Simultaneous-Use Issue

I have freeradius 1.0.5 installed my end-users are able to login simultaneously using the same username and password, the radacct table is recording the aggregating session time that the multiple simultaneous users use. in my radcheck table I have all my users login attributes set to: User-Password = somepassword Max-All-Session = 123456 Simultaneous-Use := 1 Is there extra attributes that I need to set or configuration that I need to add in order to not let the same user login simultaneously through different machines? Thank you, James