[dns-operations] 答复: strange policy on amazon DNS setting

[Davey Song(宋林健)]

In China if you dig NS kindle.cn you got only one NS RR as well. 

;; ANSWER SECTION:
kindle.cn.		899	IN	NS	u2.amazon.com.

-Davey
-----邮件原件-----
发件人: dns-operations [mailto:dns-operations-bounces at dns-oarc.net] 代表
Robert
发送时间: 2016年4月20日 9:31
收件人: dns-operations at dns-oarc.net
主题: [dns-operations] strange policy on amazon DNS setting

Hi,

 From a host within China I got the NS records for amazon.cn,

amazon.cn.              499     IN      NS      ns4.p31.dynect.net.
amazon.cn.              499     IN      NS      ns1.p31.dynect.net.
amazon.cn.              499     IN      NS      u2.amazon.com.
amazon.cn.              499     IN      NS      ns1.dynect.cn.
amazon.cn.              499     IN      NS      ns2.dynect.net.cn.
amazon.cn.              499     IN      NS      ns2.dynect.cn.
amazon.cn.              499     IN      NS      u5.amazon.cn.
amazon.cn.              499     IN      NS      ns2.p31.dynect.net.
amazon.cn.              499     IN      NS      ns3.p31.dynect.net.
amazon.cn.              499     IN      NS      ns1.dynect.net.cn.

But from a host out of China (the US) I got the results,

kindle.cn.              900     IN      NS      u2.amazon.com.

(only one NS RR)

How and why does amazon's DNS setting behave as this? Thanks.

robert.
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