I got several of those alerts myself today. Not form the exact same IP address but one very close that traced back to the same places. Only thing I've been able to find on the net is that when you download stuff form the net it's sent in fragments, and that a small fragment error means some of the information it was expecting in the fragments was missing, therefor they were smaller than expected. How a person can cause such an issue I have no idea. Nor do I have any idea how it actually effects those of us receiving the attacks.