I declared a new attribute on FR dictionary, called CarboSolutions-NotBefore. This attribute should contain the data time as a string before what the user should not be able to authenticate. That attribute is placed in radcheck table (like: CarboSolutions-NotBefore >= 20120801). I tried to deal with that following some threads from that forum on similar issues, that sooner or later leads to unlang procedures. I also read the unlang's man page. But I can't understand how to deal with unlang. Can anyone help me to obtain what I need? What I need: I need that every authentication request, should contain an CarboSolutions-NotBefore field with current date. If you have other better approaces for what I need, feel free to suggest me. N.B. I get inspired especially from that<http://freeradius.1045715.n5.nabble.com/Temporary-Accounts-td2756199.html#message2756205> post.