traffic through pptp client not passing

hello,
i’m having a somewhat simple yet frustrating issue:
i’ve setup a mikrotik box as a pptp-client concentrator(it will dial several PPTP client connections and route that traffic for the LAN), the pptp interfaces run ok, i’ve added specific routes for each pptp remote network, and ping from the mikrotik itself work…but not through lan.

example:
lan ip 10.10.10.16/24
pptp client 1 IP: 11.50.1.5 concentrator 11.50.1.1
remote network 1: 192.168.1.0/24
route 1: 192.168.1.0/24 through “pptp 1” (i also tested with direct ip 11.50.1.1)

from ping test works ok, but any LAN client in which i added the route: route add 192.168.1.0/24 10.10.10.16

doesn’t works, i torched the pptp interface and i see a ping return coming from remote network to the internal ip.

i’m not running any FW rules(this has to a be 100% transparent, at least in the outbound side).

i’m not sure what am i missing, some nat rule?