Mikrotik: how to properly isolate subnets?

Question

Mikrotik

There are 2 Mikrotik RB 3011, an l2tp tunnel with IPsec is raised between them, NAT rules are configured, everything works, everything is fine, but on MT1 there is a subnet 192.168.1.0/24, on MT2 there are subnets 192.168.1.0/24 and 192.168. .
Question: is it possible to isolate subnets 1.0 and 100.0 on MT2 from each other and direct traffic from MT2 from subnet 100.0 to network 1.0 through the l2tp tunnel on MT1?

Answer 1

1. The intersection of networks can be resolved. But this is a complication out of the blue. Catch traffic from 100 and tint its routing mark.
2. It is possible to isolate traffic flow not only on the basis of src/dst-ip, but also on the basis of the interface.

Answer 2

MT2 from subnet 100.0 direct traffic to network 1.0 through l2tp tunnel on MT1?

Okay Google, routes for the little ones.
Set up masks, you can also use routes (turn traffic there to nowhere).