I spent several years as the lead on what was at the time the most widely deployed DDOS product in the core of the Internet; I do not know what you are talking about. Could you maybe be more specific about why this particular DOS attack requires extreme statekeeping from middleboxes? I don't think it does.

Like. I said, within a network accelerator lab (or in laymen terms, an artificial DDoS whitelab environment for testing middleboxes).