On Thu, 3 Dec 2009, Seth Mattinen wrote:
Jorge Amodio wrote:
now Google DNS, anything more?
I'm surprised that Google's new DNS service does not return better results for google.com than some local DNS resolvers do. My server is in Fairfax, VA. Does Google use Anycast'ed IPs or is it still a hybrid of split-horizon DNS and other things, as discussed previously: http://www.merit.edu/mail.archives/nanog/2009-02/threads.html#00269 Here's the results from some various DNS servers for Google.com. I thought Google had a datacenter in Ashburn, VA, but I'm not getting there. Maybe it's gone. Maybe the shortest route doesn't matter anymore. --> dig +short google.com @208.67.222.222 # OpenDNS 74.125.53.100 74.125.67.100 74.125.45.100 --> dig +short google.com @8.8.8.8 # Google DNS 74.125.67.100 74.125.53.100 74.125.45.100 --> dig +short google.com @8.8.4.4 # Google DNS 2 74.125.67.100 74.125.53.100 74.125.45.100 --> dig +short google.com @198.6.1.1 # UUNET/Verizon Cache server (cache00.ns.uu.net) 74.125.53.100 74.125.67.100 74.125.45.100 --> dig +short google.com @198.6.1.2 74.125.45.100 74.125.53.100 74.125.67.100 --> dig +short google.com @198.6.1.3 74.125.45.100 74.125.67.100 74.125.53.100 --> dig +short google.com @198.6.1.4 74.125.45.100 74.125.53.100 74.125.67.100 --> dig +short google.com @198.6.1.5 74.125.67.100 74.125.45.100 74.125.53.100 * --> dig +short google.com @70.164.18.41 # Nova.org (Small VA ISP) Caching DNS 74.125.45.100 74.125.53.100 74.125.67.100 * --> dig +short google.com @208.94.147.150 # Tiggee DNS (VA company) 74.125.45.100 74.125.67.100 74.125.53.100 --> ping -c 10 74.125.45.100 10 packets transmitted, 10 packets received, 0% packet loss round-trip min/avg/max/stddev = 18.079/20.522/25.272/2.200 ms --> ping -c 10 74.125.53.100 10 packets transmitted, 10 packets received, 0% packet loss round-trip min/avg/max/stddev = 97.721/101.267/107.770/2.856 ms --> ping -c 10 74.125.67.100 10 packets transmitted, 10 packets received, 0% packet loss round-trip min/avg/max/stddev = 97.531/99.238/101.206/1.420 ms Only the last two starred DNS records returned what _seems_ to be the best result for Google.com. Then again, someone from Google might be able to explain the logic behind the results. And to rip off the bandaid on the "What DNS Is Not" discussion, Google's DNS does return the expected NXDOMAIN for the very small test I did. --------------------------------------------------------------------------- Peter Beckman Internet Guy beckman@angryox.com http://www.angryox.com/ ---------------------------------------------------------------------------