I created a small network,the topology is:

RB450G become server who takes care of hotspot user auth, so the router activate dhcp server, radius and user manager, there are 2 because I tried the VRRP,
VRRP IP: 192.168.1.1/24
Ether1 IP (connect to 433): 192.168.2.1/24
RB433 become AP WDS
Bridge IP: 192.168.3.1/24
Problem: When enable DHCP server in 450g (block 1/24 and / or 2/24), there is no client who then lodged, at lease the list is empty, a message in the debug log is “unknown giaddr”. Then I try to give the IP 192.168.1.2 / 24 and 192.168.2.2/24 in ether1 RB433 which connect to 450g, the client can get IP, lease is charged, but the user can not do anything , gateway is 192.168.1.1 at user side,
is there any solution?