Howto Set up a DHCP Server for Your LAN
"In this short guide I will show how to set up a simple DHCP server on a Debian Sarge system whose sole purpose is to assign IP adresses, a gateway, DNS servers, etc. to client computers from the local network that don't have a static IP address. You can use such a DHCP server in your home network, your office, etc., for example if your router doesn't come with a built-in DHCP server."