NFS mount problem

Hello,

I am trying to mount a NFS share on my local network, but it doesn't seem to successfully go through the ipchains rules chain. It does mount with all the rules flushed with /sbin/ipchains -F.

Would anybody know off the hand, whether NFS on RedHat 7.1 uses TCP or UDP for NFS? And what are the ports need to be opened on server/client sides.

Regards,
Sundar