This document provides instructions for simulating legacy networks like Pure Aloha and Slotted Aloha using NetSim. It describes how to create a scenario by adding wireless nodes and adhoc links. It also explains how to set node, link, and application properties, enable packet tracing, and run the simulation. Finally, it notes that legacy networks are non-IP based and run standalone, so they cannot be connected to Internetworks. NetSim provides the ability to simulate these older legacy networks that are rarely used today for educational and research purposes only on an unsupported basis.