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Isolated guest wireless with separate DNS (and DHCP)

Jacques Assert

Occasional Visitor
I'm trying to allow guest wireless access with no access to my intrAnet.

I have an Intranet with a Windows DC (Server 2012 R2) and an ASUS RT-AC66U acting as the NAT to the Internet.

If I use the Windows DC for DHCP, then I can't enable AP isolation on the guest wireless, as it's unable to send/receive DHCP requests to/from the intrAnet. So the ASUS is currently the primary DHCP.

If I use the Windows DC for DNS, then I can't enable enable AP isolation on the guest wireless for the same reason. But if I use the ASUS for DNS as well, then the DC breaks in multiple ways.

What I would like is to use my Windows DC for DHCP and DNS for everything *except* guest wireless, and use the ASUS DHCP and DNS for the guest wireless, ideally on a seperate subnet. But even if they all lived on the same subnet, the DNS must be separate.

Any suggestion for how this can be achieved effectively?
 

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