Multi wan gateway routing ? (packet marking ?)

[zoummuoz]

Hello everyone and thank you for your interest and expertise.

I am trying to implement a multi wan gateway routing, multi vpn with PFSENSE.

Vpn are under the Treaty Linksys RV042 router.

The objective is to make backup links

RV042 –------ ===== VPN1 ====== RV042
LAN1 pfSense -------  RV042 -------- ===== VPN2 ====== RV042 -------- pfSense ------ LAN2
                                  RV042 -------- ===== VPN3 ====== RV042

To do this I use the rules by assigning a gateway in the advanced rules (eg from LAN1 to LAN2 port 80 is use gateway VPN1, same but reverse LAN on the other pfsense ...)

Before going under pfSense I used the packet marking with IPTABLES ...

My concern today is that a packet sent from LAN1 to LAN2 via the VPNx hand on the correct link, but when it returns, pfSense does not know who has apparently transmit ...

MY QUESTIONS :
PfSense he is able to help me?
Is what I use the right method?
What I do not understand?

Thak's for your interest.