Cannot resolve domain from within LAN

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http://serverfault.com – I just set up a Debian server in our office. We have a business account with comcast without static IP, so I'm using DynDNS to point a domain at the machine. The problem is that I can't resolve the domain from within the network. It is my understanding that there is no way around this using the comcast business gateway, so I would need to set up some sort of local DNS (if anyone knows otherwise that would be great). I have a basic understanding of DNS, and I'm assuming that I need a setup that will resolve the domain to the local IP when a user is on the office network and use the global (HowTos)