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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...
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
Hello again,
Sorry about the delayed response but oddly enough so far there haven't been any bizarre outages since a couple days after the direct power and internet/phone line were reconfigured and cable modem reprovisioned by Spectrum! The last change I made per Netgear CS's recommendation was changing the MTU size to 1475 on 10/16 which was the first MTU size they changed it to when I still had random unexplainable outages. I have not yet moved the satellite and cable modem further than the ~20 feet yet but will today just for better performance in general.
DNS is still currently on 1.1.1.1/1.0.0.1, 2.4GHz on channel 11, and 5GHz on channel 44, which have been there since my first or second call with Netgear CS. Regarding WiFi Neighbors, how would I go about checking their channels? Do you mean my literal neighbors' WiFi or just devices within my network?
For vkdelta I have the Event Logs and Logs attached. For Event Logs, we stopped experiencing any problems beginning on the 17th/18th of October, and before that it only shows a number of "CM-STATUS message sent. Event Type Code: 5" for October 16th. For the Logs, whenever the "online-but-offline" outages occurred they only showed the DHCP lines shown, nothing out of the ordinary.
Thank you both in advance!vkdelta
Logs attached as I could not attach more than one image to my initial post.
Thanks in advance!
