Answer for:

HOw to join wind 7 to 2003 AD domain without DNS server

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as the DNS suffix [as a helper (append DNS suffix) ] in the TPC/IP advanced DNS properties of the network card.

if in fact the ISP hosts your DNS server thus provides name resolution for your internal company domain, it should direct the DNS query for the IP address of your domain controller to your internal company domain controller thus allow authentication and joining the workstation to the domain.

If your ISP does not provide name resolution services for your internal company domain, then you have to find out what DNS server does. DNS simply is name resolution to IP address. when trying to join a domain, you use the domain name. If there is no DNS server which can say = IP address [of Domain controller] then the query will always fail because the workstation can not find the domain controller.