On 07/08/11 20:07, Feng He wrote:
Hello list,
$ dig www.qq.com ns @ns1.qq.com
;<<>> DiG 9.4.2-P2.1<<>> www.qq.com ns @ns1.qq.com
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 50734
;; flags: qr aa rd; QUERY: 1, ANSWER: 2, AUTHORITY: 4, ADDITIONAL: 0
;; WARNING: recursion requested but not available
;; QUESTION SECTION:
;www.qq.com. IN NS
;; ANSWER SECTION:
www.qq.com. 86400 IN NS ns-tel1.qq.com.
www.qq.com. 86400 IN NS ns-tel2.qq.com.
;; AUTHORITY SECTION:
qq.com. 86400 IN NS ns4.qq.com.
qq.com. 86400 IN NS ns1.qq.com.
qq.com. 86400 IN NS ns2.qq.com.
qq.com. 86400 IN NS ns3.qq.com.
;; Query time: 7 msec
;; SERVER: 219.133.62.252#53(219.133.62.252)
;; WHEN: Sat Jul 9 08:58:38 2011
;; MSG SIZE rcvd: 144
$ dig www.qq.com ns @ns-tel1.qq.com
;<<>> DiG 9.4.2-P2.1<<>> www.qq.com ns @ns-tel1.qq.com
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 44393
;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; WARNING: recursion requested but not available
;; QUESTION SECTION:
;www.qq.com. IN NS
;; AUTHORITY SECTION:
qq.com. 86400 IN SOA ns1.qq.com.
webmaster.qq.com. 1293074536 300 600 86400 86400
;; Query time: 7 msec
;; SERVER: 121.14.73.115#53(121.14.73.115)
;; WHEN: Sat Jul 9 08:59:07 2011
;; MSG SIZE rcvd: 78
I have two questions against the two dig info above.
First, why ns1.qq.com (which is the authority nameserver for the zone
of qq.com, not www.qq.com) returns the authority answer for
www.qq.com's NS query? and even includes a AA flag in the response.
qq.com zone is the parent to the subdomain www.qq.com, so it has to have
knowledge of the name servers for the www.qq.com subdomain. That is how
a recursive name server finds www.qq.com.
Second, why ns-tel1.qq.com (which is the authority nameserver for the
zone of www.qq.com) returns nothing for this zone's NS query?
Misconfiguration of ns-tel1.qq.com or it's not allowed to give you that
answer. Hard to tell from here.
The view from here does not show ns-tel1.qq.com to be authorative for
www.qq.com.
Lyle Giese
LCR Computer Services, Inc.
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