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悬空 CNAME 记录问题

tag-icon • tag-icon domain-name-system cname-record dkim amazon-ses
悬空 CNAME 记录问题

我一直尝试使用 Amazon SES 为我的一个子域设置 DKIM CNAME 签名，但由于某种原因，CNAME 行为异常：

例如。

下列：

dig @4.2.2.4 pznfjjljalcr5ocdaxrjia27nbf7cial._domainkey.support.formsdotstar.com

有时返回：

; <<>> DiG 9.8.3-P1 <<>> @4.2.2.4 pznfjjljalcr5ocdaxrjia27nbf7cial._domainkey.support.formsdotstar.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 10537
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;pznfjjljalcr5ocdaxrjia27nbf7cial._domainkey.support.formsdotstar.com. IN A

;; ANSWER SECTION:
pznfjjljalcr5ocdaxrjia27nbf7cial._domainkey.support.formsdotstar.com. 170 IN CNAME support.formsdotstar.com.
support.formsdotstar.com. 170   IN  A   23.239.84.67

;; Query time: 223 msec
;; SERVER: 4.2.2.4#53(4.2.2.4)
;; WHEN: Wed May 11 22:56:02 2016
;; MSG SIZE  rcvd: 116

其他时候则返回：

; <<>> DiG 9.8.3-P1 <<>> @4.2.2.4 pznfjjljalcr5ocdaxrjia27nbf7cial._domainkey.support.formsdotstar.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 31484
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;pznfjjljalcr5ocdaxrjia27nbf7cial._domainkey.support.formsdotstar.com. IN A

;; ANSWER SECTION:
pznfjjljalcr5ocdaxrjia27nbf7cial._domainkey.support.formsdotstar.com. 174 IN CNAME pznfjjljalcr5ocdaxrjia27nbf7cial.dkim.amazonses.com.

;; AUTHORITY SECTION:
dkim.amazonses.com. 774 IN  SOA ns-386.awsdns-48.com. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400

;; Query time: 232 msec
;; SERVER: 4.2.2.4#53(4.2.2.4)
;; WHEN: Wed May 11 22:56:01 2016
;; MSG SIZE  rcvd: 226

最初我以为这是一个传播问题，但它出现在同一个 DNS 服务器上。

可能出了什么问题？

答案1

formsdotstar.com 的四个名称服务器返回了不同的答案：

$ dig @ns1bqx.name.com pznfjjljalcr5ocdaxrjia27nbf7cial._domainkey.support.formsdotstar.com
;; ANSWER SECTION:
pznfjjljalcr5ocdaxrjia27nbf7cial._domainkey.support.formsdotstar.com. 300 IN CNAME pznfjjljalcr5ocdaxrjia27nbf7cial.dkim.amazonses.com.

dig @ns2dfg.name.com pznfjjljalcr5ocdaxrjia27nbf7cial._domainkey.support.formsdotstar.com
;; ANSWER SECTION:
pznfjjljalcr5ocdaxrjia27nbf7cial._domainkey.support.formsdotstar.com. 300 IN CNAME support.formsdotstar.com.
support.formsdotstar.com. 300   IN  A   23.239.84.67

$ dig @ns3dkz.name.com pznfjjljalcr5ocdaxrjia27nbf7cial._domainkey.support.formsdotstar.com
;; ANSWER SECTION:
pznfjjljalcr5ocdaxrjia27nbf7cial._domainkey.support.formsdotstar.com. 300 IN CNAME pznfjjljalcr5ocdaxrjia27nbf7cial.dkim.amazonses.com.

$ dig @ns4ghm.name.com pznfjjljalcr5ocdaxrjia27nbf7cial._domainkey.support.formsdotstar.com
;; ANSWER SECTION:
pznfjjljalcr5ocdaxrjia27nbf7cial._domainkey.support.formsdotstar.com. 300 IN CNAME support.formsdotstar.com.
support.formsdotstar.com. 300   IN  A   23.239.84.67

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