Okay i've taken the server home, so the configuration changed a little bit.
DCHP is not working now. I've put in the IP address myself, didn't get it from DHCP so i still can reach zentyal
Network
Interface (eth0) = internal. Don't ask me why it's 0 :p
So i made my internal NIC 192.168.3.1
Interface (eth1) = external. DHCP is still running on my ADSL modem, but i can't shut it down ISP disabled that option (don't know if it matters).
DNS
DNS pointing to local zentyal domain (127.0.0.1) & ADSL modem (192.168.2.254)
Gateway
Gateway is pointing to the ADSL modem (192.168.2.254)
DHCP
I filled in the search domain and a range.
DNSUsed some random domains
So there you have it folks. If anyone could be able to figure the problem it would be great