If you have a broadband connection. the only way to change the IP address is to change the MAC address for your network interface card. Which means if you buy a new NIC then you will get a new IP address for your cable modem. Or you can but a cheap router, the router will have a new MAC address which will in return change your ip address. Some routers will also allow you to change the MAC address of the router manually, which will allow you to change your IP address whenever you want. I use a Belkin router, and it works great.
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