The Marine Corps Tactical System Support Agency (MCTSSA) at Marine Corps Base (MCB) Camp Pendleton is currently conducting evaluation of Wide Area Network (WAN) optimization products. MCTSSA has requested a tool that will conduct stateful TCP replay on large network trace files. This book lays the groundwork and establishes a framework for the development of a testing capability for measuring the efficiency of different WAN optimization products with respect to an excerpt of real-world production TCP flows. It also creates a software tool that will re-create the exchange of data between two hosts from a network trace file and maintain the relative ordering of TCP packets and their TCP payload. In addition, the software eliminates retransmissions that would not occur with the deployment of WAN Optimization gateways.