Upgrade the cable modem today

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http://forums.fedoraforum.org – Got the newest Comcast cable modem today. DOCSIS 3.0, whatever that is. This after my wife changed our plan and got something called "Blast". I think it includes 50MB down but I'm not sure. Anyhow, I set up the modem and had no internet, but when I tried a web page I was redirected to a setup page for this new modem. Went through the painless steps and was up and runnig in no time. Here's the thing though. All the ip addresses are 10.x.x.x. While this works well I'd prefer a 192.x.x.x scheme. It appears that I can change this in the modem setup pages but I'm hesitant. I assume I need (HowTos)