NETGEAR RangeMax™ Dual Band Wireless-N Router WNDR3300 Reference Manual

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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

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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

.

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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.

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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

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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