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The guest network isolation is currently bad / insecure and inflexible on the Orbi family. There should be a separate dhcp / subnet for guest network with ability to allow / disallow direct traffic...
Everyone on this thread should go and upvote either this thread, specifically about the Orbi: https://community.netgear.com/t5/Idea-Exchange-For-Home/Next-Orbi-Firmware-must-allow-guests-to-see-each-other-but-not/idi-p/1248463 or this thread about the R8000, which is the same feature request, but for a different product: https://community.netgear.com/t5/Idea-Exchange-For-Home/R8000-Guest-Network-Needs-Separated-Wireless-Isolation-and-Local/idi-p/1050376 Both have more votes than this thread, but are asking for the same thing.