After recalling the recent episode where queries to Net Nod's instance of the i root were intercepted and tampered with resulting in incorrect responses being returned inside and outside of China for facebook.com and other websites, Larson posed the question whether others were having similar experiences. (NB: Net Nod's i-root server instance in Beijing is still shut down, as their CEO has apparently stated it is not possible to offer authoritative root service in China) Unfortunately, several of the managed DNS services providers answered affirmatively.
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The extent of DNS services being blocked in China
Posted: May 21st, 2010, 10:23pm UTC by Brenden Kuerbis
The most recent episode of The Ask Mr. DNS Podcast offers up some disturbing corroborating evidence as to the extent of DNS filtering and outright blocking occurring in China. VeriSign's Matt Larson and InfoBlox's Cricket Liu, who co-host the geeky yet engaging and extremely informative show, held a roundtable discussion including technical experts from dynamic name service providers (better known as "managed DNS" services) DynDNS, TZO, No-IP, and DotQuad, as well as Google and Comcast.