Use LDAP netgroup to control NFS exports?

Hi,

I am running LDAP server and NFS server on CentOS 6, is it true that LDAP can be used to control NFS exports authentication, uid and gid setting without needing to specifie client IP addresses , anonuid and anongid on NFS exports file?

I saw some sample such as to define "/tmp/nfs2 @mynetgrp(rw,no_root_squash)" to exports file, it seems to me, you can add new user with IP address to LDAP entry anytine without updating exports file in NFS server?

If it is correct, has the netgroup schema already been defined in /etc/openldap/schema? Could anyone kindly point me a link for document or howto for the setting in both LDAP and NFS exports?

Thank you.

Kind regards.

Jupiter