I have cable modem from Comcast. I am getting a second computer and called Comcast twice about getting a second IP address. The first guy said if I get a router, then I don't need to pay $4.95/month for an additional IP address. I called again and second guy said that I have to pay for an additional IP address, router or not. He said that Comcast does "internet audits" that will retroactively bill me for having the second computer on the internet through Comcast. Which guy is right ?