Cable Modems & Gateways

Discuss Cable (C and CM series) modems and gateway products.

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Discussions

Battery Backup Failure - C7100V – Nighthawk AC1900 WiFi Cable Modem Router With Battery PB022
I have a C7100V – Nighthawk AC1900 WiFi Cable Modem Router with battery backup Model PB022. I purchased the battery almost two years after I purchased the cable modem router. I mention this is only t...
Ozcrome
Dec 14, 2025 Place Cable Modems & Gateways
Troubleshooting
1.4KViews
1like
3Comments
CAX80 v5.1.1.8 Firewall Blocking HTTPS API Traffic - DMZ Confirmed
Hi all, I'm experiencing a firewall bug on my CAX80 (firmware v5.1.1.8) that's blocking HTTPS API calls to legitimate services (specifically api.anthropic.com for Claude AI/Claude Code). Symp...
Solved
brief-actuator
Dec 14, 2025 Place Cable Modems & Gateways
cax80
51Views
1like
10Comments
Reliable cm1200 suddenly dropping on Comcast
I bought this modem a few years ago and it's been rock solid until the past week. I started noticing waiting icons as the internet seemed to have issues. In the early morning hours I get notices that...
sam452
Dec 13, 2025 Place Cable Modems & Gateways
cm1200
41Views
1like
5Comments
CM1200 suddenly dropping on Comcast
I am suddenly having the same issue. Have to turn the modem off, wait a minute then turn back on. It's good for a bit, then it happens again. Times are totally random that it goes down. All lights sh...
Off2Geo
Dec 13, 2025 Place Cable Modems & Gateways
cm1200
43Views
0likes
13Comments
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 d...
Bob5545
Dec 12, 2025 Place Cable Modems & Gateways
cm1100
23Views
0likes
3Comments
NOTICE: New - CBR750 Firmware Version 4.6.14.8 Released
Get it here: New - CBR750 Firmware Version 4.6.14.8 Released | NETGEAR Communities Be sure to keep any and all RBS750 series satellites at the same v4 version level. RBS750 v7 FW is NOT compa...
FURRYe38
Dec 10, 2025 Place Cable Modems & Gateways
cbk752
cbr750
8Views
0likes
0Comments
NOTICE: CM3000 cable modem v6.01.04 Firmware Released
Getting some reports that this version of FW is being seen on CM3000 series modems from CC/XF ISP. Not sure if other ISPs will be seeing this. Maybe at some point. This seems to follow up on la...
FURRYe38
Dec 09, 2025 Place Cable Modems & Gateways
cm3000
176Views
0likes
11Comments
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 p...
CarrieF
Dec 08, 2025 Place Cable Modems & Gateways
cm1100
45Views
0likes
2Comments
I have a Linksys Mesh and am looking at getting a CAX80
I have a Linksys Mesh and am looking at getting a CAX80. What does running the mesh system in "access point mode" mean - to a non -techie. Thanks,
HoundDogMama
Dec 06, 2025 Place Cable Modems & Gateways
cax80
56Views
0likes
2Comments
Nighthawk cax30 Control panel access failure.
I've successfully registered the MAC address with Xfinity and now have internet access, however 192.168.0.1, 192.168.1.1 and "routerlogin.net" do not work on ANY device. "Server not found" is all I'm...
Solved
Riversiderepeat
Nov 26, 2025 Place Cable Modems & Gateways
not listed
63Views
0likes
8Comments