3xrb1000 and l2tp routing problem

RouterOS General
1

I all.
I have three rb1000 connected to internet (Rb1, Rb2, Rb3) by their eth1.
Each interface have a public ip address P1, P2, P3.
Rb1 have a pppoe interface connected to internet.
I have three servers (Sv1, Sv2, Sv3), connected to eth2 of each RB.
Each server have a private address Rx2 (x=1,2,3) and gateway Rx1.
I created two L2tp tunnels T2 and T3.
This is the schema:
Grafica1.jpg
I tried to route but I cannot achieve packets flows from R22 and R32 to R12 without they where src/dst natted.

Can someone help me ?

thanks

2

does RB1 knows the routes to R22 and R32? show us traceroute from Sv2 to Sv1 and vice versa, for example