Hook grandma up with a $30 chinese firewall box, and disable UPNP? Plug modem into WAN, computer into LAN, turn it on, done. True, it will be called a "router"

Hook grandma up with a $30 chinese firewall box, and disable UPNP? Plug modem into WAN, computer into LAN, turn it on, done. True, it will be called a "router" in consumer speak, but all consumer IPv6 routers should actually be firewalls.