NFS-mount thru firewall

Hello, I have the need to mount a NFS-volume through a firewall. Sadly I was not able to find the ports to open and therefor I'd like to ask you wether anybody can answer the following question: Is SuSE-FW2 able to enable NFS-ports (login from my LX-box to the server) in a way that the MAC-adress is checked and the port is only available to this machine? This would shorten security risks I guess. Is there any alternative to this ? -- Freundliche Grüße kind regards Ingo