quotas on nfs share

[Aldo Foot]

I cannot enabled quotas over NFS.
I spent some time on this and eSearched but I've hit a bump.

I have a CentOS 5.3 server with a filesystem configured with
quotas. Quotas works locally. I've exported this filesystem to a client.
The client is an F11 machine on which I can mount the export,
but cannot enable quotas on the mount.

The rpc.rquotad is running on both ends.

Is it possible to enable quotas over NFS with CentOS/Fedora?
Some other people claim they've done it with Ubuntu.

Any ideas, links, pointers appreciated.
~af