Hello,
I'm not sure about, is it true that only the response which has included
the "aa" in flags can be cached by client DNS Cache?
For example, for my domain, there are two queries below, the result for the
first query won't be cached, but the second will be cached, am I right?
$ dig mail.nsbeta.info ns @ns34.domaincontrol.com
; <<>> DiG 9.4.2-P2 <<>> mail.nsbeta.info ns @ns34.domaincontrol.com
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 12892
;; flags: qr rd; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 2
;; WARNING: recursion requested but not available
;; QUESTION SECTION:
;mail.nsbeta.info. IN NS
;; ANSWER SECTION:
mail.nsbeta.info. 1800 IN NS dwdns2.nsbeta.info.
mail.nsbeta.info. 1800 IN NS dwdns1.nsbeta.info.
;; ADDITIONAL SECTION:
dwdns2.nsbeta.info. 3600 IN A 219.129.239.5
dwdns1.nsbeta.info. 3600 IN A 120.132.133.48
--------------------------------------------------
$ dig mail.nsbeta.info ns @dwdns2.nsbeta.info
; <<>> DiG 9.4.2-P2 <<>> mail.nsbeta.info ns @dwdns2.nsbeta.info
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 28561
;; flags: qr aa rd; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0
;; WARNING: recursion requested but not available
;; QUESTION SECTION:
;mail.nsbeta.info. IN NS
;; ANSWER SECTION:
mail.nsbeta.info. 3600 IN NS dwdns1.nsbeta.info.
mail.nsbeta.info. 3600 IN NS dwdns2.nsbeta.info.
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