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NETGEAR RangeMax™ NEXT Wireless Router WNR834M Reference Manual
Advanced Configuration of the Router
6-9
v1.3, May 2006
2.
From the Service Name box, select the service or game that you will host on your network.
If the service does not appear in the list, see the following section,
Adding a Custom Service
.
3.
Enter the IP address of the local server in the corresponding Server IP Address box.
4.
Click the
Add
button.
Adding a Custom Service
To define a service, game or application that does not appear in the Service Name list, you must
determine what port numbers the service will use. 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.
Select
Port Forwarding / Port Triggering
from the Advanced Section of the main menu, as
described in the preceding section.
2.
Click the
Add Custom Service
button.
3.
Type the service name in the Service Name box.
4.
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.
5.
Type the IP address of the computer in the Server IP Address box.
6.
Click
Apply
to save your changes.
Figure 6-7
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NETGEAR RangeMax™ NEXT Wireless Router WNR834M Reference Manual
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Advanced Configuration of the Router
v1.3, May 2006
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 the
Edit Service
or
Delete Service
button.
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 Router 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 Internet Gaming
To set up an additional computer to play Age of Empire 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 list and add +1 for each additional
computer. For example, if you have 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.
Page 63 / 92
NETGEAR RangeMax™ NEXT Wireless Router WNR834M Reference Manual
Advanced Configuration of the Router
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v1.3, May 2006
5.
Type the IP address of the additional computer in the Server IP Address box.
6.
Click
Apply
.
Some online games and videoconferencing applications are incompatible with NAT. The
WNR834M 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 Port Forwarding / Port Triggering 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.
Connecting 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 some regions of 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 timeouts.
Figure 6-8
Page 64 / 92
NETGEAR RangeMax™ NEXT Wireless Router WNR834M Reference Manual
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Advanced Configuration of the Router
v1.3, May 2006
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 Port
Forwarding / Port Triggering 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 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 in 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 a Ping on the 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. Do not 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.
Page 65 / 92
NETGEAR RangeMax™ NEXT Wireless Router WNR834M Reference Manual
Advanced Configuration of the Router
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v1.3, May 2006
Setting the MTU Size
The normal MTU (Maximum Transmit Unit) value for most Ethernet networks is 1500 Bytes,
1492 Bytes for PPPoE connections, or 1436 for PPTP connections. For some ISPs you may need to
reduce the MTU. But this is rarely required, and should not be done unless you are sure it is
necessary for your ISP connection.
Any packets sent through the router that are larger than the configured MTU size are repackaged
into smaller packets to meet the MTU requirement. To change the MTU size:
1.
Under MTU Size, enter a new size between 64 and 1500.
2.
Click
Apply
to save the new configuration.
Using the LAN IP Setup Options
Another category under the Advanced heading is LAN IP Setup. This menu allows configuration
of LAN IP services such as DHCP and RIP. From the main menu of the browser interface, under
Advanced, click on
LAN IP Setup
to view the LAN IP Setup menu, shown below.
Figure 6-9

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