How to forward a port through two routers?

Question

Debian

The scheme is
91.91.91.91|WAN|--(1router-CENTOS)--|LAN|192.168.1.1------->----<------192.168.1.2--|LAN| (2roter-MKROTIK)--|LAN|192.168.10.1--------->>192.168.10.100 (SERVER)
How to properly forward ports on the first router so that the server can be seen from the VAN?
On the second router, the ports are forwarded, from the network 192.168.1.0 I can get to the Server. And from outside I can’t go to the server

Answer 1

Just like through one, but twice.
Provided that on the second Mikrotik you also have NAT enabled. If it is not enabled, then simply enter the server address in to-address on the first microtic.