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

[Davey Song(宋林健)]

It's OK. But if the authoritative server like .cn and .com can response with
different answers according to the geo-location of resolver(or Client Subnet
information), it is not odd to see different NS RRset from different
location. 

-Davey
-----邮件原件-----
发件人: Robert [mailto:support at cloudwebdns.com] 
发送时间: 2016年4月20日 10:06
收件人: Davey Song(宋林健); dns-operations at dns-oarc.net
主题: Re: 答复: [dns-operations] strange policy on amazon DNS setting

sorry, you are right.
I have misoperated it for one is kindle.cn, another is amazon.cn.
Thanks.


On 2016/4/20 星期三 10:02, Davey Song(宋林健) wrote:
> 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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