Hello to all of you,
I finally made it by reloading a 1.2.3 version, for info:
1: i used a Dell optiplex but i needed to put 2 "old" network-cards, the 1.2.3 cannot recognize the on-board one.
2: i had no problem with the LAN interface IP and the DHCP rule having a different range of IP addresses , still I dont why it's that way; i didn't set up that config, just took over (i dont think thats the right way to do it but its working).
I would like to thank everyone here: both reading and answering or helping others with issues.
Anyone in Denmark, beers are waiting!
s.