Tenda A5s User Manual page 59

use the MAC Filter feature to allow or disallow specified PCs to
access Internet.
Click "Add" to enter page below:
Filter Mode: Select Deny or Allow according to your own
needs.
Deny Access to Internet: Disallow specified packets to
pass through the device; other packets are processed
according to default mode.
Allow Access to Internet: Allow specified packets to pass
through the device; other packets are processed according to
default mode.
Description: Simply describe current rule/rule.
53