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Solved
Orbi RBR40 will not connect to new Cable modem
We recently upgraded our cable to one gig. We have tried to connect our RBR40 to two different modems, a Netgear NightHawk, and an ARRIS SB8200. In both cases the modem successfully connected to our ...
Glad you got something working. Please mark your thread as solved so others will know. Be sure to save off a back up configuration to file for safe keeping. Saves time if a reset is needed.
https://kb.netgear.com/000062080/How-do-I-back-up-the-configuration-settings-on-my-Orbi-WiFi-System
Enjoy. 📡
What netgear modem were you trying to connect to?
Reason I ask is the SB8200 has 2x ethernet ports but the majority of ISP's only support 1 public IP address. Meaning only 1 device can be connected to it (simple put).
So if you had a PC connected to it to get it setup, you'd have to disconnect the PC, connect the modem to port 1, and follow the guide everyone listed prior.
Without knowing what netgear modem you had before, its tough to know if you had that same issue but you will with the sb8200