NFS-Server and Firewall

Hi list, i have to set up an NFS-Server. I want to protect this server with SuSEfirewall2. The question is: What ports do I have to open? Of course I have to open port 111 (udp,tcp) and 2049 (udp,tcp). But that seems not to be enough. Everytime I try to connect to the server the client conntects to some other (randomly choosen?) ports (608, 922, 1024, ...). Do I have to open a range of ports? If so, what range I have to open? Thanks and greetings Florian