NFS: RFC 1094 for v2 (3/1989) RFC 1813 for v3 (6/1995) like “one Internet” Can cache whole files over long periods
The mounting and locking protocols have been incorporated into the NFSv4 protocol. The server also listens on the well-known TCP port 2049. As such, NFSv4 does not need to interact with rpcbind [1], lockd, and rpc.statd daemons. The rpc.mountd daemon is still required on the NFS server to set up the exports, but is not involved in any over-the-wire operations. How to Setup NFS Server (Network File System) On Redhat Apr 25, 2020 Sharing & receiving files over the internet from Synology Oct 03, 2017
NFS Locking. Locking files over NFS protocol is not enabled by the default configuration. There may be certain circumstances when you may need to have the file locking feature on your NFS mounts, just as in the local file system. To achieve this, you have to enable rpc.lockd(8) and rpc.statd(8) on both NFS server and its clients.
Chapter 8. Network File System (NFS) Red Hat Enterprise
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