it seems to me you are missing a point 
AD is a M$ implementation of ldap/kerberos (and dns/ntp): in linux's world, you can have it via samba4 (not available in NS)
NT style domain is quite different.. no ldap or kerberos..
so, if you try to join a mac/windows client to an AD domain using NS, you won't be able to do it and likely won't find anything on server side, since the client is failing to find the suitable services.