newsgroups.
To set up port triggering:
1.
Select
ADVANCED > Advanced Setup > Port Forwarding/Port Triggering
.
2.
Select the
Port Triggering
radio button to display the port triggering information.
3.
Clear the
Disable Port Triggering
check box if it is selected.
Note:
If the Disable Port Triggering check box is selected after you configure
port triggering, port triggering is disabled. However, any port triggering
configuration information you added to the WiFi modem router is retained even
though it is not used.
4.
In the Port Triggering Timeout field, enter a value up to 9999 minutes.
This value controls the inactivity timer for the designated inbound ports. The inbound
ports close when the inactivity time expires. This closure is required because the WiFi
modem router cannot be sure when the application has terminated.

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