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I use DNS Jumper to test the speed of various DNS and this is the result:
(A) Currently Using
Primary: 203.144.207.29 (39 ms)
Secondary: 8.8.4.4 (71 ms)
(B) US Open DNS
Primary: 208.67.220.220 (315 ms)
Secondary: 208.67.222.222 (307 ms)
Theoretically I should stick to setting (A) as they are faster.
But when I use setting (A), access to www.taobao.com (a shopping site in mainland China) is extremely slow although still accessible. For other sites around the world they are fast.
I repeated my test many times and it seems that setting (B) is much faster ONLY for www.taobao.com .
I cannot understand this. Why is setting (B) faster than (A) when both DNS servers are not down. Isn't DNS just address-lookup? Why setting (B) gives me faster download when the DNS speed test is much slower?
Lawrence L.
Posted 2014-07-25T14:26:20.873
Reputation: 3
There are other DNS servers besides these that might needs to be queried, unless the DNS server has cached the result due to a previous query and the cache entry hasn't expired. These other DNS servers could be the cause. – Steve – 2014-07-25T15:21:22.963
Lawrence, where are you located? I agree with @Steve that there are a multitude of reasons you can get different results from different DNS servers. Caching is a big reason. For instance to really do a good test to compare those different DNS servers you would need to wait until all DNS servers (and your computer, and your router) have dropped it from their cache. – KingOfAllTrades – 2014-07-25T16:50:08.173
Thanks.
I am located in south Thailand.
Today I can access www.taobao.com (China) quite fast using setting (A).
Thanks for explaining. I just want to know the theory behind the unusual phenomenon. – Lawrence L. – 2014-07-26T08:53:41.070