go to machine 1st (server)and run these command
1-mkdir /share
2-vi /etc/exports
3-/share *(rw,sync)
4-service nfs restart
5-service portmap restart
6-showmount -e 1.2.3.4(your ip address=1.2.3.4 change as per ur req)
you are done on server machine
now go to client machine
1-showmount -e 1.2.3.4
2-mkdir /share2
3-mount -t nfs 1.2.3.4:/share /share2
4-cd /share2