A private WLAN with an ACS. A workstation running the Linux operating system functioned as a Network Address Translation (NAT) server. The private LAN was linked with the Internet through a switched hub or router. The AP was configured to use ACS for AAA services for the EAP-enabled wireless devices over the WLAN. A Windows 2000 Server running Active Directory was used to mimic a NAS to negotiate with ACS through the RADIUS protocol.