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Version 2 of the protocol (defined in {{IETF RFC|1094|link=no}}, March 1989) originally operated only over [[User Datagram Protocol]] (UDP). Its designers meant to keep the server side [[Stateless server|stateless]], with [[lock (computer science)|locking]] (for example) implemented outside of the core protocol. People involved in the creation of NFS version 2 include [[Russel Sandberg]], [[Bob Lyon (engineer)|Bob Lyon]], [[Bill Joy]], [[Steve Kleiman]], and others.<ref name="sun85" /><ref name="Rusty">{{Cite journal |title= The Sun Network Filesystem: Design, Implementation and Experience |journal= Technical Report |author= Russel Sandberg |publisher= Sun Microsystems |url= http://www.cse.buffalo.edu/faculty/tkosar/cse710_spring13/papers/nfs.pdf |archive-date= 2013-11-26 |access-date= 2013-08-04 |archive-url= https://web.archive.org/web/20131126095851/http://www.cse.buffalo.edu/faculty/tkosar/cse710_spring13/papers/nfs.pdf |url-status= live }}</ref>
The [[Virtual File System]] interface allows a modular implementation, reflected in a simple protocol. By February 1986, implementations were demonstrated for operating systems such as [[System V]] release 2, [[DOS]], and VAX/VMS using [[Eunice (software)|Eunice]].<ref name="Rusty" />
NFSv2 only allows the first 2 GB of a file to be read due to [[32-bit]] limitations.
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* assorted other improvements.
The first NFS Version 3 proposal within Sun Microsystems was created not long after the release of NFS Version 2. The principal motivation was an attempt to mitigate the performance issue of the synchronous write operation in NFS Version 2.<ref name="usenix94">{{cite web |url=https://www.usenix.org/legacy/publications/library/proceedings/bos94/full_papers/pawlowski.ps |title=NFS Version 3 Design and Implementation |year=1994 |publisher=[[USENIX]] |author1=Brian Pawlowski |author2=Chet Juszczak |author3=Peter Staubach |author4=Carl Smith |author5=Diane Lebel |author6=David Hitz |access-date=2015-11-23 |archive-date=2015-11-24 |archive-url=https://web.archive.org/web/20151124182558/https://www.usenix.org/legacy/publications/library/proceedings/bos94/full_papers/pawlowski.ps |url-status=live }}</ref> By July 1992, implementation practice had solved many shortcomings of NFS Version 2, leaving only lack of large file support (64-bit file sizes and offsets) a pressing issue. At the time of introduction of Version 3, vendor support for [[Transmission Control Protocol|TCP]] as a [[transport layer|transport-layer]] protocol began increasing. While several vendors had already added support for NFS Version 2 with TCP as a transport, Sun Microsystems added support for TCP as a transport for NFS at the same time it added support for Version 3. Using TCP as a transport made using NFS over a [[Wide area network|WAN]] more feasible, and allowed the use of larger read and write transfer sizes beyond the 8 KB limit imposed by [[User Datagram Protocol]].
====YANFS/WebNFS====
{{anchor|WebNFS|reason=Old section name; could have incoming links, though they should probably go to the main article.}}
{{Main|WebNFS}}
YANFS (Yet Another NFS), formerly [[WebNFS]], is an extension to NFSv2 and NFSv3 allowing it to function behind restrictive firewalls without the complexity of Portmap and MOUNT protocols. YANFS/WebNFS has a fixed [[List of TCP and UDP port numbers|TCP/UDP port number]] (2049), and instead of requiring the client to contact the MOUNT RPC service to determine the initial filehandle of every filesystem, it introduced the concept of a ''public filehandle'' (null for NFSv2, zero-length for NFSv3) which could be used as the starting point. Both of those changes were later incorporated into NFSv4. YANFS's post-WebNFS development has also included server-side integration.
===NFSv4===
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