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Solved
CM 1100 no longer xFinity Compatible
The CM 1100 cable modem is no longer compatible to use with xFinity. They can no longer see or talk to the modem. On their webpage they show INCOMPATIBLE BASED ON FILTERS. Customer service confir...
The the CM has LAG support, base speed support is for 1Gb and in most cases home users don't use LAG. Even the WAN ports are only rated at 1Gb per port so technically, the CM1100 reaches this limit on a single 1Gb line.
We know the ISP recently split there speed tier last year, now 800Mpbs and 1.2Gb. Were seeing problems with some other modems that only support 1Gb on the WAN and LAN side and the ISP up'd the speed to 1.2Gb. The ISP has not certified these modems for 1.2Gb services. So this change is on the ISP side.
One thing to try, have the ISP set your speed package at 800Mpbs.
Another would be to test the CM1100 at a different location, friends or family that may have a different ISP service or speed tier and see if the modem responds differently there.
Or find something that handles 1.2Gb or higher speeds. NG CM2000 series comes to mind since those have 2.5Gb WAN port.
No Joy on any of that. xFinity says not compatible based on filters. Need to know what that means & how to resolve. This is a Netgear issue. xFinity cannot see or talk to modem like it was able to do in the past.
Cannot access modem through router (another Netgear RAX 78 product). Cannot access modem directly.
So with the modem disconnected from the ISP coax line and pressing the reset button then release and connecting one wired PC to the back of the modem with out the RAX router connected, you can't access the modem at 192.168.100.1 at all after 2-3 minutes?
OK, need to try that
thanks