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CM1200 speed issue with Xfinity Gigabit service
Hello, I have gigabit service with Xfinity, and I did a speed test and pulled 950mbs, instead of renting the XB6 I purchased the CM1200, now my speeds are ~450MBps. I did not configurations on th...
No, for the CM1200, only LAN port 1 is to be used with a single NAT router behind it.
Lan ports 1 and 2 support Link aggregation which you need a LAG supporting router to beable to take advantage of this feature. R7960P or R8000P which support LAG.
The other ports 3 and 4 are for ISP static IP assigned addresses mostly seen in business class environtments.
So for basic home needs, if you don't have a LAG supporting router, disable LAG on the CM modem and connect your main host router to port #1 only and leave the others disconnected on the CM modem.
Hi,
Thank you for your response! I have a switch attached to port 1 of the CM1200, and another switch is attached to that switch, but all other ports on the modem are empty and all lights are green.
I have tried a direct connection to the computer and modem, didn't help. I am not running wireless, only wired.
You need to move the switches OFF the modem and connected them behind a router.
I would reset the modem and setup from scratch with a NAT router connected at Port #1. Have a wired PC connected to the NAT router. Might need to reset the NAT router and setup from scratch.
I have this same modem, tested it for NG. Works well with my R7960P router, both in single port #1 and LAG modes.
Thank you for the feedback! What if I do not need a wireless router, any other recommended routers?
For any CM modem, since these do not have any router or wifi functions, you need some form of a NAT router. Modem>Router>Switch<Lan connected devices to switches or directly to Router. This is standard networking connection configurations.
Most any router will work. NG Orbi, R or XR series routers. You can see my tag signature for routers I have that work with the CM modems I have.
Most router now days come with wifi built in. If you don't need wifi, then you could try Ubiquity's Edge Router X as it's a wired only router. I have this router as well. No wifi. I believe they have a few models with out WiFi. NG and other router Mfr have the built in wifi routers now days.