Trying to setup TC to the internet (Comcast modem) and does not connect.

I'm replacing my old Netgear WiFi router with the TC. The provider is Comcast via their modem but, after setting up TC it does not connect to the internet. Of course Comcast service doesn't answer. I've tried the usual, unplugging the modem and TC and reconnecting, then resetting, etc, no connection to the internet. Do I need to directly bypass the WiFi router to start and connect the computer first and capture the DNS settings? Comcast usually does that automatically. After that connect TC to the modem and then manually edit settings? What settings use I edit?

Is the comcast modem a pure modem or also a router?
If it is a pure modem.. the TC must be in router mode.
If it has been used in another setup or is just being difficult .. reset the TC to factory and start over.
It is simply in DCHP and NAT for network setup.. it should get an IP and share it by default.
Normally you need to turn off the modem for several minutes to make the ISP gateway give up the MAC address of last connected item.
Tell us the exact model of the modem if the above doesn't work.
Is the TC new one?

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Trying to setup TC to the internet (Comcast modem) and does not connect.

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