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Charter WiFi Netgear WNDR3800/4300 Port Forwarding

Netgear WNDR3800 and 4300

Using the port forwarding feature, you can allow certain types of incoming traffic to reach your local network. For example, you might need to open ports for online gaming connections or voice communication.

Note: Port Forwarding can expose devices on your network to the Internet. If you DO NOT NEED to port forward, Charter recommends NOT to.  Charter is not responsible for any risks that arise if you choose to use Port Forwarding.

 
 

General

What is Port Forwarding?

Port forwarding allows remote computers (for example, computers on the Internet) to connect to a specific computer or service within a private local-area network (Your home network).

Computers in your home network obtain Internet access through your cable modem connected to a router. Your Router is configured with a public IP address for communicating with the internet as well as a private IP address for communicating with devices in your home. Your computers and other internet connected devices behind the router communicate only with a private IP address issued by your router.

People use port forwarding for a variety of reasons. The most common reasons port forwarding is used are:

  • Gaming Systems (PS3, Xbox 360, Wii, etc…)
  • Game Servers
  • Web Cams
  • Voice Over IP (VOIP) Devices
  • Web Server
  • FTP Server

When your router assigns IP addresses to the computers and devices in your home it is acting as a Dynamic Host Configuration Protocol (DHCP) server.

normal operation

Normally, your router ignores any inbound traffic that is not a response to your own outbound traffic.

ignore inbound traffic

Using the port forwarding feature of your router, you can allow certain types of incoming traffic to reach devices in your home network.

allow some inbound traffic

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Router Login

  1. Launch a browser from a computer or wireless device that is connected to the router
  2. In the address bar type routerlogin.net or routerlogin.com and press Enter

routerlogin.net

The login window displays:

login window

  1. Enter your user name and password. Note: The user name and password is case sensitive

The default user name is: admin
The default password is: password

  1. Click the OK button

You will be taken to the router’s Home Screen

router home screen

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Setup

Address Reservations

When you specify a reserved IP address for a computer on the LAN, that computer receives the same IP address each time it accesses the router’s Dynamic Host Configuration Protocol (DHCP) server. Assign reserved IP addresses to servers that require permanent IP settings.

  1. Log in to the router. Click here for instructions
  2. Click on the Advanced tab
  3. Click Setup
  4. Click LAN Setup
  5. Click the Add Button

Advanced tab

  1. In the IP Address field, type the IP address to assign to the computer or server. (Choose an IP address from the router’s LAN subnet, such as 192.168.1.5)
  2. Type the MAC address of the computer or server.

Note: If the computer is already connected to your network, you can click the radio button next it to copy the MAC address information into the text boxes. 

Address reservation

  1. Click the Add button

The device will be added to the Address Reservation Table

Note: The reserved address is not assigned until the next time the computer contacts the router’s DHCP server. Reboot the computer to force a DHCP release and renew and the device will be assigned the designated IP address.

Address reservation

To edit or delete a reserved address entry, select the radio button of the device you want to edit or delete. Then click Edit or Delete.

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Port Forwarding

Use the Port Forwarding screen to configure the router to forward specific 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 server computer has to always have the same IP address. You can accomplish this by using the Address Reservation feature of your router. Click here for instructions.

  1. Login to your router. Click Here for instructions
  2. Click the Advanced tab
  3. Click Advanced Setup
  4. Click Port Forwarding / Port Triggering

port forwarding

service name

  1. 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 Add a Custom Service.
  2. In the corresponding Server IP Address field, enter the last digit of the IP address of your local computer that will provide this service.
  3. Click Add. The service appears in the list in the screen.

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Add a Custom Service

  1. Click the Add Custom Service button

custom service

  1. In the Service Name field, enter a descriptive name
  2. In the Protocol field, select the protocol. If you are unsure, select TCP/UDP
  3. In the Starting Port field, enter the beginning port number
  4. If the application uses a single port, enter the same port number in the Ending Port field.
  5. If the application uses a range of ports, enter the ending port number of the range in the Ending Port field.
  6. In the Server IP Address field, enter the IP address of your local computer that will provide this service
  7. Click Apply

custom service - ports

  1. The service appears in the list in the Port Forwarding/Port Triggering screen

service will appear

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Adding a DMZ Server

The default De-Militarized Zone (DMZ) server feature is helpful when you are using some online games and videoconferencing applications that are incompatible with Network Address Translation (NAT). The router is programmed to recognize some of these applications and to work correctly with them, but there are other applications that might not function well. In some cases, one local computer can run the application correctly if that computer’s IP address is entered as the default DMZ server.

Incoming traffic from the Internet is usually 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 screen. Instead of discarding this traffic, you can have it forwarded to one computer on your network. This computer is called the default DMZ server.

Warning WARNING!

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 computer can be used to attack other computers on your network.

If you understand the risks, follow the instructions below to setup a DMZ server.

  1. Login to your router. Click Here for instructions
  2. Click the Advanced tab
  3. Click Setup
  4. Click Wan Setup

wan setup

  1. Select the Default DMZ Server checkbox
  2. Enter the IP address of the device that will function as the DMZ server
  3. Click Apply

dmz server

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