Netgear Router WGR614v8 User Manual

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Chapter 5
Fine-Tuning Your Network
This chapter describes how to modify the configuration of the Wireless-G Router Model 
WGR614v8 to allow specific applications to access the Internet or to be accessed from the 
Internet, and how to make adjustments to enhance your network’s performance.
This chapter includes the following sections:
•““Changing the MTU Size” on page 5-20”
•“Configuring Port Forwarding to Local Servers” on page 5-6
•“Configuring Port Triggering” on page 5-9
•“Using...

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How Your Computer Accesses a Remote Computer through Your 
Router
When a computer on your network needs to access a computer on the Internet, your computer 
sends your router a message containing source and destination address and process information. 
Before forwarding your message to the remote computer, your router must modify the source 
information and must create and track the communication session so that...

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4. The Web server at www.example.com composes a return message with the requested Web 
page data. The return message contains the following address and port information:
• The source address is the IP address of www.example.com.
• The source port number is 80, the standard port number for a Web server process.
• The destination address is the public IP address of your router.
• The destination port number is 33333....

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“When you initiate a session with destination port 6667, you must also allow incoming traffic on 
port 113 to reach the originating computer.” Using steps similar to the preceding example, the 
following sequence shows the effects of the port triggering rule you have defined:
1. You open an IRC client program, beginning a chat session on your computer. 
2. Your IRC client composes a request message to an IRC server...

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How Port Forwarding Changes the Communication Process
In both of the preceding examples, your computer initiates an application session with a server 
computer on the Internet. However, you might need to allow a client computer on the Internet to 
initiate a connection to a server computer on your network. Normally, your router ignores any 
inbound traffic that is not a response to your own outbound traffic. You can...

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How Port Forwarding Differs from Port Triggering
The following points summarize the differences between port forwarding and port triggering:
• Port triggering can be used by any computer on your network, although only one computer can 
use it at a time.
• Port forwarding is configured for a single computer on your network.
• Port triggering does not need to know the computer’s IP address in advance. The IP address is...

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To configure port forwarding to a local server:
1.Select Port Forwarding/Port Triggering under Advanced in the main menu.
2.From the Service Name list, 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.In the corresponding Server IP Address box, enter the last digit of the IP address of your local...

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2.Click Add Custom Service.
3.In the Service Name field, enter a descriptive name. 
4.In the Service Type field, select the protocol. If you are unsure, select TCP/UDP.
5.In the Star ting  Po rt field, enter the beginning port number. 
• If the application uses only a single port, enter the same port number in the Ending Port 
field.
• If the application uses a range of ports, enter the ending port number of the...

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To make a local Web server public:
1.Assign your Web server either a fixed IP address or a dynamic IP address using DHCP address 
reservation, as explained in “Using Address Reservation” on page 4-3. In this example, your 
router will always give your Web server an IP address of 192.168.1.33. 
2.In the Port Forwarding screen, configure the router to forward the HTTP service to the local 
address of your Web server at...

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To configure port triggering, you need to know which inbound ports the application needs. Also, 
you need to know the number of the outbound port that will trigger the opening of the inbound 
ports. You can usually determine this information by contacting the publisher of the application or 
user groups or newsgroups.
To set up port triggering: 
1.Select Port Forwarding/Port Triggering under Advanced in the main...