Hi. I have a small domain lab set up at home, including DNS/DHCP on the Win2008 server. I'd like to be able to refer to my domain clients by name, but I find that I get a slowdown when using an internal DNS. Win DNS refers to my ISP's upstream dns (I also tried Google's DNS servers for a little while) but it feels like there's an extra couple seconds for each request when I'm using anything except the DNS servers fetched via DHCP from my ISP. I tried adding my local DNS to my router's DHCP (Need to use router to fetch DHCP info from ISP, even though none of it ever changes, since I'm behind NAT)

So, my question is:

Is there any way to set my internal DNS server to be secondary to a dynamically retrieved upstream DNS?

I want the internal server to be queried only if the ISP dns fails, or to be queried only for a certain TLD (.iv right now. I guess for best practices I should change it to .internal)