Shamless plug. Please go check out the next Forge tool we've just released!
WifiForge provides a safe and legal environment for learning WiFi hacking. Based on the open source mininet-wifi, this project automatically sets up the networks and tools needed to run a variety of WiFi exploitation labs, removing the need for the overhead and hardware normally required to perform these attacks.
Note: WifiForge is still in its infancy constantly changing and growing, with growth comes issues and pain. This product is not promised to be stable, and should not be used outside of a virtual machine at this time.
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