Network.Sim is a software for modeling and simulating computer networks. It implements a full network stack up to the IP-layer and provides a simulation of the IEEE 802.3 data link and physical layers including MAC/LLC and address resolution (ARP). It can be easily extended to support simulation of LAN technologies other than Ethernet such as IEEE 802.5 (token ring) or IEE 802.4 (token bus).

The program comes with a couple of example scenarios demonstrating some of the basic principles of local area networking such as network address resolution and the CSMA/CD media access control method for resolving collisions during frame transmissions.

A scenario is a simple C# class that inherits from the Scenario Base class. On startup the program will look for any C# source files in the /Scenarios directory and compile them on-the-fly, so in order to create your own scenario you can simply copy and adapt one of the existing C# scripts.

After selecting a scenario you can run/single step through it in the command-line interpreter. The interpreter also provides a couple of other commands that let you examine a host's ARP and routing tables, etc. Type 'help' for a list of all available commands.

Source code documentation can be found here.

This program is copyright © 2013 Torben Könke.

This program is released under the GPL license.