The Distributed Interactive Simulation (DIS) network architecture and protocol is being developed for the interconnection of large numbers of manned and unmanned simulators. However, little data exists for the performance of this system when implemented on the large scale envisioned. As with most modern communications networks, the complexity of this system is such that traditional analytic techniques such as queueing theory are incapable of accurately predicting system performance. A simulation tool for the analysis of a DIS network is written using Simscript 11.5, a discrete event simulation language. The simulation employs models of typical DIS entities such as aircraft, ground vehicles and infantry and can be a valuable tool for evaluating network performance due to different amounts and mixes of entities, dead reckoning error criteria, and various network hardware and protocols. The simulation makes available extensive statistics detailing the performance of the overall system, making it possible to answer such questions as the number of entities that can be supported on particular network hardware, interrupt rates and the transport delays experienced by individual entities. To illustrate the use of this tool, a DIS network composed of high performance aircraft is examined.