Your PIX 506e security appliance can be used with any AAA server that supports either standard RADIUS or Cisco TACAS+ protocols. Cisco Secure Access Control Server (ACS) is the most obvious choice for pairing with a PIX appliance, and may offer the most functionality. However, ACS would be a pretty expensive way to authenticate and monitor the activity of three users. If you're interested in a shareware RADIUS server, try FreeRADIUS (open source beta) or WinRADIUS (free for up to 5 users). Or if you happen to have a Windows Server handy, you may already have a license to use Microsoft's Internet Authentication Service (IAS) RADIUS server.
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