I just got a new network switch and am learning about VLANs. People say to put IOT devices on their own network.
If I isolate my Hubitat will my Google Home still be able to contact my Hubitat somehow and control devices? I assume there's some cloud gateway that makes this all work. Or does it somehow know how to find my Hubitat on the LAN?
My sense of Google integration is that the hubitat vlan (virtual local area Network) and your user vlan both need access to the WAN (wide area network). Hubitat talks to Google on the WAN. No Internet, no integration.
Thanks! I will report back once I get this all tested.
Something else to note is that in many cases folks believe that the Google Home and Hubitat are both IOT devices and since both in that category would end up on the same IoT Vlan. Though the Google Home control functions are cloud based, there are Chromecast based functions that are over the LAN and as such them being on the same Vlan will help with that.
For devices on your trusted network you would need to create rules to allow them to be routed to specific devices on your IoT Vlan. The configuration depends on the gear you have. It was fairly easy with Unifi for me.
That's how I do it...IoT VLAN has Google/Alexa smart screen devices, along w/HE hub and all other IoT devices. Firewall rules set up so that Management/Personal VLAN can access anything on IoT, and IoT devices can only respond to Management/Personal VLAN contacts (using an "established/related" rule for IoT VLAN).
@user3350 Setting up a VLAN is not necessarily a simple process, and many very smart people here run Hubitat/IoT w/out one, so I would think twice about setting one up unless it's something desired generally for fun/learning (that was my initial motivation) and you enjoy trouble-shooting (cross-VLAN issues may come up). 
Agreed. Unless you’re actually pro at this stuff (and I definitely am not), be ready to accept the consequences of potentially borking LAN and/or WAN access at home while you learn on the “job” (ask me how I know).
LOL...already a member of that club. Set up my first VLANs five years ago on an EdgeRouter via CLI, and then had to also manually set up 6 Netgear managed switches, two groups of three that had two completely different UIs/interfaces. Led to some interesting "WTF?!?" moments. 
Have to say VLAN/Firewall setup on the Unifi CGU/switches is light years improved.
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