NetSim is a commercial software and you can know more from http://www.tetcos.com
It 'may' be useful for some network security simulation. If you can give more information about what kind of work you are doing, I can try to answer. There are also other NetSim experts here who might know more.
I would like to do edge computing security in IoT. without hardware support is it possible to do implementation using simulation tool? or if any other opensource tools is there to work on?my research area is IoT edgecomputing security. to work with some light weight algorithms i need tool .please could u help me.