W2k Server w/2 NICs

I have W2k Server with 2 NICs – one public, one private. Public NIC is set to get TCP/IP info from my ISP. Private NIC has fixed non-routable IP and proper subnet mask. When I set up DHCP on this server using MCC snap-in, the IP address of the DHCP server that pops up is the IP of the public NIC. IF I try to force it to the IP of the private NIC, I get an error saying Server can not be found. After doing a refresh, the public NIC IP pops up again. I have same problem with DNS and WINS. I want all three to be on the private NIC side. How do I set this up? I am sure this set up is done every day. I must be doing something wrong.