I'm having exactly the same problem as Lori did on a previous post. I have a D Link WIRED router that's been on my network for years and I'm trying to install am SMC 5 port switch. The switch is at the end of a 75 foot Cat 5 cable, According to the manufacturer's tech support I should be able to connect either a computer or router to any port on the router. Tech support and I set up two computers, with static IP addresses, through the switch and they worked fine. Not using the switch I can ping anywhere in the world from any of 3 computers connected to this router. I tried using a crossover cable between the router cable and the switch and that didn't work either. I would appreciate any other ideas.