Thanks for the support!
After your advice routing was ok, but clients that are behind pfsense respond only to the ping…
no http, no ssh, nothing!!!!
I thought it was some sort of firewall rule, but the problem was that pfsense is on a VM (kvm on very old proxmox1.9):
solved with this
https://doc.pfsense.org/index.php/VirtIO_Driver_Support
Tanks