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Forum Discussion
Connected, Online, but ALL Devices Offline? CBK752/CBR750 Cable Modem w/ Spectrum
Hi all, I’ve been back and forth with Netgear CS and Spectrum for the last couple weeks to figure out why the Orbi WiFi 6 model CBR750 (CBK752-100NAS) I purchased to replace the Spectrum provid...
What Firmware version is currently loaded?
Please post a copy and paste of the modems connection status page.
Have the ISP check the signal and line quality UP to the modem. Be sure the ISP provisions the modem correctly.
Be sure there are no coax cable line splitters in the between the modem and ISP service box.
Be sure your using good quality RG6 coax cable up to the modem.
Be sure to power OFF the modem for 1 minute then back ON.
https://community.netgear.com/t5/Cable-Modems-Routers/General-info-and-Troubleshooting-for-Cable-Modems/m-p/1530376#M12853
What is the size of your home? Sq Ft?
What is the distance between the router and 📡 satellite(s)? 30 feet or more is recommended in between RBR and RBS📡 to begin with depending upon building materials when wirelessly connected.
What channels are you using? Auto? Try setting manual channel 1, 6 or 11 on 2.4Ghz and 40 to 48 channel on 5Ghz.
Any Wifi Neighbors near by? If so, how many?
Thanks again for redirecting me to the proper section!
- Firmware on CBR750 is currently on the most up-to-date V4.6.3.6_2.0.48, satellite RBS750 on up-to-date V4.6.3.16.
- I have tried replacing my ISP's / Spectrum's provided coaxial cables with my own RG6 quad-shielded coaxials with and without the Spectrum provided splitter to split phone and internet as well as shutting the Orbi cable modem off for up to 2 minutes.
- Home is approximately ~2000 square feet with both cable modem and satellite positioned on the second floor to beam down from an open loft and kitchen area at approximately 20 feet apart from each other.
- I have tried a few different configurations with wifi channels according to Netgear Technical Support including adjusting MTU values (from 1500 to 1475 to 1472 to 1492 and now back to 1475), increasing 2.4GHz and 5GHz CTR/RTS Thresholds to their maximum values of 2347, and trying Google's 8.8.8.8/8.8.4.4 and Cloudflare's 1.1.1.1/1.0.0.1 IPv4 DNS settings.
- Spectrum has replaced an old coaxial cable and disconnected any unused coaxial cables connected to an amplifier in our attic and provided two dedicated lines for power to the amplifier and internet/phone which is then split accordingly. According to the few techs and supervisor that have stopped by, signals are great and everything up to the Orbi cable modem is excellent. As mentioned before, the Orbi cable modem is now on its third reprovisioning.
- There are generally 2-3 wifi neighbors.
Screenshot of the up/downstream bonded channels attached as in-post photo doesn't seem to work:
Seeing some correctable and un-correctables, something that the ISP needs to look into.
Also 20 feet is too close between the RBS and RBR. 30 feet or more is recommended in between RBR and RBS📡 to begin with depending upon building materials when wirelessly connected.
What channels are most of your closest wifi neighbors using on 2.4 and 5Ghz?
What channels are you using on the CBR?
You can leave the MTU value at 1500.
I would leave DNS at ISP default for now.
pls paste the Event logs and network logs
