firewals package and NFS

Hi! I've got a little problem with the firewals package. Everything works fine but now I want to import filesystems from another computer in the LAN but it seems to me that the firewal is denying all TCP/IP packages which should be send to the network. So my question is: Which services must I allow in rc.firewall.conf that NFS packages get through the firewall? (I'm using SUSE Linux 6.3 with Kernel NFS) Thanx Benjamin Jungbluth