No Calling-Station-Id in Auth-Request

hey guys I have been trying to authenticate user based on mac-address. But the problem is my pppd is not sending the mac address of clients in it's Auth-Request. I'm using following softwares: (i) rp-ppoe (ii) pppd-2.4.1 (iii) ppp-2.4.1-vanilla-radclient-v2.1.patch (iv) freeradius-1.0.2 Can anyone tell me how to send the mac-address of the client in the Auth-Request as Calling-Station_Id or anyother attribute/value pair. Thanks in advance Open