mutiple lans behid mutiple pppoe-clients single WAN

i have an RB750 with a single wan port (ether5), i need to set this up so that three separate pppoe-clients can run with a separate dhcp server for ether 4-3

ether5-wan
pppoe-client4-ether4-dhcp server network 4
pppoe-client3-ether3-dhcp server network 3
pppoe-client2-ether2-dhcp server network 2

not sure of the best way to do this, though maybe 3 meta routers.

your thoughts please?

so, you need pppoe-clients on ports 2,3,4 and dhcp servers on ports 3,4?..

just add them =)

pppoe 1,2,3 on port 5, dhcp server on port 2,3,4

so, the problem is several pppoe clients on one port?.. then yes, either metarouters or maybe VLAN switch with perverted config and many patchcords to have three VLAN interfaces on the router, and they see one broadcast network %)