Distributed Denial of Service (DDoS) attacks on the Internet are used by attackers to be a nuisance, make a political statement (e.g. the 2009 attack against Estonia), or as a weapon of an Internet extortionist. Effective defense against these is a crucial study area, where advanced simulation techniques play a critical role, because of the enormous number of events involved. This paper considers a methodology for evaluating a game-theoretic defense against DDoS. We first describe a basic form of the defense, note the performance limitations suffered by a naive implementation, and then consider methodologies in which a parallelized approach may accelerate performance.