If all you’re trying to do is change IPs on a port forward rule in NAT, there is no need for that. Just replace “dst-address=a.b.c.d” with “in-interface=pppoe1-out”.
with “in-interface=pppoe1-out”,there are some problem when visit internal server by external ip from client behind routeros.
so i do port-map whit dst-address.