How to set up routing on Mikrotik OVPN?

Question

Mikrotik

There is office1 (10.22.1.0/24) connected to the head office (172.20.0.0/24) via OVPN. The office has access to the head office network. There is also office2 (10.22.2.0/24) which is also connected to the first VPN channel. Office1 has access to the office2 subnet and vice versa. How to configure the router so that the subnet of the head office (172.20.0.0/24) is visible from office2?

Answer 1

Create routes on both sides, remove firewall restrictions, if any. This topic has been raised a thousand times, the principles are always the same.
If you have three points A, B, C, there are tunnels between these points, with addressing ab and bc. It is necessary to let traffic from point A to point C through B, then you need to:
1. At point A, create routes to networks C through address b from tunnel ab
2. At point B, create routes to networks A and C through addresses a and c from the corresponding tunnels ab and bc
3. At point C, create routes to networks A through address b from tunnel bc
Also, at all points, such traffic must be allowed or not blocked in the firewall.
It doesn't matter what type of tunnels you use. (the only difference is for IPSec in tunnel mode - in this case, the scheme changes and it is impossible to let traffic through a certain point, only p2p connections. That is, in this case there will be three tunnels: ab, bc, ca)