Windows 2000 & Unix Systems

We have AIX RS/6000 currently setup as a workgroup and serving as DHCP/DNS. We have installed Win 2000 Adv Server on the same subnet but users cannot login to Win 2000 due to all workstations obtained their IP from UNIX DHCP/DNS. How can I use Unix DHCP/DNS with windows 2000 which will allow users to login to Win2000? We have purchased Services for Unix 2.0 but need to resolve this IP assignment and login problem ASAP. What should I do? Please Help!!!