How do I route a WAN IP to a PPPOE Client connected to an Edge router?
Here is a diagram that explains it all
From my understanding you should just have to use a NAT rule to forward all traffic for the WAN to the IP of the pppoe client then a NAT rule to translate all traffic from pppoe client to the specific WAN IP.
/ip firewall nat
add chain=dstnat dst-address=45.45.45.2 action=dst-nat to-addresses=10.2.0.11 comment=WAN-TO-PPPOE-CLIENT1
add chain=srcnat src-address=10.2.0.11 action=src-nat to-addresses=45.45.45.2 comment=PPPOE-CLIENT1-TO-WAN
add chain=dstnat dst-address=45.45.45.3 action=dst-nat to-addresses=10.2.0.54 comment=WAN-TO-PPPOE-CLIENT2
add chain=srcnat src-address=10.2.0.54 action=src-nat to-addresses=45.45.45.3 comment=PPPOE2-CLIENT-TO-WAN