I have been tasked with creating a two-way trust relationship between our company (ABC.com with a Windows Server 2003 forest functional level) and our parent company (123.com with a Windows 2000 forest functional level). Of course management wants this done yesterday. We first plan on establishing a site-to-site VPN prior to creating the trust relationship and it seems as though our best, if not only, option would be to create an external trust between the two domains. My main concern is how to properly setup DNS between the two domains. I have read up a little on Secondary Zones, Stub Zones and Conditional Forwarders, but not entirely sure when to use each one and which would be the proper way of setting it up in this situation. Any help would be greatly appreciated.