Well, I have a network set up with a cable modem, using a router. The router gets its global IP from a DHCP server, but for some reason the IP never actually changes unless I do something to the router, like change its MAC address. So, I figure if I just had a MAC address generator I could change my IP address whenever I needed to, like if my node becomes overcrowded. I also figure its a good idea to change it once in a while just for security's sake.