How to forward ports from Mikrotik to get hooked with Zyxel Keenetic lite III?

Question

VPN

Good day to all!
There is network A (Mikrotik) - LAN 192.168.59.0/24, white IP
There is network B (Zyxel Keenetic Lite III) - LAN 192.168.1.0/24, gray IP
Task: get into the Zyxel control panel (network B), referring to white IP Mikrotik (network A)
In network A, I set up an L2TP / IPsec server, to which Zyxel connects from network B. (after connecting, it receives IP 192.168.59.145 in network A)

Routes on Zyxel and Mikrotik (spoiler)

Маршрут на Zyxel (сеть Б)

Маршрут на Mikrotik (сеть А)

Actually, it goes from network A to network B and back without any problems, but port forwarding to network B does not work

Port forwarding on Mikrotik (spoiler)

Suspected problem: Zyxel receiving packets does not know where to respond and responds externally.
But how to teach Zyxel to respond where necessary - I don’t know yet, please help with advice
UPD: the correct answer is DST-NAT to another subnet for mikrotik?

Answer 1

/ip firewall nat add action=netmap chain=dstnat comment=Zyxel disabled=yes dst-port=51413 in-interface=internet_out protocol=tcp to-addresses=192.168.59.145 to-ports=
80 !