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Put the Comcast gateway device in to bridge mode. Here's how;
http://customer.comcast.com/help-and-support/internet/wireless-gateway-enable-disable-bridge-mode
Connect the main Orbi router to port number 1 on the Comcast gateway and power it up. Powercycle the gateway device. Consult the user manual for the Orbi and use the satellites.
When I click the link I get "Welcome to my Account"