configure a domain in linux

[manu balakrishnapillai]

hai friends....


I have a linux box which is used as a server for windows workgroup.. I configured samba and its working fine... Now I am asked to make it a domain becoz of security issues.. I know how to do the same in windows 2003 server.. what all i should do.. somebody help me in doing this.. I am not a  professional in Linux.. so help me

regards
manu