"This document provides an introduction to NFS as implemented in the Linux kernel. It links to developers' sites, mailing list archives, and relevant RFCs, and provides guidance for quickly configuring and getting started with NFS on Linux. A Frequently Asked Questions section is also included. This document assumes the reader is already familiar with generic NFS terminology. "

For more details please refer the following links:
http://nfs.sourceforge.net/
http://tools.ietf.org/wg/nfsv4/
http://www-128.ibm.com/developerworks/linux/library/l-nfsv4.html