Two IP subnets in one Domain

We were connected to the Internet through a Leased Line. Within our LAN, I used private IP (192.168.0.X), but some machine on the network were using real IP, such as the newly setup Win2K servers and few of the workstations. After AD services have been set, all workstations using private IP can’t login to AD. I don’t want to assing real IP to those workstations, and this is impractiable to assign all workstation with real IPs.
How can I make all workstations and server can be login to the domain regardless what kind of IP addresses are using?