NETGEAR RangeMax™ Dual Band Wireless-N Router WNDR3300 Reference Manual

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.

The Web server then sends this reply message to your router.

5.Upon receiving the incoming message, your router checks its session table to determine whether there is an active session for port number 33333. Finding an active session, the router then modifies the message, restoring the original address information replaced by NAT. The message now 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 your computer’s IP address.

•The destination port number is 5678, the browser session that made the initial request.

Your router then sends this reply message to your computer, which displays the Web page from www.example.com.

6.When you finish your browser session, your router eventually senses a period of inactivity in the communications. Your router then removes the session information from its session table, and incoming traffic is no longer accepted on port number 33333.

How Port Triggering Changes the Communication Process

In the preceding example, requests are sent to a remote computer by your router from a particular service port number, and replies from the remote computer to your router are directed to that port number. If the remote server sends a reply back to a different port number, your router does not recognize it and discards it. However, some application servers (such as FTP and IRC servers) send replies back to multiple port numbers. Using the port triggering function of your router, you can tell the router to open additional incoming ports when a particular outgoing port originates a session.

An example is Internet Relay Chat (IRC). Your computer connects to an IRC server at destination port 6667. The IRC server not only responds to your originating source port, but also sends an “identify” message to your computer on port 113. Using port triggering, you can tell the router,

Fine-Tuning Your Network

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v1.0, February 2008

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NETGEAR WNDR3300 manual How Port Triggering Changes the Communication Process
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WNDR3300 specifications

The NETGEAR WNDR3300 is a versatile and powerful wireless router designed to deliver reliable network performance for homes and small offices. Launched as part of NETGEAR's popular RangeMax series, the WNDR3300 encompasses several advanced technologies to ensure robust connectivity and seamless internet access for multiple devices.

One of the standout features of the WNDR3300 is its dual-band capability. Supporting both the 2.4 GHz and 5 GHz frequency bands, the router enables users to connect multiple devices without interference. The 2.4 GHz band offers broader coverage and is ideal for basic web browsing and email, while the 5 GHz band is designed for high-bandwidth activities such as video streaming and online gaming. This dual-band operation helps to alleviate congestion, improve performance, and enhance the overall user experience.

With its 802.11n wireless technology, the WNDR3300 boasts impressive speeds of up to 300 Mbps. The router utilizes MIMO (Multiple Input Multiple Output) technology, which employs multiple antennas for both transmitting and receiving signals, resulting in improved range and coverage. This technology is particularly beneficial in larger homes where traditional single-antenna routers might struggle to provide strong signals in distant rooms.

Another significant aspect of the WNDR3300 is its built-in firewall and security features. The router offers WPA/WPA2 encryption, which protects users from unauthorized access and secures personal data while browsing. Additionally, the router includes parental control features, enabling users to manage their family's internet usage effectively. These controls allow for the restriction of specific websites, scheduling of internet access times, and monitoring of online activity.

The WNDR3300 also includes several Ethernet ports, allowing for wired connections to desktops, gaming consoles, and other devices. With four LAN ports, users can easily connect multiple devices for stable and high-speed internet access. Moreover, the router supports dynamic DNS and VLAN support, making it a suitable option for advanced users looking to customize their network setup.

Installing and configuring the WNDR3300 is straightforward, thanks to its user-friendly web interface. NETGEAR also provides a WPS (Wi-Fi Protected Setup) button, allowing users to connect devices securely with just a push of a button, simplifying the connection process.

In conclusion, the NETGEAR WNDR3300 is an excellent choice for users seeking a reliable and fast wireless networking solution. With its dual-band capabilities, advanced security features, and user-friendly setup, it effectively meets the demands of modern internet usage, making it a valuable addition to any home or small office network.
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