When I look at the log for Namebench, I only see response time. That seems to be the only metric for determining which DNS is better.
Here is my results:
http://i.imgur.com/ol1Ugt2.pngThe only thing that was enabled during this test was DNS Relay, not Automatic DNS Service (which was what slowed everything down). The DNS Relay address (Boxed in
blue) and the fasted DNS (Boxed in
green, which also happens to be my modem's default DNS, lead to the same WAN address.
I just did a test where I set the router's DNS to Google's DNS servers ( 8.8.8.8 ), then saved settings and did the required router reboot. Without changing any settings from my computer's automatic IP address settings, it was able to get the new DNS address when it reconnected. Setting the router back to 0.0.0.0, and rebooting it, changed my computer back to the Comcast DNS server. So any DNS changes can be propagated through the network, automatically, without even using DNS Relay. For anyone who uses DHCP only, which I assume is 99% of people out there, the DNS Relay offers no advantage I see. It's really silly for D-Link to have this enabled by default, as anyone running a network without DHCP must already know what they're doing and can enable it themselves.