how to send out an Access-Challenge packet

[liug]

hi,everyone!

    I am doing a case about a radius client. I want to use freeradius to test my job.
    I must use freeradius to send out an Access-Challenge Packet.

    That is ,
                my client                          freeradius

         Access-Request ------------------------>
          User-Name= "test"                
          User-Password="Challenge"
 
                       <------------------------  Access-Challenge
                                                    Challenge-State= "adasd"

         Access-Request------------------------->
           User-Name="test"
           User-Password="abcd"
           state= "adasd"

                       <-------------------------  Access-Challenge
                                                     Access-Accept


        how can I implement this. I mean , I can send an Access-Accept or an 
Access-Reject 
        packet with freeradius,but I can't send an Access-Challenge. If anybody 
knows,please 
        tell me, thanks a lot.


                                                                                       
     liug

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