DNS / DSL Issue with Administrative Tool

I am rolling out a domain using one Windows 2000 Server as DC and one member server, the workstations are Windows 2000 Pro. We use DSL service to connect to the internet. I find that in order to connect to the internet I must configure TCP/IP settings so that the DSL IP address is in the Preferred DNS Server and the Windows 2000 Server is the Alternate DSL Server. Sure we can log onto the domain and access the internet but I am unable to use Administrative Tools or MMC components that connect to the server. In order for me to use Admin Tools I must switch the DNS IP address to the Windows 2000 Server. When I do this I am unable to access the internet. Apparently there is a DNS issue, could someone point me in the right direction?