NETGEAR WNDR3400v3 Port Forwarding and Port Triggering

Advanced Settings

N600 Wireless Dual Band Router WNDR3400v3

AP Mode. You can make the WNDR3400v3 function as an access point.

Wireless Card Access List. Click the Set Up Access List button to display the Wireless

Card Access List screen. On this screen, you can restrict access to your network to specific

devices based on their MAC address.

Port Forwarding and Port Triggering

By default, the router blocks inbound traffic from the Internet to your computers except replies

to your outbound traffic. You might need to create exceptions to this rule for these purposes:

•To allow remote computers on the Internet to access a server on your local network.

•To allow certain applications and games to work correctly when their replies are not

recognized by your router.

Your router provides two features for creating these exceptions: port forwarding and port

triggering. The next sections provide background information to help you understand how

port forwarding and port triggering work, and the differences between the two.

When a computer on your network needs to access a computer on the Internet, your

computer sends your router a message containing the source and destination address and

process information. Before forwarding your message to the remote computer, your router

has to modify the source information and create and track the communication session so that

replies can be routed back to your computer.

Here is an example of normal outbound traffic and the resulting inbound responses:

1. You open a browser, and your operating system assigns port number 5678 to this

browser session.

2. You type http://www.example.com into the URL field, and your computer creates a web page

request message with the following address and port information. The request message is

sent to your router.

Source address. Your computer’s IP address.

Source port number. 5678, which is the browser session.

Destination address. The IP address of www.example.com, which your computer finds

by asking a DNS server.

Destination port number. 80, which is the standard port number for a web server

process.

3. Your router creates an entry in its internal session table describing this communication

session between your computer and the web server at www.example.com. Before sending

the web page request message to www.example.com, your router stores the original

information and then modifies the source information in the request message, performing

Network Address Translation (NAT):