re: What are the downsides of switching to AT&T Fiber? (For a business)

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I have zero complaints about ATT Fiber, but short of some frickery, you can’t use your own router/gateway.

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With a business connection you can and should use your own equipment. They'll mount the Cinea service delivery switch then hand off to a router. You can't modify the config on the att router so you're best off using your own gear from there.