For over a decade now, RADIUS servers have been a mainstay of dial-up and VPN access control. The rather inconspicuous RADIUS server, perhaps better known as that beige, general-purpose PC collecting dust in the corner of your data center, has proved sufficient for performing basic duties like validating passwords and granting network access.
Guests, contractors, vendors, business partners, and other temporary users require and expect certain level of network access within organizations that they visit. Corporate network access has been typically open; internal LAN connections have seldom required authentication. Today however, regulatory and other security concerns demand that organizations adopt a more secure posture towards these short-term users.