  Komondor is a wireless network simulator for next-generation wireless local
area networks (WLANs). The simulator has been conceived as an accessible
(ready-to-use) open source tool for research on wireless networks and academia.
An important advantage of Komondor over other well-known wireless simulators
lies in its high event processing rate, which is furnished by the
simplification of the core operation. This allows outperforming the execution
time of other simulators like ns-3, thus supporting large-scale scenarios with
a huge number of nodes. In this paper, we provide insights into the Komondor
simulator and overview its main features, development stages and use cases. The
operation of Komondor is validated in a variety of scenarios against different
tools: the ns-3 simulator and two analytical tools based on Continuous Time
Markov Networks (CTMNs) and the Bianchi's DCF model. Results show that Komondor
captures the IEEE 802.11 operation very similarly to ns-3. Finally, we discuss
the potential of Komondor for simulating complex environments -- even with
machine learning support -- in next-generation WLANs by easily developing new
user-defined modules of code
