I have an internal network of about 25 computers behind an ASA 5505. The ASA assigns DHCP to whatever connects to the network via LAN or Wireless. I would like to restrict network access to authenticated users. Ideally, I would like to provide a list of authenticated MAC addresses and require username and password for for any device not on the list. My question is: Is this possible with the ASA, and can anyone point me in the right direction to get started? Thank you in advance for your time.