ARRIS Group, Inc. TG1682G less than a year old. This is what everyone has in Denver, as far as I'm aware. Most of the devices settings aren't managable by its own web interface, I have to go to xfinity.com/myxfi and login to the account, and then it pushes changes to the cable modem/AP. This includes the login password for the device's web interface. Thoroughly screwy in my opinion.

Anyway, there is a Connection > Local IP Network. But no DNS settings anywhere.