OBI200 - Switch from FIOS to Optimum blocks everything

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DanJS:
After some research and much trial and error - following instructions to disable DHCP within the OBI 200 and assigning a specific IP address resolved the problem without having to shut off firewall or do DMZ server.  I have no idea why the extra hop caused the default setup to fail - perhaps multiple DHCP services accessible in the environment?  The ARRIS surfboard is not supposed to have DHCP services as it is just a "plain" modem but I am no DOCSIS expert so I can only speculate.  Thanks for letting me request some feedback and assistance.

SteveInWA:
Good work, and thanks for the "epilogue".  For the sake of accuracy, the OBi 200 does not have any router functions and does not have a DHCP server.  You merely assigned an address to the device, which it is getting from your former FiOS router.  You're correct about the ARRIS box, it's just a modem.  From the standpoint of the router, there is no difference between the Internet WAN connection, be it from FiOS or from a Cable modem.  FiOS ONTs provide an Ethernet interface that gets its public IP address from the DHCP server at the ISP head-end, just like a cable modem.  Your router acts as your private DHCP server.

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