Hi Ernest, thanks for the reply.
Following some screenshot for my current router configuration:
L2TP Server config:
and Firewall zones:
I also have choosen L2TP range IP from 0.250 to 0.253 for DHCP in order not to go in conflict with normal DHCP (from 190 to 199).
All configurations seem to be OK. By th way I cannot ping anything except 192.168.0.1. Also ping command reports that "destination PORT is unreachable" (pls note the word PORT instead of HOST)
Thanks in advance for the help.