Okay, did a google for "port number nfs", and found this link that seems useful:
HOWTO: Configuring NFS under Linux for Firewall control
This link has some information on opening ports for NFS.
That site also hosts LinWiz
, which is apparently an online iptables script-creation tool. I didn't try it, although you might want to. I briefly looked at it, and the Server configuration has options for NFS.
An alternative approach, although probably not too secure, would be to allow the workstation to accept all traffic from your server. I've never had to do this, but after consulting an iptables tutorial
and the iptables manpage, you could try the following rule in your workstation's firewall script:
iptables -A INPUT -t filter -s $MYSERVER -j ACCEPT
where $MYSERVER is a variable assigned with either the hostname of your server or its IP address.