Local route problem

Hello guys

we have this network.in rb 450 side we have 2 dhcp server for client and server .rb 750 and rb 450 connect together via wireless link (30 km)
we want to our client and server in rb750 side get ip from rb450.so we use eoip tunnel and bridge it with port
now problem is when clients in rb750 side want to ping server in rb750 side because dhcp server and gateway is in Rb450 side , our request go to rb450 side and come back so our ping time go up