Smart Home devices need to communicate with each other on the Guest Network

Thanks, 

I opened a "Case" with Netgear support, but of course, they told me to connect my Echo's to my Local Network and see if that fixes the issue.  Yes it does, but I don't want any of my Smart Home devices to have access to my Local network.  Smart Home devices should have their own path to the internet "outside" my Local network (that's what a Guest Network is for).  Unfortunately, as Smart Home devices get smarter, they need to be able to communicate with each other.  That's where Netgear is falling short by not allowing Guest Network devices to be able to communicate with each other.