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Forum Discussion
Verizon Fios
Is it compatible with Verizon Fios?
FWIW, your setup has a downside in that your new subnet is double NAT'd. Some applications may not take well to this. Since it works, great, but for reference, there are other options with various tradeoffs. This FAQ over on dslreports.com lists them all. Your current setup corresponds to option 2.
You can put the Orbi router in AP mode if you want. You would have a wired connection between your main router and the Orbi router in that scenario.