[Hollywood]

/release /renew does not work for changing an IP. When you lease an IP that lease runs for as long as you have that ISP usually. If you are logged off for long period of time then it is possible to receive a new one, but you need to know how long the lease is for and when to release it. Every time you log in to the ISP, or your modem is connected for cable, the lease resets.

Dial up is the exception, and some DSL companies still allow you to change your IP by resetting the modem, but most don't.