54 Mbps Wireless Router WGR614v7 Reference Manual

6-4

Advanced Configuration of the Router

April 2006

interface, under Advanced, click on Port Forwarding to view the port forwarding menu, shown

below.

Figure 6-3:

Port Forwarding Menu

Use the Port Forwarding menu to configure the router to forward 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. The DMZ Server is

configured in the WAN Setup menu as discussed in

“Configuring the WAN Setup Options“ on

page 6-7

.

Before starting, you'll need to determine which type of service, application or game you'll provide

and the IP address of the computer that will provide each service. Be sure the computer’s IP

address never changes. To configure port forwarding to a local server:

1.

From the Service & Game box, select the service or game that you will host on your network.

If the service does not appear in the list, refer to the following section, “

Adding a Custom

Service

”.

2.

Enter the IP address of the local server in the corresponding Server IP Address box.

3.

Click the Add button.

Note:

To assure that the same computer always has the same IP address, use the reserved

IP address feature of your wireless router. See

“Using Address Reservation“ on page

6-12

for instructions on how to use reserved IP addresses.

54 Mbps Wireless Router WGR614v7 Reference Manual

Advanced Configuration of the Router

6-5

April 2006

Adding a Custom Service

To define a service, game or application that does not appear in the Services & Games list, you

must determine what port numbers are used by the service. For this information, you may need to

contact the manufacturer of the program that you wish to use. When you have the port number

information, follow these steps:

1.

Click the Add Custom Service button.

Figure 6-4:

Ports - Custom Services Menu

2.

Type the service name in the Service Name box.

3.

Type the beginning port number in the Starting Port box.

•

If the application uses only a single port; type the same port number in the Ending Port

box.

•

If the application uses a range of ports; type the ending port number of the range in the

Ending Port box.

4.

Type the IP address of the computer in the Server IP Address box.

5.

Click

Apply

to save your changes.

Editing or Deleting a Port Forwarding Entry

To edit or delete a Port Forwarding entry, follow these steps.

1.

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

2.

Click Edit or Delete.

54 Mbps Wireless Router WGR614v7 Reference Manual

6-6

Advanced Configuration of the Router

April 2006

Local Web and FTP Server Example

If a local computer with a private IP address of 192.168.1.33 acts as a Web and FTP server,

configure the Ports menu to forward HTTP (port 80) and FTP (port 21) to local address

192.168.1.33

In order for a remote user to access this server from the Internet, the remote user must know the IP

address that has been assigned by your ISP. If this address is 172.16.1.23, for example, an Internet

user can access your Web server by directing the browser to http://172.16.1.23. The assigned IP

address can be found in the Maintenance Status Menu, where it is shown as the WAN IP Address.

Some considerations for this application are:

•

If your account’s IP address is assigned dynamically by your ISP, the IP address may change

periodically as the DHCP lease expires.

•

If the IP address of the local computer is assigned by DHCP, it may change when the computer

is rebooted. To avoid this, you can manually configure the computer to use a fixed address.

•

Local computers must access the local server using the computers’ local LAN address

(192.168.1.33 in this example). Attempts by local computers to access the server using the

external IP address (172.16.1.23 in this example) will fail.

Multiple Computers for Half Life, KALI or Quake III Example

To set up an additional computer to play Half Life, KALI or Quake III:

1.

Click the button of an unused port in the table.

2.

Select the game again from the Services/Games list.

3.

Change the beginning port number in the Start Port box.

For these games, use the supplied number in the default listing and add +1 for each additional

computer. For example, if you've already configured one computer to play Hexen II (using

port 26900), the second computer's port number would be 26901, and the third computer

would be 26902.

4.

Type the same port number in the End Port box that you typed in the Start Port box.

5.

Type the IP address of the additional computer in the Server IP Address box.

6.

Click Apply.

54 Mbps Wireless Router WGR614v7 Reference Manual

Advanced Configuration of the Router

6-7

April 2006

Some online games and videoconferencing applications are incompatible with NAT. The wireless

router is programmed to recognize some of these applications and to work properly with them, but

there are other applications that may not function well. In some cases, one local computer can run

the application properly if that computer’s IP address is entered as the default in the PORTS Menu.

If one local computer acts as a game or videoconferencing host, enter its IP address as the default.

Configuring the WAN Setup Options

The WAN Setup options let you configure a DMZ server, change the MTU size and enable the

wireless router to respond to a Ping on the WAN port. These options are discussed below.

Figure 6-5:

WAN Setup menu.

Connect Automatically, as Required

Normally, this option should be checked to enable it. An Internet connection will be made

automatically after each timeout, whenever Internet-bound traffic is detected. This provides

connection on demand and is potentially cost-saving in places in Europe for example where

Internet services charge by the minute.

If disabled, you must connect manually, using the “Connection Status” button on the Router Status

screen. This manual connection will stay up all the time without time outs.

54 Mbps Wireless Router WGR614v7 Reference Manual

6-8

Advanced Configuration of the Router

April 2006

Disabling the SPI Firewall

The SPI (Stateful Packet Inspection) Firewall protects your LAN against Denial of Service attacks.

This should only be disabled in special circumstances.

Setting Up a Default DMZ Server

The default DMZ server feature is helpful when using some online games and videoconferencing

applications that are incompatible with NAT. The router is programmed to recognize some of these

applications and to work properly with them, but there are other applications that may not function

well. In some cases, one local computer can run the application properly if that computer’s IP

address is entered as the default DMZ server.

Incoming traffic from the Internet is normally discarded by the router unless the traffic is a

response to one of your local computers or a service that you have configured in the Ports menu.

Instead of discarding this traffic, you can have it forwarded to one computer on your network. This

computer is called the Default DMZ Server.

The WAN Setup menu, shown below lets you configure a Default DMZ Server.

To assign a computer or server to be a Default DMZ server, follow these steps:

1.

Click WAN Setup link on the Advanced section of the main menu.

2.

Type the IP address for that server. To remove the default DMZ server, replace the IP address

numbers with all zeros.

3.

Click Apply.

Responding to Ping on Internet WAN Port

If you want the router to respond to a 'ping' from the Internet, click the ‘Respond to Ping on

Internet WAN Port’ check box. This should only be used as a diagnostic tool, since it allows your

router to be discovered. Don't check this box unless you have a specific reason to do so.

Note:

DMZ servers pose a security risk. A computer designated as the default DMZ

server loses much of the protection of the firewall, and is exposed to exploits from the

Internet. If compromised, the DMZ server can be used to attack your network.