Opensource is known to offer free software alternatives in almost every domain and network security is no exception. We’ve had opensource IDS/IPS for a while but for wired networks only. With Aircrack-ng, we’ve mastered wireless attacks and now it’s time to use that knowledge to be also on the defensive side to mitigate those attacks. In this talk, I’ll present OpenWIPS-ng, a new modular and opensource wireless IDS/IPS.