An NFS server is configured by including the appropriate modules in the Linux kernel, by writing an /etc/export file, and by adding the remote hosts to the /etc/hosts.allow file.
Configuring an NFS Client is actually somewhat more complicated. Besides running the nfsd, rpc.portmap must be running, and /etc/hosts.allow must specifically open the interface IP address if it is a dedicated NFS channel (is that true? it was in my case...)
To Be Continued!!