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Keeping "smart" devices on guest network
(lemmy.world)
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this post was submitted on 29 May 2025
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Privacy
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A better solution is to use a pihole to block all domains that the TV pings, and only let through ones that allow you to use streaming apps (i.e. netflix API domain.)
Another good solution is to block WAN access for specific devices and only allow them to communicate over LAN. This would be done on your Router. This method would allow local streaming using Jellyfin but wouldn't allow streaming apps like Netflix since that requires communication with the outside Internet.
If you're worried about your IoT devices on your LAN the problem isn't necessarily that they can access WAN but rather that there's a security vulnerability and that they can be accessed by the WAN. Once a device is compromised and attacker can then use it as a "beachhead" to access other devices on your network.
So for example, with my setup every IoT device is on a separate VLAN (the guest network acts similarly) which can't get access to WAN, can't be accessed from the WAN and can't initiate any network calls to any other VLAN. Now my primary VLAN can talk to my IoT VLAN, and IoT can talk back, it just can't start the communication.
This does pose a problem for TVs though that need to talk to Jellyfin as hinted at in the original post. So what you could do is create a specific firewall rule that allows the TVs to at least initiate communication to Jellyfin but not any other device on your primary VLAN. This will probably require a more sophisticated router though than most of the consumer ones out there. Just be mindful that if n IoT device is compromised they can then try to attack the jellyfin server to jump to your other VLAN and then the rest of your network.