I have a problem. My router is plugged into my cable modem, then giving wifi to all the house. Seeking faster download speeds for a large download, I directly plug my laptop into the cat5e cable coming from the modem. and it doesnt work. I turn the modem on then off, unplug it then plug it back in, and it still doesnt work. I run windows network diagnostics, and it tells me that my IP configuration is invalid and it couldnt fix the problem. so i plug the router back in and use the wifi to ask this question. Please help me figure out what im doing wrong!