RBR20,working fine over a year on Comcast Voice Modem . Drops Internet after 2nd ATT modem install

Modem Combo Units:
This would be a double NAT condition which isn't recommended. https://kb.netgear.com/30186/What-is-Double-NAT
Couple of options,
1. Configure the modem for transparent bridge mode. You'll need to contact the ISP for help and information in regards to the modem being bridged correctly. Then use the Orbi router in router mode.
2. If you can't bridge the modem, disable ALL wifi radios on the modem, configure the modems DMZ/ExposedHost or IP Pass-Through for the IP address the Orbi router gets from the modem. Then you can use the Orbi router in Router mode.
3. Or disable all wifi radios on the modem and connect the Orbi router to the modem, configure AP mode on the Orbi router. https://kb.netgear.com/31218/How-do-I-configure-my-Orbi-router-to-act-as-an-access-point and https://www.youtube.com/watch?v=H7LOcJ8GdDo&app=desktop

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18rabbit wrote:

My Orbi RBR20 router with 2 satelites has been working fine for over a Year. Recently in California my county was subject to forced county wide electric shut off. My Comcast modem and Orbi router were both on battery backups. both systems kept running but no Internet access due to Comcast signal failure.

Decided to connect a new Att UVERS modem with WIFI on a ATT land line that suposedly would remain work.  Ordered new ATT  UVERS modem to connect to my land line assuming I would have a backup WIFY system on the ATT UVERS with battery backup on the modem.

After install of ATT modem I tested new WIFI and it worked fine. The comcast WIFI was up and working with the ORBI 20 and satellites.

I have a video security system on the two statellites and it started to fail. After checking ORBI I found the internet connections had failed but the equipment was still connect to the ORBI WIFI, veryfied by checking the MACs of my cameras.  The ORBI device mgr did shoe my send and last satellite with a orange  status lite verses the normal green status lite.

I found that if I unplug the UVERS modem the Orbi system will start to work and indicate that I have Internet access.

I notice on the support page a link to a video showing how to disable the ATT UVERS WYFI signal on the modem. I am assuming someone has had a similar problem as I am have with the two active WIFI Comcast and ATT signals and resolved the problem by disabling the ATT WIFI signal and you then would connect the ethernet port for internet access.

By unplugging the ATT modem I effectivelly disabled the WIFI signal; this does resolves the problem of no internet access on my ORBI systems.  Question is this the only solution to operating the ATT UVERS modem and the ORBIsystem Compact WIFI extender simutaeously? I will use the ATT disable configuration if this is the only solution.

Thanks for any help on this.

18rabbit

 

 

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