Secure Computing SG300 User Manual page 84

When the Access Control List is disabled (Disable Access Control List), any wireless
client with the correct ESSID (and encryption key if applicable) can connect to the
wireless network. For additional security, you can specify a list of MAC addresses
(network hardware addresses) to either allow or deny.
Select Allow authentication for MACs in the Access Control List to disallow all but
the MAC addresses you specify, or Deny authentication for MACs in the Access
Control List to allow all but the MAC address you specify. Click Update.
Enter a MAC to allow or deny and click Add. A MAC may be removed from the list by
clicking the corresponding Delete icon.
Warning
This is only a weak form of authentication, and does not provide any data privacy
(encryption). MAC addresses may be forged relatively easily.
80
Network Setup