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Page 91 / 143 Scroll up to view Page 86 - 90
Advanced Settings
91
N450 Wireless Router WNR2500
A screen similar to the following displays:
By default, Port Forwarding is selected as the service type.
2.
From the Service Name list, select the service or game that you are hosting on your
network.
If the service does not display in the list, see
Add a Custom Service
on page
91.
3.
In the corresponding Server IP Address field, enter the last octet of the IP address of your
local computer that provides this service.
4.
Click the
Add
button.
The service is added to the table onscreen.
Add a Custom Service
To define a service, game, or application that does not display in the Service Name list, you
must first find out which port number or range of numbers the application uses. You can
usually find this information by contacting the publisher of the application or user groups or
newsgroups.
To add a custom service:
1.
Select
Advanced Setup > Port Forwarding / Port Triggering
.
The Port Forwarding / Port Triggering screen displays. By default, Port Forwarding is
selected as the service type.
2.
Click the
Add Custom Service
button.
Page 92 / 143
Advanced Settings
92
N450 Wireless Router WNR2500
A screen similar to the following displays:
3.
In the Service Name field, enter a descriptive name.
4.
In the Protocol list, select the protocol. Select
TCP
,
UDP
, or
TCP/UDP
.
If you are not sure, select
TCP/UDP
.
5.
In the External Starting Port field, enter the beginning port number.
•
If the application uses a single port, enter the same port number in the External
Ending Port field.
•
If the application uses a range of ports, enter the ending port number of the range in
the External Ending Port field.
6.
If the internal port numbers are the same as the external port numbers, select the
Use the
same port range for Internal port
check box.
If they are not, use the Internal Starting Port and Internal Ending Port fields to enter the
port numbers.
7.
In the Internal IP Address field, enter the IP address of your local computer that provides this
service.
You can also select a radio button for one of the devices in the list of attached devices to
automatically place the IP address of the selected device in the Internal IP Address field.
8.
Click the
Apply
button.
The service is added to the table on the Port Forwarding / Port Triggering screen.
Page 93 / 143
Advanced Settings
93
N450 Wireless Router WNR2500
Edit or Delete a Port Forwarding Entry
To edit or delete a port forwarding entry:
1.
Select
ADVANCED > Advanced Setup > Port Forwarding / Port Triggering
.
The Port Forwarding / Port Triggering screen displays.
2.
In the table, select the radio button next to the service that you want to edit or delete.
3.
To edit the service, click the
Edit Service
button.
The Ports - Custom Services screen displays.
a.
Edit the service.
b.
Click the
Apply
button.
4.
To delete the service, click the
Delete Service
button.
The service is removed from the table.
Application Example: Make 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 router always gives your web server an IP address of 192.168.1.33.
2.
On the Port Forwarding / Port Triggering screen, configure the 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 router to
use the name.
For more information, see
Dynamic DNS
on page
97. To access your web server from the
Internet, a remote user must know the IP address that your ISP has assigned. 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 must open incoming ports that are different from the outgoing port.
Page 94 / 143
Advanced Settings
94
N450 Wireless Router WNR2500
When port triggering is enabled, the router monitors outbound traffic looking for a specified
outbound trigger port. When the router detects outbound traffic on that port, it remembers the
IP address of the local computer that sent the data. The router then temporarily opens the
specified incoming port or ports, and forwards incoming traffic on the triggered ports to the
triggering computer.
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, enable Universal Plug and Play (UPnP). See
Universal Plug and Play
on page
102.
To set up port triggering, you must know which inbound ports the application needs. Also, you
must know the number of the outbound port that triggers the opening of the inbound ports.
You can usually find 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
.
The Port Forwarding / Port Triggering screen displays.
2.
Select the
Port Triggering
radio button.
Page 95 / 143
Advanced Settings
95
N450 Wireless Router WNR2500
The screen adjusts 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 router is retained even though it is
not used.
4.
In the Port Triggering Time-out field, enter a value up to 9999 minutes.
The default value is 20 minutes. This value controls the inactivity timer for the designated
inbound ports. The inbound ports close when the inactivity time expires because the
router cannot detect when the application has terminated.
5.
Click the
Add Service
button.

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