DSL-504 ADSL Router User’s Guide

network (but not on the Internet) and vice-versa. The Router allows up to 253 host IP addresses.

NAT has two major benefits. First, NAT allows many users to access the Internet using a single global IP address. This can greatly reduce the costs associated with Internet access and also helps alleviate the current shortage of Internet IP addresses. Secondly, the NAT process creates a firewall, which hides your local network from Internet users, providing a degree of security to your Internet connection.

To be successfully implemented, NAT should be used only when the majority of network traffic remains on the local network. In cases where a large percentage of network traffic is destined for the Internet, NAT can adversely affect the speed and performance of your Internet connection. Network servers such as ftp servers, web servers or mail servers should use the port redirection capabilities of the Router.

NAT will work in conjunction with DHCP and Port Redirection. Thus, if both are enabled and properly configured, the DHCP server in the DSL-504 will assign local IP addresses to computers on your network. The Port Redirection feature allows an administrator to direct specific types of incoming packets to another server or designated host. For example, a common way to use Port Redirection would be to direct incoming HTTP packets (through TCP logical port 80) and redirect them to an HTTP server (conventionally through port 8080).

How NAT Works

In the most common NAT configuration, your network uses local IP addresses that are not valid on the Internet. Each Internet (global) IP address is unique. Your network administrator can assign local IP addresses on your network (within guidelines defined later in this chapter and in “Appendix B, IP Concepts”). This can be done manually or by using DHCP. The WAN port on the router is assigned a globally unique public IP Address that is valid on the Internet, since it will be sending and receiving data directly to the Internet and is therefore part of it. Please study the example diagram below carefully.

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D-Link DSL-504 manual How NAT Works
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DSL-504 specifications

The D-Link DSL-504 is a versatile and reliable ADSL modem/router that has been designed to meet the needs of both home and small office users. With its compact size and user-friendly interface, this device has garnered popularity among those who require stable internet connectivity without the complexity of managing multiple devices.

One of the main features of the D-Link DSL-504 is its ADSL compatibility, which enables users to take full advantage of high-speed internet connections offered by ADSL service providers. This modem/router supports a wide range of ADSL standards, including ADSL2 and ADSL2+, providing users with robust performance and efficient bandwidth utilization. This means users can enjoy faster download speeds and improved upload rates, making it ideal for activities like streaming, online gaming, and video conferencing.

The D-Link DSL-504 is equipped with several Ethernet ports that allow for wired connections to multiple devices, ensuring that users have the ability to connect their PCs, laptops, and gaming consoles directly to the network for optimal performance. Additionally, the built-in wireless capability offers Wi-Fi connectivity, allowing users to connect their smartphones, tablets, and other devices without the need for cumbersome cables. The wireless transmission uses the 802.11g standard, providing speeds of up to 54 Mbps.

Security is a significant concern for home and business users, and the D-Link DSL-504 addresses this with a variety of security features. It supports encryption standards like WEP and WPA/WPA2, ensuring that wireless connections are secure from unauthorized access. The device also incorporates a built-in firewall, providing an additional layer of protection against external threats.

The DSL-504 offers easy setup and management through a web-based interface, allowing users to customize their network settings effortlessly. The intuitive configuration wizard guides users through the process, making it accessible even for those with minimal technical expertise.

In summary, the D-Link DSL-504 is a reliable ADSL modem/router that combines speed, security, and ease of use. Its compatibility with various ADSL standards, multiple Ethernet ports, built-in wireless functionality, and strong security features make it a compelling choice for anyone looking to establish a stable internet connection. Whether for home use or small office operations, the DSL-504 provides the necessary tools to enhance connectivity and productivity.
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