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I think the the CM1200 has fallen off their list
With Comcast anything is possible… I think the the CM1200 has fallen off their list. I’ve been struggling to get connection back to where it was. While they say everything looks fine on their end and the cable tv works fine I’ve got devices struggling to maintain connection. My router was old so they recommended updating that along with new coax cables. I did all that and new splitter too along with an RAXE300 router. Things still aren’t working right so I’m wondering if it’s the modem that I just bough my 1 year ago.
The connection is there but Netflix is pixelated and slow to get up to 4k crispness, Xbox struggles with ipV6, nat etc but will connect after going to advance settings (delay with the network numbers loading) look normal, play ok but shows broken connection test results with high packet loss, no upload result etc. On the Xfinity account page it does have an alert about the modem not being found but not sure if that’s just because it’s 3rd party and not one of their devices.
At a loss and need to get NETGEAR support at this point. ???
23 Replies
What Firmware version is currently loaded?
Please post a copy and paste of the modems connection status and event log page.
https://kb.netgear.com/30007/How-do-I-obtain-the-cable-connection-information-from-a-NETGEAR-cable-modem-modem-router
https://kb.netgear.com/30008/How-do-I-view-or-clear-the-event-logs-on-my-NETGEAR-cable-modem-or-modem-routerBe sure your using a good quality LAN cable between the modem and router. CAT6 is recommended.
Are you streaming via wireless or wired ethernet to your streaming device?
Can you connect your streaming device directly to the Modem with out the RAXE in the mix to see if streaming is not pixelated? Help rule out the modem or router here.
Do you have IPv6 setup and Auto on the RAXE router?
How do you have the RAXE router connected to the CM series modem? Using the Yellow WAN port in back of the RAXE router?
As of Nov of last year the CM1200 was still on there supported modems list:
Here is a more recent list:
On the recommended list for connection to the Comcast standard network. The CM1200 does not yet have the certified firmware to connect to the Comcast enhanced speed network with the 100/200 Mbps uploads.
Hello thanks for the reply…Some background…
Up until we started having issues I was running a Netgear Nighthawk R7800 router that worked fine with none of the current problems. Comcast techs had me restart modem and checked connection/diagnostics on their end, all looked good. They suggested changing coax cable and replacing router due to age. Using a mix of Cat 6 & 5e cables… 5e is what came with the new RAXE300 router. I did a factory reset of the modem… rebooted, attached router on the 1GB yellow WAN port (it updated to LATEST FIRMWARE V 1.0.8.64_3) and added every device one at a time assigning LAN addresses with Mac laptop wired. I let the router auto configure everything… Netgear Armor is OFF.IPV6 I’ve tried a few things but hard to nail down which is best… Old router worked fine with DHCP. For the new one I started with auto config. Auto detect actually shows a 6 to 4 tunnel. It’s on DHCP currently with DNS get auto from ISP, LAN IP address assignment set to Use DHCP Server. Speedtests usually check out fine on my Mac laptop wired or WiFi… but I’ve had issues with wife’s PC laptop staying connected and we’ve both had issues with slower Cisco Any Connect VPN for work at same company.
When I goto Xfinity account page on web or the app I get images showing the modem is offline. However when I got home today I tested Netflix (on 5G Wifi) and Xbox Wired and both can get online but still have issues when connected to router. Arlo camera is connected to network but getting connection to it at home or remote is near impossible now (it worked fine on old router). If I get a Live feed sound is choppy. Extreme cold weather could be affecting it as well. Netflix had pixelization. Xbox partly logs in but shows “connect to xbox network” tab. I go to Network Settings, then advanced and all the network data loads and it connects. Network Statistics are still broken, Online/Offline status slow and hangs.
I then tested the LG TV direct to the modem… Modem reboot with LG TV Cat6 wired and Netflix plays with crisp picture, no pixels. Orange blinking bottom network light.
I then tested the Xbox direct to the modem…Modem reboot direct to Xbox with same Cat6 wired. Connected fine, green network light blinking. Ipv 4 & 6, NAT Open. All services available. Network Stats actually completed: 1085 DN (Higher than usual), 13.15 UP (can go as high as 17/18), 2% Packet Loss (0% was the norm), 1480 MTU, Latency 61ms (32-34 is usual). Online/Offline status quicker, not hanging. Not sure what the ”Dead Beef“ is in the Ipv 6 gateway??? Will have to ask Comcast about that!
I then rebooted modem, attached router again with same Cat 6 cable… Noticed lease times dropped off again to 1-2hrs versus 20-24 previously. Before that on old router they were several days. Tested Netflix on 5G Wifi and it appears to be working better, 1st show was fine, some pixels on 2nd show but cleaned up quicker. Xbox connected fine and shows as normal but still has broken Network Stats with packet loss.
Below are the modem stats for the reboot with router connected.
