I want to use memberof overlay but I do not have a clue on how to even look at it.

I want to use memberof overlay but I do not have a clue on how to even look at it. I have tried to use this: http://www.schenkels.nl/2013/03/how-to-setup-openldap-with-memberof-overlay-...

which kind of worked and it has added something to my database. Now I have tried to run some search but either I am doing something wrong or the memberof is not loaded.

So first, how do check that it is loaded? I was thinking about : ldapsearch -x -H ldap:/// -b cn=module

but again I am unsure since it won't give results. I am trying to use memberof for squid to match a group membership. Any hints? directions to understand?

I understand the basics of LDAP but this is something above basic LDAP.

Thanks, Eliezer