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Page 76 / 172 Scroll up to view Page 71 - 75
Reference Manual for the 54 Mbps Wireless Router WGR614 v5
7-4
Advanced Configuration of the Router
July 2004 202-10036-01
interface, under Advanced, click on Port Forwarding to view the port forwarding menu, shown
below.
Figure 7-3:
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 7-7
.
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 WGR614 v5 router. See
“Using Address Reservation“ on page
7-12
for instructions on how to use reserved IP addresses.
Page 77 / 172
Reference Manual for the 54 Mbps Wireless Router WGR614 v5
Advanced Configuration of the Router
7-5
July 2004 202-10036-01
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 7-4:
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.
Page 78 / 172
Reference Manual for the 54 Mbps Wireless Router WGR614 v5
7-6
Advanced Configuration of the Router
July 2004 202-10036-01
2.
Click Edit or Delete.
Local Web and FTP Server Example
If a local computer with a private IP address of 192.168.0.33 acts as a Web and FTP server,
configure the Ports menu to forward HTTP (port 80) and FTP (port 21) to local address
192.168.0.33
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
(192.168.0.33 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.
Page 79 / 172
Reference Manual for the 54 Mbps Wireless Router WGR614 v5
Advanced Configuration of the Router
7-7
July 2004 202-10036-01
Some online games and videoconferencing applications are incompatible with NAT. The WGR614
v5 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 7-5:
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.
Page 80 / 172
Reference Manual for the 54 Mbps Wireless Router WGR614 v5
7-8
Advanced Configuration of the Router
July 2004 202-10036-01
Disabling the SPI Firewall
The SPI (Stateful 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.

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