NETGEAR RangeMax™ NEXT Wireless Router WNR834M Reference Manual

Advanced Configuration of the Router

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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

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.

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

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.

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