Ensures the DNS is being resolved correctly As you probably know, the default DNS on router is your ISP’s DNS. Often ISPs block access to certain resources be resolving their site names to a “wrong” IP-address. For instance if ISP wants to block access to example.com their DNS would resolve example.com to 127.0.0.1 or another fake IP. To

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Don't use the local address of the DNS, which is most likely on your router. I was connecting to the DNS on my router, which for some unknown reason wasn't working with my server. Instead, I found out where the DNS on my router was getting its information from, and set dn – kyul Mar 11 '14 at 18:38

Change the IP address of the new DC to the IP address of the old one. Verify that the associated entries in DNS reflect the IP address change. Remove the temporary DNS IP address from the DHCP option 6 list and set your lease time to whatever is appropriate, like the default of 8 days. Linksys Official Support - Checking the DNS Servers on a