You can share a high-speed DSL connection between multiple users without a major decrease in Internet speed. Each brand of router uses a slightly different set-up method, but they all share several common steps that are necessary to configure your router to share a DSL Internet connection.
1). Select a location for your wireless router. The router should ideally be near your DSL modem and a computer.
2). Unplug the DSL modem from its power outlet. Plug the router's power cable into a wall outlet. Connect the Ethernet port on the back of your DSL modem to the WAN port on the back of the router with an Ethernet cable. The WAN port will be slightly separated from the other Ethernet ports on the router. Plug the DSL modem back into the wall outlet.
3). Connect one of the LAN Ethernet ports on the back of the router to the Ethernet port on your computer with an Ethernet cable. If you cannot directly connect to an Ethernet port, connect to the router's wireless network with a computer that has a wireless networking card. Select the name of the network from the computer's "Available Networks" list, which is accessible from the network icon in the task bar.
4). Open a web browser and enter the router's IP address into the address bar to access the router's configuration page. Consult the router's manual if you do not know the default IP address. Log into the router's configuration page with the proper credentials. These credentials vary by brand, but are often either blank or some combination of "admin" and "password."
5). On the "Setup Wizard," "Basic Setup" or "Internet Setup" page, select either a "PPPoE" connection type or a "DHCP" connection type. If your DSL connection requires a login name and password, it is a PPPoE connection. Otherwise, it is a DHCP connection.
6). Type in your login name and password if you have a "PPPoE" connection. If you do not know your DSL credentials, contact your DSL provider.
7). Click "Save," "Connect" or "Apply" to save your changes. Attempt to connect to a web page on the Internet to test your connection.