Static means it doesn't change at all ever. Dynamic means there's a way to change it. Sometimes quickly and sometimes not. I have dynamic IP that is 24 hours persistant. That means I have to unplug it for 24 hours to get a new IP. If I don't wait 24 hours, I'll keep getting the same IP forever and ever. If I change my MAC, I get a new IP. If I change it back within 24 hours, I get the one I had before. Thus, I can actually lock as many IPs as I want, just by changing MAC to get them, then revisit each MAC before 24 hours has passed...
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