[pest]

My dsl IP reset every time I lost power to my modem (no ups backup). Dynaminc (well, actually a ppoe connection).

On the other hand, I had fits trying to set up my router for my cable modem. I assumed that since a friend of mine has cable on the same network and his IP hasnt changed in three years, that our cable was static. Customer support set me strait and all problems solved. Dynamic behaving very much like static.