I have a Synology NAS connected to the router via CAT-5. The problem is that I want people to be able to access my LAN, but not the internet. If I put them in the Whitelist, they have access to the...

I have the latest Archer C9 AC1900 Wireless router and I want to be able to set up a rule where all non-reserved IP addresses are blocked from accessing the internet. A little background is that I...