### Filter Access to a RAS Secure Client Gateway You can allow or deny users access to a gateway based on a MAC address. To configure a list of allowed or denied MAC addresses, click the Security tab and select one of the following options: Allow all except. All devices on the network will be allowed to connect to the gateway except those included in this list. Click Tasks > Add to select a device or to specify a MAC address. Allow only. Only the devices with the MAC addresses included in the list are allowed to connect to the gateway. Click Tasks > Add to select a device or to specify a MAC address.