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Page 76 / 134 Scroll up to view Page 71 - 75
NETGEAR RangeMax™ Dual Band Wireless-N Router WNDR3300 Reference Manual
5-8
Fine-Tuning Your Network
v1.0, February 2008
2.
Click
Add Custom Service
. The Ports - Custom Services screen displays.
3.
In the
Service Name
field, type a descriptive name.
4.
In the
Service Type
list, select the protocol. If you are unsure, select
TCP/UDP
.
5.
In the
Starting Port
field, type the beginning port number.
•
If the application uses only a single port, type the same port number in the
Ending Port
field.
•
If the application uses a range of ports, type the ending port number of the range in the
Ending Port
field.
6.
In the
Server IP Address
field, type the IP address of your local computer that will provide
this service.
7.
Click
Apply
. The service appears in the list in the Port Forwarding/Port Triggering screen.
Editing or Deleting a Port Forwarding Entry
To edit or delete a port forwarding entry:
1.
In the table, select the radio button next to the service name.
2.
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.
Figure 5-2
Page 77 / 134
NETGEAR RangeMax™ Dual Band Wireless-N Router WNDR3300 Reference Manual
Fine-Tuning Your Network
5-9
v1.0, February 2008
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, as explained in
“Using Address Reservation” on page 4-4
. In this example, your
router always gives your Web server an IP address of 192.168.1.33.
2.
Configure the Port Forwarding screen 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 as described in
“Using a Dynamic DNS Service” on page 4-5
.
To access your Web server from the Internet, a remote user must 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.
Configuring 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 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.
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
“Using Universal Plug and Play” on page 5-12
.
Page 78 / 134
NETGEAR RangeMax™ Dual Band Wireless-N Router WNDR3300 Reference Manual
5-10
Fine-Tuning Your Network
v1.0, February 2008
To configure port triggering, you need to know which inbound ports the application needs. Also,
you need to know the outbound port number that will trigger the opening of the inbound 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
Port Forwarding/Port Triggering
under Advanced in the main menu. The
Forwarding/Port Triggering screen displays.
2.
Select the
Port Triggering
radio button. The port triggering information displays.
3.
Clear the
Disable Port Triggering
check box.
Figure 5-3
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.
Page 79 / 134
NETGEAR RangeMax™ Dual Band Wireless-N Router WNDR3300 Reference Manual
Fine-Tuning Your Network
5-11
v1.0, February 2008
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 timer expires. This is required because the router cannot be sure when the
application has terminated.
5.
Click
Add Service
.
6.
In the
Service Name
field, type a descriptive service name.
7.
In the
Service User
list, select
Any
(the default) to allow this service to be used by any
computer on the Internet. Otherwise, select
Single address
, and enter the IP address of one
computer to restrict the service to a particular computer.
8.
Select the service type, either
TCP
or
UDP
or both (
TCP/UDP
). If you are not sure, select
TCP/UDP.
9.
In the
Triggering Port
field, enter the number of the outbound traffic port that will cause the
inbound ports to be opened.
10.
Enter the inbound connection port information in the
Connection Type
,
Starting Port
, and
Ending Port
fields.
11.
Click
Apply
. The service appears in the Port Triggering Portmap table.
Figure 5-4
Page 80 / 134
NETGEAR RangeMax™ Dual Band Wireless-N Router WNDR3300 Reference Manual
5-12
Fine-Tuning Your Network
v1.0, February 2008
Using Universal Plug and Play
Universal Plug and Play (UPnP) helps devices, such as Internet appliances and computers, to
access the network and connect to other devices as needed. UPnP devices can automatically
discover the services from other registered UPnP devices on the network.
To turn on Universal Plug and Play:
1.
From the main menu of the browser interface, under Advanced, click
UPnP
. The UPnP screen
displays.
2.
The available settings and information in this screen are:
•
Turn UPnP On
.
UPnP can be enabled or disabled for automatic device configuration. The
default setting for UPnP is disabled. If this check box is not selected, the router does not
allow any device to automatically control the resources, such as port forwarding
(mapping) of the router.
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 enable UPnP.
Figure 5-5

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