Well, I have tried, and its not working neither xp or 7. In XP the error showed is "network path not found", but xp workstation can ping samba server to ip and to name. From windows 7 workstation, the error is different: cant contact with an Active Directory in the domain Ibertestint...????
Maybe I am wrong, but...its necessary to join the domain from the server itself with net rpc command? Maybe its a /etc/hosts wrong setup??