keytab question in kerberos/ldap + nfs4(home)/autofs

Hi,

I'm trying to setup kerberos/ldap + nfs4(homedir)/autofs in a mixed rhel5 and rhel6 environment. It's working, but I wonder if there is anyway that clients not require a keytab file? It is a lot maintainance work if all clients need a nfs/host.FQDN/REALM keytab.

BR, Wuming