NFS cache permissions

[Bruno Galindro da Costa]

Hi yall,

Is it possible to clear the nfs cache permissions? I´m asking this because
I´ve made a NFS share with client access restrictions and the users that
have no more permissions, can still access the share.

The share has the following permissions (2770):

    drwxrws---  5 nobody vmail  1024 Nov 12 09:47 email

Only users that are within the vmail group can access the share. The
/etc/exports file has the following content (192.168.1.22 is the client´s IP
address):

     /mnt/vol0/email
192.168.1.22/255.255.255.255(rw,anonuid=5000,anongid=5000,secure,root_squash,wdelay,sync)

On the client, I´ve created a vmail group with the same UID of the server
(5000), and mounted the exported filesystem with the following command
(192.168.1.1 is the server´s IP address):

     mount -t nfs -o rsize=8192,wsize=8192  192.168.1.1:/mnt/vol0/email/
/email/

Right after executing the above command, I´ve added a user (abc) in the
vmail group and that user can access the share perfectly. So far so god.
BUT, when I remove that user from vmail group, logoff and logon again, the
user still has access to the share!
After unmounting and remounting the NFS filesystem, the user still has the
access!

Is this because the client computer has a NFS cache permissions? If yes, how
can I clear that cache?

PS.: After reading this - http://nfs.sourceforge.net/ - I´ve mounted the
share with the option "noac" to prevent client's file attribute cache. But,
it isn´t working.
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