When setting up NFS, it's strongly recommended that you use NFS version 3 rather than version 2. Version 2 has some significant problems with file locking and generally has a bad reputation for breaking certain applications. On the other hand, NFS version 3 is very nice and robust and does its job well. Now that Linux 2.2.18+ supports NFS 3 clients and servers, there's no reason at all to consider using NFS 2 anymore.