Anyone know of a good foss network simulator?

Installing and Using OpenWrt Network and Wireless Configuration
1

I am looking for something that is simple and easy to use. Anyone have any recommendations?

2

You mean GNS3 ?

3

There is Filius also

4

Not much for a network simulator if it only runs 4 pings with a simple ping command.
In real life it will be “ohh, f..k how the hell do I make it stop!?”

But to be honest, the best way to actually learn how it works in real life is to actually build it at home. It is really easy to have RasperryPi or similar as test receivers.

But if you want to learn networking you first need to learn the concept of Linux.