OpenVPN client (site-to-site) through a OpenVPN Scaleway InstantApp

[adrenalinedj]

Hello,

I've purchased a Scaleway's OpenVPN InstantApp: it configure a OpenVPN server automatically.
It generates me a TUN client with TLS cert/ca/key.

When i use it on my machines with some openvpn client apps, it works well : it connects and all traffic goes through the tunnel.
When i setup the client in pfSense, it connects to the server but internet traffic does not go to the tunnel.

Here is my setup :

• 2 WAN interfaces over PPP with a multi WAN gateway which is setup as a failover : when 1 is down the other is used.
• CA and CERT are setuped in System > Certificates
• OpenVPN client is setup according to the ovpn file generated by the server and is select the MultiWAN gateway as interface.
• An alllow all firewall rule is setup in the OpenVPN tab in Firewall > Rules

With this setup, the OpenVPN client connects well to the server but internet traffic is not redirected through the tunnel even if i have "redirect-gateway def1" in Custom options.

What I tried (following several guides) :

• Creating an interface specifically to the OpenVPN client
• Creating Nat Outbound rules for this interfaces by copying thos generated for the WAN interfaces
• Creating a another MultiWan gateway which uses OpenVPN interface by default and the other 2 WAN interfaces as failover.

Nothing changed, client is connected but no internet traffic goes through it.
What am I doing wrong or miss ?