Netatalk and users

Hi, I'm a newby having some small problem with Netatalk(
netatalk-1.5.5-6
On Linux RedHat9.b ) and user authentication...

I just started netatalk with /etc/init.d/atalk start and modified the
AppleVolumes.default file with the following line:

/DiscoDati/share/user13 "user13" access=user13
/DiscoDati/share/user12 "user12" access=user12

Then I created the directory tree with the 777 rights and added the
userX user.

The problem is that, when I do a succesful login I can access both of
them, with no regard of the user I used for the login...

The other problem is that on the resource list I dont see user12 and
user13 but instead access=user13 and access=user12 .


Any help ;-)?
Vincent.