I’ve come across devices where they will stop functioning or flood my network with DNS requests if they can’t reach their baked in addresses. I setup a redirect rule to handle that. ANY 53 request gets redirected to my DNS server. I’ve had similar issue with NTP and had to do the same.
At the same time they are assigned an IP that’s part of a subnet that has a rule preventing access to WAN. It allows me to “contain” my smart home devices but continue to work as much as possible on LAN without it freaking out.
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