How to route between two separate MT networks

RouterOS Beginner Basics
1

Hello!
I have two separate networks with rb951-2hnd

MT1:
WAN - ISP1
LAN - 172.16.5.0/24

MT2:
WAN - ISP2
LAN - 192.168.1.0/24

I need these two separate networks to see each other LAN devices, eg. from 192.168.1.111 be able to ping 172.16.5.111 and vice versa.
I managed to connect it with a cable then I did NAT and it works in to one direction, but of course I can’t reach the other direction addresses (NAT).

Today, I tried to connect it directly on dedicated ether5 interface which is not a part of switch group (doesn’t have a master port) but I can’t ping either direction.
Static routes are on place and NAT is disabled but it didn’t work.
How do you recommend to connect these 2 networks - static routes/ or IPIP/ or EoIP?

2

On both board remove ether5 from any bridge, remove any function or ip assigned at ether5.

Put one ethernet cable between the two ether5.

On MT1 set 10.0.0.1/30 to ether5
Add this route
192.168.1.0/24 => 10.0.0.2

On MT2 set 10.0.0.2/30 to ether5
Add this route
172.16.5.0/24 => 10.0.0.1

Done.

3

I was very close to the same conclusion about taget configuration.

Thank you very much!