I have a dynamic public IPv4 address from my ISP. Is there any way I can update the record for my tunnel automatically if that IP address changes?
http://www.tunnelbroker.net/forums/index.php?topic=34.msg167#msg167
Changing ip address is not a simple thing.. But you can get the site administrator for changing your ip address. I think you must check your ip address in here http://www.whoisxy.com/ before and after change your ip address...