I would have no idea how to write these rules exactly, but if you have a Linux router you could:
- Assign a static DNS lease to Chromecast's MAC address
- Assign a static DNS lease to his tablet's MAC address
- Set up some iptables commands that discard all traffic directed from the tablet to Chromecast
- Or you could even go further and assign all your devices to a whitelisted range of IP addresses, configure the dynamic DNS range to be outside of that whitelist, and discard all traffic to Chromecast from outside the whitelist.
Alternatively it may be possible to segregate the network into two SSIDs that act as separate LANs.
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