Model 450G.
On one side are 4 different ISP, the other one. I would second mikrotik connect to the first with four l2tp tunnels. But in this case, traffic will go only through the main gate and work will be only one tunnel. How to solve this problem?
ask the same question differently:
how to configure routing on interfaces, well, that is, on what interface the package came - and went with this instead of the default gateway?