[xubuntu] NFS behind a router

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http://ubuntuforums.org – Hello, I'm trying to run NFS behind a router though I ran into a problem. NFS server only works when the router is set to DMZ to that computer. So I was looking how to make static ports for the NFS server unfortunately it doesn't work from the guides I saw and some of them are meant for fedora base dist(/etc/sysconfig), They say to do this and that to get ports static or to lock them. When I was looking the net activity it does random ports still. Anybody know to make them static or lock them in ubuntu 9.10(xubuntu). (HowTos)