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Fiber Modem and Orbi connectivity problem
Recently purchased the Netgear Orbi RBK753S High-Performance Whole Home Mesh WiFi System from Amazon. Cannot get it to work when connected directly via ethernet cable to my Adtran SDX 621 fiber mode...
My ISP did an update on their fiber modem ONT and the Netgear Orbi started working as it should after a restart.
Could/should have been answered where you first posted this problem:
Solved: Adtran SDX 621 fiber modem and Netgear Orbi RBR750... - NETGEAR Communities
Stuff added there to the sage advice from CrimpOn.