[dns-operations] 答复: about answer status

[张在峰]

I think you can read this article https://engineering.opendns.com/2014/06/23/nxdomain-nodata-debugging-dns-dual-stacked-hosts/ and get the answer.

For RFC document, click: https://tools.ietf.org/html/rfc2308


-----邮件原件-----
发件人: dns-operations [mailto:dns-operations-bounces at dns-oarc.net] 代表 Kevin C.
发送时间: 2015年6月8日 16:12
收件人: dns-operations at dns-oarc.net
主题: [dns-operations] about answer status

Hello,

Sometime I got "NOERROR" from the answer, but sometime got "NXDOMAIN".
At what case the nameserver returns "NOERROR" or "NXDOMAIN" for a non-exist record? Thank you.

There are two digs below, please notice they are different hostnames.

$ dig defensor.game.yy.com @localhost

; <<>> DiG 9.6.1-P2 <<>> defensor.game.yy.com @localhost ;; global options: +cmd ;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 35846 ;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0 ;; WARNING: recursion requested but not available

;; QUESTION SECTION:
;defensor.game.yy.com.          IN      A

;; AUTHORITY SECTION:
game.yy.com.            600     IN      SOA     dwdns1.nsbeta.info. 
support.dnsbed.com. 150907 10800 3600 604800 600

;; Query time: 0 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Mon Jun  8 16:07:14 2015
;; MSG SIZE  rcvd: 107


$ dig defenser.game.yy.com @localhost

; <<>> DiG 9.6.1-P2 <<>> defenser.game.yy.com @localhost ;; global options: +cmd ;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 17567 ;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0 ;; WARNING: recursion requested but not available

;; QUESTION SECTION:
;defenser.game.yy.com.          IN      A

;; AUTHORITY SECTION:
game.yy.com.            600     IN      SOA     dwdns1.nsbeta.info. 
support.dnsbed.com. 150907 10800 3600 604800 600

;; Query time: 0 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Mon Jun  8 16:07:42 2015
;; MSG SIZE  rcvd: 107
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