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I keep seeing this suggestion (put devices on a subnet, lock them out of everything else)...

Do you have a link or guide to help me understand how to set this up. It seems like a great idea!

The cheapest way would be to go to your WiFi router and look for "Guest WiFi" settings, hope it's not too cheap that this functionality isn't included, activate said network, and put the devices on the guest WiFi.

More complicated settings involve the keyword "VLAN", afaik most home routers don't have this.

How would you send a data to printer that is in separate subnet?

Unfortunately I do not have a guide, perhaps this would be a good idea for a blog post? I'll write something up when I have a free weekend.

Keep in mind that a lot of this will be heavily dependent on what kind of router and LAN configuration you have.

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