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If your department is setting up a .gov domain, the dotgov.gov folks (the registrar for .gov) want the authoritative name servers from which you will be publishing all of the DNS records for the zone. The DNS servers you see when you look at a computer's network configuration or your Comcast cable modem are the recursive resolvers that look things up for you using DNS authorities from across the Internet. Both authoritative (publishing) and recursive (lookup) are DNS servers, but opposite ends of the DNS ecosystem.
So, this is a business question, and only a Comcast business question if your department gets its Internet connectivity through Comcast. In short, you will have to use authoritative DNS servers that are provided with your network connectivity, are provided under separate contact, those you set up yourself, or those of a parent or sibling department or agency within the government that you are permitted to use.
If you're a business class customer, you need to be posting in the business class forums. This is for residential services.
Our Department is attempting to set upa .gov domain address. When we attempt to answer the registration question for the nameserver it keeps getting rejected. I have tried our local network DNS address the DNS address found in the comcast router and al have been rejected.