Vernier Network

Vernier Network has created a system that is
actually two hardware devices able to protect your WLAN with the following
functionality:

Authentication

Control

Redirection

Logging of network traffic (respective to each WLAN)

These two devices are a control server and an access manager.
The solution is designed to add safeguards to your WLAN that protect
against laptop or mobile devices attempting to connect to your WLAN.
Realizing that the inherent security measures of the typical WLAN are
not sufficient to protect your network resources, this solution attempts
to provide you with that mission-critical protection.

The control server is able to manage authentication at one central
location for all wireless users and to account for roaming and policy
enforcement.
The access manager sits on the perimeter of your network and is able
to connect your access point devices. The idea is that it can enforce the
user rights for authenticated users. You can also enable roaming, as
well as security features and functionality including:

IPsec

Point-to-point tunneling protocol (PPTP)

Layer 2 tunneling protocol (L2TP)