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The popularity of this thread demonstrates to me that maybe TWC needs to actually do some better (i.e. honest) communicating with it's customers.

My question: My TWC "dynamic" IP address has not changed in 3 years; under what circumstances do they change? Why so much to just have a static IP?

Great answer! Thanks. I have been through a major power outage (most of the city all night) and switching the modem (rental? ya right) - same IP. But I agree, those things should make the odds of getting a new IP number higher. That's partly why I was curious.

Your ideas about the cost are reasonable. Some OSs do indeed go crazy when IP numbers are doubled on the net, good ones use arping to check.

I am more sympathetic to the cable companies on this issue now. They do not communicate this kind of thing well. They just leave the impression that they're just being jerks.

I have a better appreciation of what's involved. Good answer. Thanks!