PROBLEM - Proxy + SQLIPPOOL + Framed-IP-Address

Hi, Doing proxy, freeradius always ignore the static Framed-IP-Address set in radreply table and sets the random SQLIPPOOL instead. Without proxy, SQLIPPOOL won't assign an IP from the pool and grabs the Framed-IP-Address correctly. I guess it's because the Framed-IP-Address = 255.255.255.254 contained in the Access-Accept packet from the proxy home server. Played with attrs but no luck. Please help! Thanks!