hostapd - IEEE 802.11 AP, IEEE 802.1X/WPA/WPA2/EAP/RADIUS Authenticator

hostapd is a user space daemon for access point and authentication servers. 
It implements IEEE 802.11 access point management, IEEE 802.1X/WPA/WPA2/EAP 
Authenticators, RADIUS client, EAP server, and RADIUS authentication server. 
The current version supports Linux (Host AP, madwifi, Prism54 drivers) and 
FreeBSD (net80211).
