Starting with the Oracle Solaris 11 release, the NFS client uses only one UDP (User Datagram Protocol) reserved port, which is configurable. The system can be configured to use more than one port to increase system performance. This capability mirrors NFS over TCP support, which has been configurable in this way since its inception. For more information about tuning the NFS environment, see Oracle Solaris 11.2 Tunable Parameters Reference Manual .