NFS

Network Filesystem. NFS allows many clients to access files that is "exported" from a fileserver.

NFSv2 (RFC 1094) and v3 support are in both Linux and BSD systems, with NFSv4 support possibly being in development.

NFSv4 has a respective RFC (RFC 3530).

NFS in BSD requires portmap, mountd, nfsd all started in that appropriate order, /etc/exports also defines what clients can connect.