I have to WAN connected to mikrotik routerboard, named ppoe-WAN1 and ppoe-WAN2
I want to add simple load balancing to using tow internet connection for all lan users
the simplest way is that add new route with 2 gateway like image below,
Note that if before add this route you must delete all route with distance 1 that does not contains routing marks
and disable Add default Route
from pope connections
Having two gateways for the same destination will just put the other in redundancy. It is better that you decide on one of the following:
1. Policy based routing (PBR)
2. Per connection classifier (PCC)