The Internet of Things (IoT) may introduce ‘wholes’ in your home LAN. If you are concerned about this, you may opt to block the access of those devices to the Internet, provided that the management software is supporting alternate ways to control the devices, like Synology Surveillance Station. Here is how you can proceed with DD-WRT (v3.0-r39960M kongac (06/08/19)):
Login to the DD-WRT router and select Access Restrictions. In the WAN Access Tab, edit the Access Policy.
- Edit the “List of Clients” and enter the MAC Address of each device you want to block. Alternatively, you can use the IP Addresses. Save the list before closing.
- Enable the Status
- Select PCs Deny
Save and Apply settings.
read also my post Block a group of IP addresses from accessing the Internet