Opendirectory with group checking

Hello, I have successfully set up freeradius on OSX 10.5 with recent CVS version of freeradius, and am confused as to how i would only allow users within a specified group to be allowed access. Mainly, where do i define GroupName? (or am i not understanding http://wiki.freeradius.org/Rlm_ldap quite right?) -- Random quote of the week/month/whenever i get to updating it: "Opportunity knocked. My doorman threw him out." - Adrienne Gusoff "At school you don't get parole, good behavior only brings a longer sentence." - The History Boys