Most if not all dynamic IP cable ISP's should provide you with a new IP.
thats what 3 steps?
1) Login to router admin panel
2) Go to page to change mac address of the routers uplink interface, do it to your liking
3) Reboot modem and router to get new IP address
Your modem will grab the new mac and issue another IP most likely, atleast on Charter this works great and on a few other ISP's I know of, if you change the mac addy enough it'll change quite dramatically.
I've also found Charter gives you same dynamic IP for months or till you change mac addy.
- gruntmods likes this