Having installed NFS on a v6 box, I seem to remember needing the portmapper as well as the nfs rpms (standard RedHat v7 rpms were fine from rpmfind.net). You also need to alter your /etc/hosts.allow (and it's e-smith equivalent) to let local clients use portmap. Once it is working, you also need to create links to start the portmapper and nfs daemons in (from memory) rc7.d.