Obri with ATT&T Arris BGW210-700 and Passthrough Setup - Arris DHCP Server

Hi Everyone,

Following the instructions in this forum I was able to get my Orbi working with the Arris BGW210-700 in passthrough mode.  I have a few questions on the setup and looking for some generous support and education.

1. One of the items is on the Arris BGW210-700 I kept the DHCP server on as well as the Orbi's.  The Orbi is serving as a router.  I tried turning off the DHCP on the Arris, but after that I couldn't access anything Internet related so I reset the Arris, followed the instructions here and didn't turn off DHCP.  Everything is working fine.

2. Should DHCP on the Arris be left turned on so it gives an IP to the Orbi?  

3. As a result of resetting things on the network, I used to be able to access my UDI Polisy (Home Automation Server) via https://polisy but now I cannot.  I can access via IP address, but I'm wondering what's wrong that I cannot access via the URL hteps://polisy like I was able to before.

Thanks for any support / education you can provide.

Jeff