Failed obtain IP address after authenticated using EAP-MD5

[Chiu Luk]

After the supplicant authenticated successfully from the FreeRadius server, my notebook fails to obtain an IP address from the Access Point (router) and end up getting a 169.254.198.216 IP address. 
 
here is my setup : 
Supplicant = WIRE1x ( a windows port of Open 1x ) 
Authenticator = D-Link DIR-655 Router  
Authentication Server = FreeRadius 
 
the setup diagram of 3 components 
http://www.oniva.com/upload/1356/diagram.jpg 
 
capture of EAP-MD5 protcol successfully get authenticated 
http://www.oniva.com/upload/1356/success.jpg  
 
but after a while, the notebook fails to obtain an IP from the D-link wireless router and end up getting 169.254.198.216 IP address. 
 
the setup of 802.1x inside D-link wireless router is like the following 
http://www.oniva.com/upload/1356/dlink.jpg  
 
so is there anything is missing on the setup so my notebook cannot get IP address from Dlink wireless router after authenticated successfully? 
 
Thank you! 
       
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