Well I am 70 and jump over the candle stick ;-) I have my home Vonage device connected to a router downstream. Today I connected my neighbor's Vonage device with her new DIR-601. The connection for your DIR-601 is well documented. I suggest you use the web interface to setup your DIR-601. I find the CD setup does not handle all the complexity of networks. If you get stuck, and you may, ask FurryNutz for help. The D-Link and Vonage telephone support folks will be helpful if you need handholding. Don't be afraid, jump in.
Roku rocks. I never look at TV programming anymore. It's IP baby.