You'll need to set up libpam-ldap (it may be called something else in CentOS) for pam to perform authentication. You'll also need libnss-ldap to resolve usernames
Thanks a million for the quick reply. Do i need to modify few files or is there some handy tool for doing this stuff. I am not able to find a suitable doc by googling the web :(
It's been a while since I've looked it; I can't tell you if there is any easier way to do it. There are various documents on the WLUG wiki (edited by myself and others), but these were all focused on debian based systems, and are sadly out of date. Your LDAP server is possibly overkill. If all you want to do is provide multiple user accounts, then you don't need LDAP at all. You may find the the LTSP (Linux Terminal Server Project) more use - it's packaged together to do what you want. It even supports freenx, it seems (although freenx isn't the only way to do remote X logins) Wlug wiki: www.wlug.org.nz LTSP page: www.ltsp.org