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Solved
Have interneet with modem/router, but no when plugged directly in modem
Have some basic equipment for my internet. A CM700 modem, a R7000 router. Have internet connection with the following setup: Xfinity => CM700 (modem) => R7000 (router) =(wired)=> PC I want to te...
When you directly connect your pc/laptop to the modem, the isp doesn't automatically reassign the ip address if it isn't powered off.
So power off the modem (and the laptop/pc). Give it a couple minutes. Then power on the modem without a device connected to it.
Once its fully booted, then connect your pc/laptop and power it on. Give a bit to fully boot.
That should get you a connection.
In terms of the modem not having a speed test, its not a router. Its a modem only device. I've got quite a few modems (from several companies) and none of the modem only device have any speedtesting built in. Again, they're modem only device.
When you directly connect your pc/laptop to the modem, the isp doesn't automatically reassign the ip address if it isn't powered off.
So power off the modem (and the laptop/pc). Give it a couple minutes. Then power on the modem without a device connected to it.
Once its fully booted, then connect your pc/laptop and power it on. Give a bit to fully boot.
That should get you a connection.
In terms of the modem not having a speed test, its not a router. Its a modem only device. I've got quite a few modems (from several companies) and none of the modem only device have any speedtesting built in. Again, they're modem only device.
Thanks for the quick reply.
So I did that. Plugged the Ethernet cable from my PC directly to the modem. Waited long enough to power off/on the modem. Still my PC is unable to connect. Just to note I did not reboot my PC. Thought it was unnecessary, and had work there so couldn't at the moment.
When I plugged the router back into the modem, it does take a reboot of the router to re-establish the connection.
I will have to find time later to do more experiments.
Meanwhile, Comcast has agreed to send someone over to take a look of the connection cables. It's an old house. We'll see.
Note
had checked out another case:
which seemed to be the opposite of my situation. Not clear its solution will apply to mine. But interesting. But plemans seems to be actively helping people. Thank you.