i want to know how can i set up my hole network to root to i dhcp server

so i want my tower to forward to my server and to let my server to do all the work and not my tower
can anyone help me with this

1----------2--------------3----------4---------5

one is the server

and 5 is the end user client
i want my end user client routerboard to get is ip address from my server and not form no4

can it be set up like this

i know it works with the dd-wrt softwer

Easiest thing would be to bridge your AP's

but if i have a pppoe connecting to no 5
will it move to 4 if i bridge out ap 5??????

A tunnel, dhcp relay, bridge, mseveral ways, look at these topics in the manual.