this post was submitted on 26 Nov 2023
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A DNS filter (Pihole) will only stop the TV from DNS resolution, and won't necessarily stop it from trying to phone home to some dodgy servers if the IP addresses of said dodgy servers are baked into the OS.
I don't fully understand why you are concerned about what the TV can access on WAN, and not about what the TV can access on LAN? Put it on its own subnet if you're worried about it sending information back about other devices on your network.
Good point about DNS filter. As for LAN vs WAN, It seems easier to secure your own lan? I don't want the TV acting as a bot net or reporting stuff to some server. So it seems like securing it to only access certain domains would be useful.
If your router supports it, place the TV on it's own vlan.