Today I tried again to enable my new modem and called Comcast to get assistance with that (in case it didn't work, I needed to be able to revert back to the Comcast modem). Again, after I gave the new MAC address, the ASUS router (RT-AC1900P) displayed the message, "Your ISP's DHCP is not functioning properly." However, at that point, asked the Comcast agent helping me to send a "provisioning" signal to my modem - whatever that is. He knew what I was asking for and sent the signal. After the modem responded to the provisioning signal, my router immediately picked up an IP address and everything then worked perfectly. I hope this becomes part of the standard procedure for addressing this issue.
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