Hi khun Pot,
I have installed DHCP and DNS on your new server.
I have not enabled the DHCP scope, you can do that when you are ready to test.
I have set the servers DNS forwarders and root hints and it looks like it works OK.
I can ping intranet.houghtonglobal.com, hkhk-ap-dom01.ap.houghton ,rdp.houghton.com.au and rayongserver1.thaihoughton.com & google.com
If you need any assistance with testing or other configuration please ask.