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Access Control or Wireless MAC Filtering is used to block or allow specific client devices to access your network based on a list of blocked devices (Blacklist) or a list of allowed devices (Whitelist).

The function name might be different on different router models, please follow the steps below to set them up:

1. For Access Control, you may login the router's web management interface, go to Advanced > Security > Access Control to configure Whitelist or Blacklist. You could also refer to this FAQ for more details: How to configure Access Control on the Wi-Fi Routers

2. For Wireless MAC Filtering, you may login the router's web management interface, go to Wireless > Wireless MAC Filtering to configure Filtering Rules. You could also refer to this FAQ for more details: How to configure Wireless MAC Filtering on TP-Link 11N wireless router