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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This error message appears in the router when I try to hook up a new modem. I've called in two times to try to resolve this, without success. The solution appears to be for Comcast to send a provisioning signal - whatever that is, but it appears that the techs on the phone I've interacted with aren't up to speed on this. Also, for the record, I have two Asus routers and when I tried to connect either one of them to the brand new Netgear CM1000 modem, I got this same error, so the likelihood that it is a defective router issue seems vanishingly small. If anyone at Comcast can address this, it would be greatly appreciated.
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