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Instead of relying on a few pings, run the test for yourself: http://code.google.com/p/namebench/

The Google DNS team built the tool above, and it allows you to test your current setup against a number of DNS vendors + allows you to share the data, etc.

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If I understand correctly, these are addressing two different issues. Namebench seems to be interested in finding out which DNS server will return a look up request the fastest. The OP though is saying that because global DNS providers don't currently pass along information about my local IP address, I'll get a suboptimal response that points to an IP address that may not be the fastest for me.

Or does namebench actually test the IP addresses you get in response to test their response time?

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