How do you get DHCP to work through a controller?

I thought I asked this question in the past...
If you add a controller to an external network in a soho environment, how do you get the controller to pass DHCP requests through it.  In order to get it to work, I have to set up a DHCP scope in the controller, which is not what I want to do.  I want to use the existing DHCP service.  The controller doesn't seem to want to send the requests through.           

"Also of you use ISE with the dhcp probe for finger printing, you need to disable it .."
I'm dealing with this exact issue now. You can't simply put ISE in as a secondary DHCP server for the WLAN because it doesn't unicast to BOTH primary and secondary server addresses.
So you're left disabling dhcp proxy and using helper addresses on VLAN SVI's, which is fine if you want *ALL* of your WLANs to use an external DHCP server. In this case we'd like the Guest users to get DHCP addresses from the WLC (they get tunneled to a mobility anchor in a DMZ where there is no DHCP server) and the regular users to use the SVI helper addresses so that the DHCP packets can also be sent to ISE for proper profiling.
I guess we're kind of stuck with it and may have to get the customer to stand up a DHCP server in their DMZ, I see no other way around it at this point.

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