Difference between Auth-type=System and Auth type=Local

[ys.hsia]

HI:
    I amm a beginner of Radius and use NTRadPing to test . 
    I am confiused with what is the difference between setting of user in user_conf of
    Auth-type:=System and Auth-type:=Local.

    If I set a user  with             Auth-Type :=  Local  in user_conf,   Radiusd  it will 
    reply with Access-Accept.
    If I set a user with  Auth-Type :=  System in user_conf , Radius will reply with
    Access-reject.
    Why ? any \one can help ?
    Best regards, 
Hsia

  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freeradius.org/pipermail/freeradius-users/attachments/20060831/e66986be/attachment.html>