Don't give away the Trick yar! There should be some difference btw Hardcore guys and Noobs!
Anyways Now that every one knows! I don't even have to physically turn off modem. Just go to Modem Settings (
http://192.168.1.1/) click PPPoE disconnect button and then reconnet. U will be assigned a new IP and its Done! (My modem is Huawei SmartAX MT880).