[dns-operations] aws.amazon.com zone has only one nameserver

[Yonghua Peng]

Mark is exactly right. thanks.

On 2015/12/8 星期二 20:58, Mark Jeftovic wrote:
> I believe this is the entire set:
>
> $ dig +trace aws.amazon.com
>
> [snip]
>
> aws.amazon.com.         7200    IN      NS      ns-932.amazon.com.
> aws.amazon.com.         7200    IN      NS      ns-923.amazon.com.
> aws.amazon.com.         7200    IN      NS      ns-931.amazon.com.
> aws.amazon.com.         7200    IN      NS      ns-912.amazon.com.
> aws.amazon.com.         7200    IN      NS      ns-921.amazon.com.
> aws.amazon.com.         7200    IN      NS      ns-911.amazon.com.
> ;; Received 261 bytes from 204.74.108.1#53(pdns1.ultradns.net) in 170 ms
>
>
> but each nameserver is only returning it's own RR (I think)
>
> - mark
>
> On 2015-12-08 7:35 AM, Valentin Bud wrote:
>> Hello Yonghua,
>>
>> Fom where I am standing (.ro) things look differently, as it follows.
>>
>>   ~$ dig +short aws.amazon.com <http://aws.amazon.com> ns in
>> ns-932.amazon.com <http://ns-932.amazon.com>.
>>
>> ~$ dig +short ns-932.amazon.com <http://ns-932.amazon.com>. a in
>> 52.16.221.207
>>
>> I guess that Amazon has geo aware DNS configuration in place.
>>
>> Also I can find the A IN for ns-911.amazon.com
>> <http://ns-911.amazon.com/> and it matches yours.
>>
>> ~$ dig +short ns-911.amazon.com <http://ns-911.amazon.com>. a in
>> 207.171.178.6
>>
>> Best,
>> Valentin
>>
>> On Tue, Dec 8, 2015 at 2:10 PM Yonghua Peng <pyh at cloud-china.org
>> <mailto:pyh at cloud-china.org>> wrote:
>>
>>      Hi,
>>
>>      As you see,
>>
>>      ~$ idig aws.amazon.com <http://aws.amazon.com> ns
>>      aws.amazon.com <http://aws.amazon.com>.         587     IN      NS
>>          ns-911.amazon.com <http://ns-911.amazon.com>.
>>
>>      ~$ idig aws.amazon.com <http://aws.amazon.com> soa
>>      aws.amazon.com <http://aws.amazon.com>.         60      IN      SOA
>>         ns-911.amazon.com <http://ns-911.amazon.com>.
>>      root.amazon.com <http://root.amazon.com>. 1449536989 3600 900 7776000 60
>>
>>      ~$ idig ns-911.amazon.com <http://ns-911.amazon.com>
>>      ns-911.amazon.com <http://ns-911.amazon.com>.      197     IN
>>      A       207.171.178.6
>>
>>      Do you know why this well known domain has only one nameserver, and it
>>      seems the nameserver has only one IP?
>>
>>      Thx.
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>