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cm1100

4 Topics

CM1100 won't connect to routers
I have a CM1100 that started having issues today. It will not connect to my router. It will, however, connect directly to a laptop. My setup is: ISP -> CM1100 -> Router/Firewall -> APs & Switches But the link between the CM1100 and Router/Firewall doesn't work. If I change things up: ISP -> CM1100 -> Laptop Everything works just fine. It does not matter which port I connect to on the CM1100. Here are my troubleshooting steps: Power cycle the modem and Router/Firewall Check the coax connection on the CM1100 Try both ports on the CM1100 Try different WAN ports on the Router/Firewall Try different cables with steps 2 and 3 Connect my cellular modem to the Router/Firewall and verify that internet works on both WAN ports Try different cables between the cellular modem and Router/Firewall Try a new Router/Firewall on the CM1100, repeating steps 2, 3 and 4 Pick-up a modem from my ISP and verify it works with both Router/Firewalls So, I'm at a loss as what to do next. No matter what I do, I can't connect to the CM1100 through a Router/Firewall, only directly. Has anyone experienced this?
Xerloq
Jan 13, 2026 Place Cable Modems & Gateways
43Views
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7Comments
CM1100 and Mesh 6 system not working after power failure; all lights working fine
Greetings! - CM1100 modem and MR60 mesh router (2 satellites) installed June of 2021. Comcast is my ISP in the PNW and is relatively reliable historically. - Over last 4 years, I've had to power-cycle the modem and router roughly once every 2 months because the router's lights turn amber. One power-cycle of modem, router, and computer has always fixed this. - Power failure (perfectly clear night, no storm) late-evening Nov 13 for 3 hours then again for a minute 3 hours after it was back on. No info from power company why this happened, but the entire town was out. - 11/14 AM - no internet. All lights on modem and router were working as normal, so the lack of internet surprised me. Power-cycled 3 or 4 times, then powered everything down for a full hour and got it working after that. Worked fine for nearly 2 days. - 11/16 AM - no internet. Power-cycled multiple times (at least 5) over the course of 3 hours, with no luck. Noted in Windows troubleshooter a comment about swapping out cables. I swapped out the ethernet cable between the modem and router and got it working! Ordered 2 new ethernet cables to be delivered later that week. - 12/1 - no internet. I was traveling that day but noted my security cameras were all down. Sure enough, when I got home, all the lights looked fine but nothing worked. - 12/2 AM - swapped out both ethernet cables (to router and directly to desktop) - everything worked! - 12/7 AM - no internet. Power-cycled 4 times, including leaving everything off for 30 minutes. I have no more cables to swap out. I have detached all cables from both the modem and router and waited 1 hour, then re-attached. No luck. I'm understandably getting very frustrated with all of this. I am unable to access the modem via 198.168.100.1 - nothing loads at all in either Firefox or Chrome. (I'm currently using my work phone's hotspot so have perfectly functional internet on the desktop.) Likewise, the alternative site I found (10.0.0.1) brings up nothing. I have not updated router firmware in forever and seem to have no way to check what it is. I am worried this is the modem and not the router. In the past, when the router's lights turn amber, I have ethernet on the desktop via the dedicated cable. Now I have nothing, making me think it's the modem and not (just) the router. What I don't understand is why everything works for a time and then fails. Or why all the lights look perfectly fine yet there is no internet at all. Could this be related to the power failure, some sort of surge to the modem via either the power cable or the coax? Is it worth finding another coax cable to test? Pretty sure I don't have one so will need to go out and buy something. Or am I just done with these machines? I'd appreciate any info. I'm seriously considering going back to having Comcast provide equipment as much as that irks me. At least there is support that comes with that, and not just for 90 days (which is a joke, frankly). Carrie
Solved
CarrieF
Dec 15, 2025 Place Cable Modems & Gateways
361Views
0likes
18Comments
CM1100 LED Internet Infinity burnt out!
This is so annoying these LED's should never burn out. The modem is working with full internet support but the LED is not green. It is burnt out. I restarted the modem and rebooted it that light did turn orange during startup, but once connected LED was out. This makes me question buying Netgear products. Status LED's should never burn out! I am out of warranty. How do I get some compensation for replacing the modem. Thank you,
Bob5545
Dec 12, 2025 Place Cable Modems & Gateways
153Views
0likes
3Comments
Cable Modem for Xfinity (August 2025)
Xfinity identifies the following older Netgear modems as compatible for my location: Netgear CM1100 Netgear CM2000. (I do not require Voice or WiFi in the modem.) Seeking recommendations for whether I should purchase the newest available Netgear modem or should I seek one of these older models? If a newer model, are there any to be avoided?
Solved
IamJake
Aug 08, 2025 Place Cable Modems & Gateways
317Views
0likes
6Comments