[hrktb]

naive question: would it be realistic to filter who gets to talk to who, on wich protocols at the router level ?

I guess basic rules could be setup, but would there be a higher level way for that kind of orchestration

[mavhc]

A much better LAN firewall will be needed, can also mean you can easily get rid of 1 to many NAT with IPv6. It would have to be self learning for any hope of adoption by the mass market