How to forwarding MAC Address for hotspot?

Hi! I’m trying to implement this :

ISP → Front FW(RB450G) → Back FW (CCR1009) → eth0 RB951 → Clients

My Hotspot server is on my CCR, but if i set address per mac, the clients can’t login. After i checked, the client’s MAC address is not detected by CCR, the CCR only know my RB951 eth0 MAC addess.. how can i forward client’s MAC address to CCR?

I’ve tried to use bridge at RB951 eth0 (connect to CCR) & eth 2 (connect to clients) but CCR only detect MAC address of eth 2 of RB951..