This is only practical for an internal network with a consistent user base. If you set up MAC access control with an Allow policy, you must manually add the MAC address of each new device to the ACL. Or, if you want to maintain strict network security, you can allow only devices with known MAC addresses to connect. A MAC access control list (ACL) lets you permit or deny WiFi access to individual devices based on their MAC addresses.įor example, if you notice a guest device that is using too much bandwidth, you can deny WiFi access to it without affecting other guest devices. Almost all networked devices have a MAC address, including computers, switches, access points, smart phones, and storage systems. A media access control (MAC) address is a unique hardware identifier.