Jason425 is absolutely right. To find out what your preferred DNS server is, first change the settings to how they were before. Then, when your internet access is restored to normal, go to:
Start > Run > type "command.com" (no quotes) > press ENTER > type "ipconfig /all" (again no quotes)
The information needed should be displayed. Then go back and forward your ports again, this time with the DNS servers, too.
Also, what settings are you using to forward ports? From what you are talking about (preferred DNS server) it sounds like you are trying to have the router act as the DNS proxy instead of your ISP. I would suggest changing the DNS Relay Selection to Disabled, so that the ISP will determine the DNS servers.
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