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Page 41 / 68 Scroll up to view Page 36 - 40
RP614v4 Cable/DSL Router Reference Manual
Advanced Configuration of the Router
4-5
v3.0, 2006-03
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.
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.
If port forwarding services are already configured, make a note of the Start Port and the End
Port used by each service.
2.
Click the
Add Custom Service
button.
Figure 4-4
3.
In the Service Name box, type a name.
4.
Enter an unused port number Starting Port box.
Page 42 / 68
RP614v4 Cable/DSL Router Reference Manual
4-6
Advanced Configuration of the Router
v3.0, 2006-03
5.
To forward only one port, enter it again in the Ending Port box. To specify a range of ports,
enter the last port to be forwarded in the Ending Port box, making sure that the range of ports
being forwarded does not overlap with any currently configured services.
6.
Enter the IP address of the local server in the corresponding Server IP Address box.
7.
Click
Apply
at the bottom of the menu.
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.
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 (ports 20 and 21) to local address
192.168.1.33.
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 Game Example
To set up an additional computer to play an Internet game:
1.
Select the game again from the Services/Games list.
Page 43 / 68
RP614v4 Cable/DSL Router Reference Manual
Advanced Configuration of the Router
4-7
v3.0, 2006-03
2.
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.
3.
Type the same port number in the End Port box that you typed in the Start Port box.
4.
Type the IP address of the additional computer in the Server IP Address box.
5.
Click Apply.
Some online games and videoconferencing applications are incompatible with NAT. The RP614v4
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
router to respond to a Ping on the WAN port. These options are discussed below.
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 traffic for services you have not defined, you can have it forwarded to one
computer on your network. This computer is called the Default DMZ Server.
Page 44 / 68
RP614v4 Cable/DSL Router Reference Manual
4-8
Advanced Configuration of the Router
v3.0, 2006-03
If you are willing to risk open access, the WAN Setup menu shown below lets you configure a
Default DMZ Server.
Figure 4-5
To assign a computer or server to be a Default DMZ server, follow these steps:
1.
Click the WAN Setup link on the Advanced section of the main menu.
2.
Check the Default DMZ Server box and type the IP address for that server. To remove the
default DMZ server, uncheck the Default DMZ Server box.
3.
Click
Apply
.
Disabling the SPI Firewall
The SPI (Stateful Packet Inpection) Firewall protects your LAN against Denial of Service
attacks. This should only be disabled in special circumstances.
Responding to 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.
Page 45 / 68
RP614v4 Cable/DSL Router Reference Manual
Advanced Configuration of the Router
4-9
v3.0, 2006-03
Setting the MTU Size
The default MTU size is usually fine. The normal MTU (Maximum Transmit Unit) value for most
Ethernet networks is 1500 Bytes. For some ISPs, particularly some using PPPoE, you may need to
reduce the MTU to 1492. This should not be done unless you are sure it is necessary by your ISP.
Any packets sent through the router that are larger than the configured MTU size will be
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
The second feature 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 4-6

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