Sharing a dvd over NFS?

There is probably a way to do this, but I haven't been able to figure it out. I want to share my dvd over NFS. If I put this in /etc/exports I get an error saying that I don't have permission from the server when I try to mount it on a client: /media/dvd *(sync,root_squash,ro) Can this be made to work? -- Regards, Steven