Hello, i am trying to connect two computers one a dell laptop,the other a gateway tower both running xp pro serv. pack 3 through a single ethernet modem and a linsky router--my isp is at@t the modem is a motorola
First, make sure the modem is properly configured to connect to the internet. For that, refer to your account details with ATT, connect one of the computers directly to the modem via ethernet, and take it from there, according to your modem's documentation.
Once that works, disconnect the PC, and connect the WAN port from the router to the modem instead. Then connect the PC to one of the ethernet ports of the router. Enter the router's configuration utility (either the dedicated utility that came with the router, or a browser-based configurator, according to your router's specs and documentation). Then, after this PC is connected, repeat for any other PCs in house, wired or wireless. Make sure you secure your WiFi if you go that route.