A New IP, A New Beginning
Many people using BSNL and Airtel connections seem to think that they have the same IP on the internet. They’re all completely wrong. Every time you connect to the internet by using a dialer or by turning on the modem (the modem configuration contains the login details) you are assigned a new IP address. This is called a dynamic IP. (You can always leave your modem on for a long long time and keep a single IP address but this isn’t even an exception. Just holding the IP with an active device.)
Now for sites like Rapidshare that enforce silly limits per IP, dynamic IP comes in very useful. You can simply disconnect and use the dialer program to reconnect. Takes only seconds. But if you have set the modem to automatically connect to the internet you’ll have to turn off the modem and turn it on again for a new IP. The fastest method is to use the dialer to disconnect and then reconnect.
Edit: Creating a batch file to release and renew IP address gives you back the same IP address as ‘A Test’ explained in the comments.
Oh by the way, law enforcement agencies can track you to your house with your IP address depending on how much your ISP cooperates with them. They can simply look up the user account to which the IP address was allotted and then get the address of the user from their billing database. I’m not saying it is often done in India. I’m saying it is possible but it will take time (to contact ISP, get records etc.)

