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7.

Click the

Add Custom Service

button.

8.

In the

Name

field, enter a descriptive name.

9.

In the

Type

field, select the protocol.

If you are unsure, select

TCP/UDP

.

10.

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

Finish Port

field.

11.

Type the IP address in the

Internal IP address

field or select the radio button for an

attached device listed in the table.

12.

Click the

Apply

button.

The service is now in the list on the Port Forwarding/Port Triggering screen.

Edit a Port Forwarding Service



To edit a port forwarding entry:

1.

Launch a web browser from a computer or wireless device that is connected to the

network.

2.

Type

http://routerlogin.net

or

www.routerlogin.com

.

A login screen displays.

3.

Enter the gateway user name and password.

The user name is

admin

. The default password is

password

. The user name and

password are case-sensitive.

The BASIC Home screen displays.

4.

Select

Advanced > Advanced Setup > Port Forwarding/Port Triggering

.

The Port Forwarding/Port Triggering screen displays.

5.

Leave the

Port Forwarding

radio button selected as the service type.

6.

In the table, select the radio button next to the service name.

7.

Click the

Edit Service

button.

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The Ports - Custom Services screen displays.

8.

Specify changes as needed.

9.

Click the

Apply

button.

Your changes are saved.

Delete a Port Forwarding Entry



To delete a port forwarding entry:

1.

Launch a web browser from a computer or wireless device that is connected to the

network.

2.

Type

http://routerlogin.net

or

www.routerlogin.com

.

A login screen displays.

3.

Enter the gateway user name and password.

The user name is

admin

. The default password is

password

. The user name and

password are case-sensitive.

The BASIC Home screen displays.

4.

Select

Advanced > Advanced Setup > Port Forwarding/Port Triggering

.

The Port Forwarding/Port Triggering screen displays.

5.

Select the

Port Forwarding

radio button as the service type.

6.

In the table, select the radio button next to the service name.

7.

Click the

Delete Service

button.

The service is deleted.

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 gateway always gives your web server an IP address of

192.168.0.33.

2.

In the Port Forwarding/Port Triggering screen, configure the gateway to forward the HTTP

service to the local address of your web server at

192.168.0.33

.

HTTP (port 80) is the standard protocol for web servers.

3.

(Optional) Register a host name with a Dynamic DNS service and specify that name in the

Dynamic DNS screen of the gateway.

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For more information, see

Dynamic DNS

on page

85.

Dynamic DNS makes it much easier to access a server from the Internet because you

can type the name in the Internet browser. Otherwise, you must know the IP address that

the Internet service provider assigned, which typically changes.

How the Gateway Implements the Port Forwarding Rule

The following sequence shows the effects of a port forwarding rule:

1.

When you type the URL www.example.com in your browser, the browser sends a web

page request message with the following destination information:

•

Destination address

. The IP address of www.example.com, which is the address of

your gateway.

•

Destination port number

. 80, which is the standard port number for a web server

process.

2.

Your gateway receives the message and finds your port forwarding rule for incoming port 80

traffic.

3.

The gateway changes the destination in the message to IP address 192.168.0.223 and

sends the message to that computer.

4.

Your web server at IP address 192.168.0.223 receives the request and sends a reply

message to your gateway.

5.

Your gateway performs Network Address Translation (NAT) on the source IP address and

sends the reply through the Internet to the computer or wireless device that sent the web

page request.

Port Triggering

Port triggering is a dynamic extension of port forwarding that is useful in these cases:

•

An application uses port forwarding to more than one local computer (but not

simultaneously).

•

An application opens incoming ports that are different from the outgoing port.

With port triggering, the gateway monitors traffic to the Internet from an outbound “trigger”

port that you specify. For outbound traffic from that port, the gateway saves the IP address of

the computer that sent the traffic. The gateway temporarily opens the incoming port or ports

that you specify in your rule, and forwards that incoming traffic to that destination.

Port forwarding creates a static mapping of a port number or range of ports to a single local

computer. Port triggering can dynamically open ports to any computer when needed and

close the ports when they are no longer needed.

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Note:

If you enabled port triggering because 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), enable Universal Plug and Play (UPnP). See

Improve Network Connections with Universal Plug and Play

on

page

91.

Add a Port Triggering Service



To add a port triggering service:

1.

Launch a web browser from a computer or wireless device that is connected to the

network.

2.

Type

http://routerlogin.net

or

www.routerlogin.com

.

A login screen displays.

3.

Enter the gateway user name and password.

The user name is

admin

. The default password is

password

. The user name and

password are case-sensitive.

The BASIC Home screen displays.

4.

Select

Advanced > Advanced Setup > Port Forwarding/Port Triggering

.

The Port Forwarding/Port Triggering screen displays.

5.

Select the

Port Triggering

radio button.

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6.

Click the

Add Service

button.

7.

In the

Service Name

field, type a descriptive service name.

8.

From the

Service User

list, select a user option:

•

Any

(the default) allows any computer on the Internet to use this service.

•

Single address

restricts the service to a particular computer. You must enter the IP

address of the computer to which you want to grant access.

9.

From the

Service Type

list, select a service.

If you are not sure, select

TCP/UDP

.

10.

In the

Triggering Port

field, enter the number of the outbound traffic port that will open the

inbound ports.

11.

In the

Connection Type

,

Starting Port

, and

Ending Port

fields, enter the inbound

connection port information.

12.

Click the

Apply

button.

The service is added. You must enable port triggering before the gateway uses port

triggering. For information about port triggering, see

Set the Port Triggering Timeout

on

page

50.

Set the Port Triggering Timeout



To enable port triggering:

1.

Launch a web browser from a computer or wireless device that is connected to the

network.

2.

Type

http://routerlogin.net

or

www.routerlogin.com

.

A login screen displays.

3.

Enter the gateway user name and password.

The user name is

admin

. The default password is

password

. The user name and

password are case-sensitive.

The BASIC Home screen displays.